{"id":576,"date":"2015-11-07T19:35:01","date_gmt":"2015-11-08T04:35:01","guid":{"rendered":"\/blog\/?p=576"},"modified":"2025-12-09T14:57:15","modified_gmt":"2025-12-09T05:57:15","slug":"unix-shell-programming","status":"publish","type":"post","link":"https:\/\/hasu0707.duckdns.org\/blog\/?p=576","title":{"rendered":"UNIX Shell Programming"},"content":{"rendered":"\n
#############################
# \uc624\ub958 \ubc1c\uc0dd \uc2dc \uc2a4\ud06c\ub9bd\ud2b8 \uc2e4\ud589
# \uc911\uc9c0 \ub610\ub294 \ubb34\uc2dc\ud558\uace0 \uc9c4\ud589
#############################
set -e
set +e

#############################
# \ubcc0\uc218 \uc0ac\uc6a9 \ubc29\ubc95 (Variable)
#############################
\u25a3 \uc704\uce58 \ub9e4\uac1c \ubcc0\uc218(Positional Parameters)
$0 : \uc2e4\ud589\ub41c \uc2a4\ud06c\ub9bd\ud2b8 \uc774\ub984
$1 : $1 $2 $3...${10}\uc778\uc790 \uc21c\uc11c\ub300\ub85c \ubc88\ud638\uac00 \ubd80\uc5ec\ub41c\ub2e4. 10\ubc88\uc9f8\ubd80\ud130\ub294 \"{}\"\uac10\uc2f8\uc918\uc57c \ud568
$* : \uc804\uccb4 \uc778\uc790 \uac12
$@ : \uc804\uccb4 \uc778\uc790 \uac12($* \ub3d9\uc77c\ud558\uc9c0\ub9cc \uc30d\ub530\uc634\ud45c\ub85c \ubcc0\uc218\ub97c \uac10\uc2f8\uba74 \ub2e4\ub978 \uacb0\uacfc \ub098\uc634)
$# : \ub9e4\uac1c \ubcc0\uc218\uc758 \ucd1d \uac1c\uc218

\u25a3 \ud2b9\uc218 \ub9e4\uac1c \ubcc0\uc218(Special Parameters)
$$ : \ud604\uc7ac \uc2a4\ud06c\ub9bd\ud2b8\uc758 PID
$? : \ucd5c\uadfc\uc5d0 \uc2e4\ud589\ub41c \uba85\ub839\uc5b4, \ud568\uc218, \uc2a4\ud06c\ub9bd\ud2b8 \uc790\uc2dd\uc758 \uc885\ub8cc \uc0c1\ud0dc
$! : \ucd5c\uadfc\uc5d0 \uc2e4\ud589\ud55c \ubc31\uadf8\ub77c\uc6b4\ub4dc(\ube44\ub3d9\uae30) \uba85\ub839\uc758 PID
$- : \ud604\uc7ac \uc635\uc158 \ud50c\ub798\uadf8
$_ : \uc9c0\ub09c \uba85\ub839\uc758 \ub9c8\uc9c0\ub9c9 \uc778\uc790\ub85c \uc124\uc815\ub41c \ud2b9\uc218 \ubcc0\uc218

\u25a3 \ub9e4\uac1c \ubcc0\uc218 \ud655\uc7a5(Parameter Expansion)
${\ubcc0\uc218} : $\ubcc0\uc218\uc640 \ub3d9\uc77c\ud558\uc9c0\ub9cc {} \uc0ac\uc6a9\ud574\uc57c\ub9cc \ub3d9\uc791\ud558\ub294 \uac83\ub4e4\uc774 \uc788\uc74c(\uc608: echo ${string})
${\ubcc0\uc218:\uc704\uce58} : \uc704\uce58 \ub2e4\uc74c\ubd80\ud130 \ubb38\uc790\uc5f4 \ucd94\ucd9c(\uc608: echo ${string:4})
${\ubcc0\uc218:\uc704\uce58:\uae38\uc774} : \uc704\uce58 \ub2e4\uc74c\ubd80\ud130 \uc9c0\uc815\ud55c \uae38\uc774 \ub9cc\ud07c\uc758 \ubb38\uc790\uc5f4 \ucd94\ucd9c(\uc608: echo ${string:4:3})
${\ubcc0\uc218:-\ub2e8\uc5b4} : \ubcc0\uc218 \ubbf8\uc120\uc5b8 \ud639\uc740 NULL\uc77c\ub54c \uae30\ubcf8\uac12 \uc9c0\uc815, \uc704\uce58 \ub9e4\uac1c \ubcc0\uc218\ub294 \uc0ac\uc6a9 \ubd88\uac00(\uc608: echo ${string:-HELLO})
${\ubcc0\uc218-\ub2e8\uc5b4}  : \ubcc0\uc218 \ubbf8\uc120\uc5b8\uc2dc\ub9cc \uae30\ubcf8\uac12 \uc9c0\uc815, \uc704\uce58 \ub9e4\uac1c \ubcc0\uc218\ub294 \uc0ac\uc6a9 \ubd88\uac00(\uc608: echo ${string-HELLO})
${\ubcc0\uc218:=\ub2e8\uc5b4} : \ubcc0\uc218 \ubbf8\uc120\uc5b8 \ud639\uc740 NULL\uc77c\ub54c \uae30\ubcf8\uac12 \uc9c0\uc815, \uc704\uce58 \ub9e4\uac1c \ubcc0\uc218 \uc0ac\uc6a9 \uac00\ub2a5(\uc608: echo ${string:=HELLO})
${\ubcc0\uc218=\ub2e8\uc5b4}  : \ubcc0\uc218 \ubbf8\uc120\uc5b8\uc2dc\ub9cc \uae30\ubcf8\uac12 \uc9c0\uc815, \uc704\uce58 \ub9e4\uac1c \ubcc0\uc218 \uc0ac\uc6a9 \uac00\ub2a5(\uc608: echo ${string=HELLO})
${\ubcc0\uc218:?\ub2e8\uc5b4} : \ubcc0\uc218 \ubbf8\uc120\uc5b8 \ud639\uc740 NULL\uc77c\ub54c \ub2e8\uc5b4 \ucd9c\ub825 \ud6c4 \uc2a4\ud06c\ub9bd\ud2b8 \uc885\ub8cc,(\uc608: echo ${string:?HELLO})
${\ubcc0\uc218?\ub2e8\uc5b4}  : \ubcc0\uc218 \ubbf8\uc120\uc5b8\uc2dc\ub9cc \ub2e8\uc5b4 \ucd9c\ub825 \ud6c4 \uc2a4\ud06c\ub9bd\ud2b8 \uc885\ub8cc(\uc608: echo ${string?HELLO})
${\ubcc0\uc218:+\ub2e8\uc5b4} : \ubcc0\uc218 \uc120\uc5b8\uc2dc\ub9cc \ub2e8\uc5b4 \uc0ac\uc6a9(\uc608: echo ${string:+HELLO})
${\ubcc0\uc218+\ub2e8\uc5b4}  : \ubcc0\uc218 \uc120\uc5b8 \ud639\uc740 NULL\uc77c\ub54c \ub2e8\uc5b4 \uc0ac\uc6a9(\uc608: echo ${string+HELLO})
${#\ubcc0\uc218}      : \ubb38\uc790\uc5f4 \uae38\uc774(\uc608: echo ${#string})
${\ubcc0\uc218#\ub2e8\uc5b4}  : \ubcc0\uc218\uc758 \uc55e\ubd80\ubd84\ubd80\ud130 \uc9e7\uac8c \uc77c\uce58\ud55c \ub2e8\uc5b4 \uc0ad\uc81c(\uc608: echo ${string#a*b})
${\ubcc0\uc218##\ub2e8\uc5b4} : \ubcc0\uc218\uc758 \uc55e\ubd80\ubd84\ubd80\ud130 \uae38\uac8c \uc77c\uce58\ud55c \ub2e8\uc5b4 \uc0ad\uc81c(\uc608: echo ${string##a*b})
${\ubcc0\uc218%\ub2e8\uc5b4}  : \ubcc0\uc218\uc758 \ub4b7\ubd80\ubd84\ubd80\ud130 \uc9e7\uac8c \uc77c\uce58\ud55c \ub2e8\uc5b4 \uc0ad\uc81c(\uc608: echo ${string%b*c})
${\ubcc0\uc218%%\ub2e8\uc5b4} : \ubcc0\uc218\uc758 \ub4b7\ubd80\ubd84\ubd80\ud130 \uae38\uac8c \uc77c\uce58\ud55c \ub2e8\uc5b4 \uc0ad\uc81c(\uc608: echo ${string%%b*c})
${\ubcc0\uc218\/\ucc3e\ub294\ub2e8\uc5b4\/\ubcc0\uacbd\ub2e8\uc5b4}  : \ucc98\uc74c \uc77c\uce58\ud55c \ub2e8\uc5b4\ub97c \ubcc0\uacbd(\uc608: echo ${string\/abc\/HELLO})
${\ubcc0\uc218\/\/\ucc3e\ub294\ub2e8\uc5b4\/\ubcc0\uacbd\ub2e8\uc5b4} : \uc77c\uce58\ud558\ub294 \ubaa8\ub4e0 \ub2e8\uc5b4\ub97c \ubcc0\uacbd(\uc608: echo ${string\/\/abc\/HELLO})
${\ubcc0\uc218\/#\ucc3e\ub294\ub2e8\uc5b4\/\ubcc0\uacbd\ub2e8\uc5b4} : \uc55e\ubd80\ubd84\uc774 \uc77c\uce58\ud558\uba74 \ubcc0\uacbd(\uc608: echo ${string\/#abc\/HELLO})
${\ubcc0\uc218\/%\ucc3e\ub294\ub2e8\uc5b4\/\ubcc0\uacbd\ub2e8\uc5b4} : \ub4b7\ubd80\ubd84\uc774 \uc77c\uce58\ud558\uba74 \ubcc0\uacbd(\uc608: echo ${string\/%abc\/HELLO})
${!\ub2e8\uc5b4*}, ${!\ub2e8\uc5b4@} : \uc120\uc5b8\ub41c \ubcc0\uc218\uc911\uc5d0\uc11c \ub2e8\uc5b4\uac00 \ud3ec\ud568\ub41c \ubcc0\uc218 \uba85 \ucd94\ucd9c(\uc608: echo ${!string*}, echo ${!string@})

#############################
# \uc778\uc218 \ucc98\ub9ac
# \uc778\uc218\uac00 2\uac1c \ubbf8\ub9cc\uc774\uba74 \uc624\ub958 \ucc98\ub9ac
##############################
if [ $# -ne 2 ]; then
  echo \"Usage: $0 <param1> <param2>\"
  exit -1
else
  echo \"param1: $1\"
  echo \"param2: $2\"
fi

#############################
# \ud14d\uc2a4\ud2b8 \ud30c\uc77c\uc5d0\uc11c
# \uc911\ubcf5\ub41c \uc904\ub9cc \ucc3e\uae30
#############################
sort mapping.txt | uniq -d

#############################
# \ubcc0\uc218 \ub0b4\uc5d0 \ubb38\uc790\uc5f4 \uc874\uc7ac \uccb4\ud06c
#############################
AA=\"sftp,telnet\"

if [[ \"${AA}\" = *\"tel\"* ]]; then
 echo found.
fi

#############################
# \uc9c8\ubb38
#############################
while true; do
  echo
  read -p \"\uc774 \uc791\uc5c5\uc744 \uc815\ub9d0 \uc9c4\ud589\ud558\uc2dc\uaca0\uc2b5\ub2c8\uae4c? (y\/n) \" YN_ANSWER
    case ${YN_ANSWER} in
      [Yy]* ) break;;
      [Nn]* ) exit 1;;
      * ) echo \"Please answer y or n.\";;
  esac
done

#############################
# \uc2a4\ud06c\ub9bd\ud2b8\uc5d0\uc11c \uc124\uc815\ud30c\uc77c \uc77d\uae30
#############################
THIS_IS_CONFIG_FILE=\".\/init.conf\"
echo \"###########################################################\"
echo \"# Read the ${THIS_IS_CONFIG_FILE} file...\"
echo \"###########################################################\"
if [ -f ${THIS_IS_CONFIG_FILE} ]; then
  source ${THIS_IS_CONFIG_FILE}
else
  echo \"${THIS_IS_CONFIG_FILE} can't be read.\"
  exit 1
fi

echo ${TIMESTAMP_STR}
----------------------------------
\u25a3\u25a3\u25a3 init.conf \u25a3\u25a3\u25a3
TIMESTAMP_STR=`date \"+%Y%m%d_%H%M%S\"`
CURRENT_DIR=`pwd -P`

#############################
# PAUSE
#############################
read -p \"Press any key to continue...\"
read -t 5 -p \"I am going to wait for 5 seconds only...\"

#############################
# \uba85\ub839\uc5b4 \uc2e4\ud589 \uc131\uacf5\uc5ec\ubd80 \ud655\uc778
#############################
grep \"${USER_ID}\" \/etc\/sudoers
if [ $? -eq 0 ];
then
  echo \"\ubb38\uc790\uc5f4\uc774 \uc874\uc7ac \ud569\ub2c8\ub2e4.\"
else
  echo \"\ubb38\uc790\uc5f4\uc774 \uc874\uc7ac\ud558\uc9c0 \uc54a\uc2b5\ub2c8\ub2e4.\"
fi

#############################
# \ud30c\uc77c\uba85\uc744 \uc815\ub82c\ud558\uc5ec
# \ucd5c\uc2e0 \ud30c\uc77c\uc758 \ud30c\uc77c\uba85 \ucd94\ucd9c
#############################
TMP_FILENAME1=`ls -1 -t \/backup\/*_backup.tar.gz | head -1`
FILENAME_TAR_GZ=`basename ${TMP_FILENAME1}`

#############################
# \ubb38\uc790\uc5f4 \ubd84\ub9ac \ubc0f \ud30c\uc2f1
#############################
#!\/bin\/bash
TEXT_FILE=\"1.txt\"

#-----------------------------------------------
# \ubb38\uc790\uc5f4\uc774 \ud3ec\ud568\ub418\uc5c8\ub294\uc9c0 \ud655\uc778 (\uc788\uc73c\uba741, \uc5c6\uc73c\uba740)
#-----------------------------------------------
func_strstr() {
  [ \"${1#*$2*}\" = \"$1\" ] && return 0
  return 1
}

while read READ_STRING
do
  #---------------------------------------------
  # ;\uc744 \ubd84\ub9ac\uc790\ub85c \ud1a0\ud070 \ubd84\ub9ac
  #---------------------------------------------
  TOKENARR1=(${READ_STRING\/\/;\/ })

  TOKEN0=${TOKENARR1[0]}
  TOKEN1=${TOKENARR1[1]}
  TOKEN2=${TOKENARR1[2]}

  if [ ${TOKEN0} == \"-\" ]
  then
    TOKEN0=${OLD_TOKEN0}
  fi
  if [ ${TOKEN1} == \"-\" ]
  then
    TOKEN1=${OLD_TOKEN1}
  fi

  #---------------------------------------------
  # TOKEN2\uc5d0 ,\uac00 \ud3ec\ud568\ub418\uc5b4 \uc788\uc73c\uba74 \ub2e4\uc2dc \ud1a0\ud070 \ubd84\ub9ac
  # \ud6c4 \ucc98\ub9ac
  #---------------------------------------------
  func_strstr ${TOKEN2} \",\"
  if [ $? -eq 1 ];
  then
    TOKENARR2=(${TOKEN2\/\/,\/ })

    COUNT2=0
    while [ ! -z ${TOKENARR2[${COUNT2}]} ]
    do
      echo \"COMMA: ${TOKEN0} ; ${TOKEN1} ; ${TOKENARR2[${COUNT2}]}\"
      COUNT2=$(($COUNT2+1))
    done
  else
    echo \"${TOKEN0} ; ${TOKEN1} ; ${TOKEN2}\"
  fi

  OLD_TOKEN0=${TOKEN0}
  OLD_TOKEN1=${TOKEN1}
done < ${TEXT_FILE}

#############################
# \ubc30\uc5f4 \uc0ac\uc6a9 \uc608\uc81c (1\ucc28\uc6d0 \ubc30\uc5f4\ub9cc \uc9c0\uc6d0)
#############################
# \ubc30\uc5f4 \ubcc0\uc218 \uc0ac\uc6a9\uc740 \ubc18\ub4dc\uc2dc \uad04\ud638\ub97c \uc0ac\uc6a9\ud574\uc57c \ud55c\ub2e4.(\uc608: ${array[1]})
# \ubc30\uc5f4\uc758 \ud06c\uae30 \uc9c0\uc815\uc5c6\uc774 \ubc30\uc5f4 \ubcc0\uc218\ub85c \uc120\uc5b8
# \ucc38\uace0: 'declare -a' \uba85\ub839\uc73c\ub85c \uc120\uc5b8\ud558\uc9c0 \uc54a\uc544\ub3c4 \ubc30\uc5f4 \ubcc0\uc218 \uc0ac\uc6a9 \uac00\ub2a5\ud568
declare -a array

# 4\uac1c\uc758 \ubc30\uc5f4 \uac12 \uc9c0\uc815
array=(\"hello\" \"test\" \"array\" \"world\")

# \uae30\uc874 \ubc30\uc5f4\uc5d0 1\uac1c\uc758 \ubc30\uc5f4 \uac12 \ucd94\uac00(\uc21c\ucc28\uc801\uc73c\ub85c \uc785\ub825\ud560 \ud544\uc694 \uc5c6\uc74c)
array[4]=\"variable\"

# \uae30\uc874 \ubc30\uc5f4 \uc804\uccb4\uc5d0 1\uac1c\uc758 \ubc30\uc5f4 \uac12\uc744 \ucd94\uac00\ud558\uc5ec \ubc30\uc5f4 \uc800\uc7a5(\ubc30\uc5f4 \ubcf5\uc0ac \uc2dc \uc0ac\uc6a9)
array=(${array[@]} \"string\")

# \ubc30\uc5f4 \ub8e8\ud551, ${loop1}\uc774 \ubc30\uc5f4\uac12
for loop1 in \"${array[@]}\"
do
  echo ${loop1}
done

# \uc704\uc5d0\uc11c \uc9c0\uc815\ud55c \ubc30\uc5f4 \ucd9c\ub825
echo \"hello world \ucd9c\ub825: ${array[0]} ${array[3]}\"
echo \"\ubc30\uc5f4 \uc804\uccb4 \ucd9c\ub825: ${array[@]}\"
echo \"\ubc30\uc5f4 \uc804\uccb4 \uac1c\uc218 \ucd9c\ub825: ${#array[@]}\"

printf \"\ubc30\uc5f4 \ucd9c\ub825: %s\\n\" ${array[@]}

# \ubc30\uc5f4 \ud2b9\uc815 \uc694\uc18c\ub9cc \uc9c0\uc6b0\uae30
unset array[4]
echo \"\ubc30\uc5f4 \uc804\uccb4 \ucd9c\ub825: ${array[@]}\"

# \ubc30\uc5f4 \uc804\uccb4 \uc9c0\uc6b0\uae30
unset array
echo \"\ubc30\uc5f4 \uc804\uccb4 \ucd9c\ub825: ${array[@]}\"

#############################
# \ud568\uc218 \uc0ac\uc6a9 \uc608\uc81c (Function)
#############################
string_test1() {
  echo \"string test 1\"
}

string_test2() {
  echo \"string test 2\"
  echo \"\uac1c\ubcc4 \uc778\uc218: ${1} ${2} ${3} ${4}\"
  echo \"\uc804\uccb4 \uc778\uc218: ${@}\"
}
string_test1
string_test2 \"param-1\" \"param 2\" \"param_3\" \"param 4\"

#############################
# \ud14d\uc2a4\ud2b8 \ud30c\uc77c \uc77d\uae30
#############################
while read READ_STRING
do
  STRLEN=`echo -n $READ_STRING | wc -c`
  if [ ${STRLEN=} -gt 20 ]
  then
    echo ${READ_STRING}
  fi
done < ${TEXT_FILE}

#############################
# case\ubb38 \uc608\uc81c
#############################
case \"$1\" in
  \"start\")
    func_start
    ;;
  \"stop\")
    func_stop
    ;;
  \"status\")
    status anacron
    ;;
  \"restart\")
    func_stop
    func_start
    ;;
  \"condrestart\")
    if test \"x`pidof anacron`\" != x; then
      stop
      start
    fi
    ;;
  *)
    echo $\"Usage: $0 {start|stop|restart|condrestart|status}\"
    exit 1
esac

#############################
# if\ubb38 \uc608\uc81c
#############################
if [ conditons ]
then
  \uc870\uac74 \ub9cc\uc871\uc2dc \uc2e4\ud589\ud558\uace0\uc790 \ud558\ub294 \ubb38\uc7a5
elif [ conditons ]
  \ub450\ubc88\uc9f8 \uc870\uac74 \ub9cc\uc871\uc2dc \uc2e4\ud589 \ubb38\uc7a5
else
  \uc870\uac74 \ubd88\ub9cc\uc871\uc2dc \uc2e4\ud589\ud558\uace0\uc790 \ud558\ub294 \ubb38\uc7a5
fi

if [ $1 -gt 100 ]
then
  echo Hey that\\'s a large number.
  pwd
fi

if [ ${value} -eq 0 ]; then
  echo value is 0
fi

if [ ${test} -gt 2 -a ${test} -le 7 ]
then
  echo test greater then 2 and lower then 7
fi

if [ \"$opt\" == 'test' ] || [ \"$opt\" == 'aaa' ]
then
  echo the value is ...
fi

[ -z ] : \ubb38\uc790\uc5f4\uc758 \uae38\uc774\uac00 0\uc774\uba74 \ucc38
[ -n ] : \ubb38\uc790\uc5f4\uc758 \uae38\uc774\uac00 0\uc774 \uc544\ub2c8\uba74 \ucc38
[ string ] : \ubb38\uc790\uc5f4\uc774 NULL\uc774 \uc544\ub2c8\uba74 \ucc38
[ string1 = string2 ] : \ubb38\uc790\uc5f4\uc774 \ub3d9\uc77c\ud558\uba74 \ucc38
[ string1 != string2 ] : \ubb38\uc790\uc5f4\uc774 \ub2e4\ub974\uba74 \ucc38
[ -eq ] : \uac12\uc774 \uac19\uc73c\uba74 \ucc38
[ -ne ] : \uac12\uc774 \ub2e4\ub974\uba74 \ucc38
[ -gt ] : \uac121 > \uac122
[ -ge ] : \uac121 >= \uac122
[ -lt ] : \uac121 < \uac122
[ -le ] : \uac121 <= \uac122
[ -a ] : &&\uc5f0\uc0b0\uacfc \ub3d9\uc77c and \uc5f0\uc0b0
[ -o ] : ||\uc5f0\uc0b0\uacfc \ub3d9\uc77c or \uc5f0\uc0b0
[ -d ] : \ud30c\uc77c\uc774 \ub514\ub809\ud1a0\ub9ac\uba74 \ucc38
[ -e ] : \ud30c\uc77c\uc774 \uc788\uc73c\uba74 \ucc38
[ -L ] : \ud30c\uc77c\uc774 \uc2ec\ubcfc\ub9ad \ub9c1\ud06c\uba74 \ucc38
[ -r ] : \ud30c\uc77c\uc774 \uc77d\uae30 \uac00\ub2a5\ud558\uba74 \ucc38
[ -s ] : \ud30c\uc77c\uc758 \ud06c\uae30\uac00 0 \ubcf4\ub2e4 \ud06c\uba74 \ucc38
[ -w ] : \ud30c\uc77c\uc774 \uc4f0\uae30 \uac00\ub2a5\ud558\uba74 \ucc38
[ -x ] : \ud30c\uc77c\uc774 \uc2e4\ud589 \uac00\ub2a5\ud558\uba74 \ucc38
[ \ud30c\uc77c1 -nt \ud30c\uc77c2 ] : \ud30c\uc77c1\uc774 \ud30c\uc77c2\ubcf4\ub2e4 \ucd5c\uc2e0\ud30c\uc77c\uc774\uba74 \ucc38
[ \ud30c\uc77c1 -ot \ud30c\uc77c2 ] : \ud30c\uc77c1\uc774 \ud30c\uc77c2\ubcf4\ub2e4 \uc774\uc804\ud30c\uc77c\uc774\uba74 \ucc38
[ \ud30c\uc77c1 -ef \ud30c\uc77c2 ] : \ud30c\uc77c1\uc774 \ud30c\uc77c2\ub791 \uac19\uc740 \ud30c\uc77c\uc774\uba74 \ucc38
[ -r \ud30c\uc77c\uba85 ] : \ud574\ub2f9 \ud30c\uc77c\uc774 \uc77d\uae30 \uac00\ub2a5\ud558\uba74 \ucc38
[ -w \ud30c\uc77c\uba85 ] : \ud574\ub2f9 \ud30c\uc77c\uc774 \uc4f0\uae30 \uac00\ub2a5\ud558\uba74 \ucc38
[ -x \ud30c\uc77c\uba85 ] : \ud574\ub2f9 \ud30c\uc77c\uc774 \uc2e4\ud589 \uac00\ub2a5\ud558\uba74 \ucc38
[ -s \ud30c\uc77c\uba85 ] : \ud574\ub2f9 \ud30c\uc77c\uc758 \uc0ac\uc774\uc988\uac00 \uc81c\ub85c \uc774\uc0c1\uc774\uba74 \ucc38
[ -d \ud30c\uc77c\uba85 ] : \ud574\ub2f9 \ud30c\uc77c\uc774 \ub514\ub809\ud1a0\ub9ac\uba74 \ucc38
[ -f \ud30c\uc77c\uba85 ] : \ud574\ub2f9 \ud30c\uc77c\uc774 \ubcf4\ud1b5 \ud30c\uc77c\uc774\uba74 \ucc38
[ -h \ud30c\uc77c\uba85 ] : \ud574\ub2f9 \ud30c\uc77c\uc774 \ub9c1\ud06c \ud30c\uc77c\uc774\uba74 \ucc38

#############################
# while\ubb38 \uc608\uc81c
#############################
while [ $i -lt 3 ]
do
  echo $i
  i=$(($i+1))
done

#############################
# for\ubb38 \uc608\uc81c
#############################
for i in 1 2 3 4 5
do
   echo \"Welcome $i times\"
done
-----
for i in {1..5}
do
   echo \"Welcome $i times\"
done
-----
for (( ; ; ))
do
   echo \"infinite loops [ hit CTRL+C to stop]\"
done
-----
for file in \/etc\/*
do
  if [ \"${file}\" == \"\/etc\/resolv.conf\" ]
    then
      countNameservers=$(grep -c nameserver \/etc\/resolv.conf)
      echo \"Total  ${countNameservers} nameservers defined in ${file}\"
      break
  fi
done

#############################
# \ud30c\uc77c\uba85\uacfc \ud655\uc7a5\uc790 \ucd94\ucd9c
#############################
NAME=`echo \"$FILE\" | cut -d'.' -f1`
EXTENSION=`echo \"$FILE\" | cut -d'.' -f2`

FILE=test.tar.gz
% echo ${FILE%%.*}
test
% echo ${FILE%.*}
test.tar
% echo ${FILE#*.}
tar.gz
% echo ${FILE##*.}
gz

#############################
# find (\ud30c\uc77c\uba85 \uac80\uc0c9)
#############################
find . -name \"*.c\" -print
\u2191: *.c \ud30c\uc77c \ucc3e\uae30

find . -name \"*.c\" -print
\u2191: *.c \ud30c\uc77c\uc744 \ucc3e\uc544\uc11c .c$\ub85c \ud655\uc7a5\uc790 \ubcc0\uacbd

find . -atime +30 -print
\u2191: \uc77d\uc740\uc9c0 30\uc77c \uc774\uc0c1\ub41c \ud30c\uc77c \ucc3e\uae30

find . -mtime -1 -print
\u2191: 24\uc2dc\uac04 \ub0b4 \uc218\uc815\ub41c \ud30c\uc77c \ucc3e\uae30

find . -type f -name \"*.c\" -newer ttt.rc -print
\u2191: *c \ud30c\uc77c \uc911 ttt.rc \uc218\uc815 \uc774\ud6c4\uc5d0 \uc218\uc815\ub41c \ud30c\uc77c \ucc3e\uae30

find . -atime +7 -size +20480 -print
\u2191: \uc811\uadfc\ud55c\uc9c0 7\uc77c \uc774\uc0c1\uc774\uba70 10MB\uc774\uc0c1 \ud30c\uc77c(size unix:512B)

find . -name \"*.bak\" -print -exec rm -f {} \\;
\u2191: *.bak \ud30c\uc77c\uc744 \ucc3e\uc544\uc11c \ucd9c\ub825\ud558\uace0 \uc0ad\uc81c\ud55c\ub2e4. {}\ub294 \ucc3e\uc740 \ud30c\uc77c\uba85\uc774\uace0 \\;\ub294 \uba85\ub839\uc758 \ub05d\uc744 \uba85\uc2dc\ud568

find . -depth -name \"*.c\" -print -exec sh -c 'mv \"$1\" \"${1%.c}.c$\"' _ {} \\;
\u2191: \ubaa8\ub4e0 .c \ud30c\uc77c\uc744 \ucc3e\uc544 .c$\ub85c \ud655\uc7a5\uc790\ub9cc \ubcc0\uacbd\ud55c\ub2e4.

find . -print -exec touch -t \"201506171200.00\" {} \\;
find \/opt -name \"*\" -exec touch -t \"202101010000.00\" {} \\;
\u2191: \ud30c\uc77c \ubc0f \ub514\ub809\ud1a0\ub9ac\uc758 \uc2dc\uac04 \ubcc0\uacbd

# ${OLDLOG_EXPDATE}\uc77c \uc774\uc0c1 \uacbd\uacfc\ub41c \ub85c\uadf8\ub97c \uc0ad\uc81c\ud55c\ub2e4.
OLDLOG_EXPDATE=3
find \"\/var\/log\" -mtime +${OLDLOG_EXPDATE} -name \"*.log\" -type f -exec rm -f {} \\;

# \ubcf4\uc548\uc131 \uc2ec\uc758\ub97c \uc704\ud55c \ubd88\ud544\uc694\ud55c \ud30c\uc77c \uac80\uc0c9
find \/opt\/gate1\/www \\( -name \"*sample*\" -o -name \"*demo*\" -o -name \"*tutorial*\" -o -name \"*test*\" -o -name \"*manual*\" -o -name \"*example*\" -o -name \"*bak*\" -o -name \"*backup*\" -o -name \"*_[0-9][0-9][0-9]*\" \\) -print

#############################
# sed (stream editor: \ud30c\uc77c \ub0b4\uc758 \ubb38\uc790\uc5f4 \uc870\uc791)
#############################
\u261e\uae30\ubcf8\ubb38\ubc95 : sed -i 's\/\ucc3e\ub294\ubb38\uc790\uc5f4\/\ubc14\uafc0\ubb38\uc790\uc5f4\/g' \uc785\ub825\ud30c\uc77c
(.*[]^$&\/\\ \ubb38\uc790\ub294 \uba54\ud0c0\ubb38\uc790\ub77c \uc55e\uc5d0 \\\uc744 \ub450\uc5b4 \uad6c\ubd84\ud55c\ub2e4.)

sed -i -e 's\/Index\/\uc0c9\uc778\/g' -e 's\/Contents\/\ucc28\ub840\/g' test1.txt
\u2191: test1.txt \uc5d0\uc11c \"Index\"\uc744 \"\uc0c9\uc778\"\uc73c\ub85c \"Contents\"\ub97c \"\ucc28\ub840\"\ub85c \ubc14\uafb8\uc5b4 test2.txt\uc5d0 \uc800\uc7a5

sed -i 's\/\\\/usr\\\/local\/\\\/usr\/g' test1.txt
\u2191: \/usr\/local\uc744 \/usr\ub85c \ubc14\uafbc\ub2e4.

sed -i 's\/192.168.1\/10.10.10\/g' test1.txt
\u2191: 192.168.1\uc744 10.10.10\uc73c\ub85c \ubc14\uafbc\ub2e4.

sed -i '\/^ *$\/d' test1.txt
\u2191: \uacf5\ubc31\ub9cc \uc788\ub294 \ub77c\uc778 \uc0ad\uc81c (\uc8fc\uc758:^\uc640 *\uc0ac\uc774\uc5d0 \uacf5\ubc31 \uc788\uc74c)

sed -i 's\/[[:blank:]]*$\/g' test.txt
\u2191: \uc904\ub05d \uacf5\ubc31\uacfc \ud0ed \uc81c\uac70

sed -i 's\/\\t\/        \/g' tab-file.txt
\u2191: \ubaa8\ub4e0 \ud0ed\uc744 \uacf5\ubc31\uc73c\ub85c \uce58\ud658

sed -i 's\/^        \/\\t\/g' test.txt
\u2191: \ub9e8 \uc55e\uc5d0 \uacf5\ubc31\ub9cc \ud0ed\uc73c\ub85c \uce58\ud658 (Makefile \uc6a9)

sed -i 's\/<[^>]*>\/\/g' test.html
\u2191: test.html\uc5d0\uc11c HTML \ud0dc\uadf8 \uc0ad\uc81c

sed -n '\/[Ll]ove\/p' test1.txt
\u2191: Love or love\ub97c \ud3ec\ud568\ud558\ub294 \ub77c\uc778\ub9cc \ucd9c\ub825

sed -e '\/#\/d' test1.txt > test2.txt
\u2191: test1.txt\uc758 \ub0b4\uc6a9\uc5d0\uc11c #\uc73c\ub85c \uc2dc\uc791\ub418\ub294 \ud589\uc744 \ubaa8\ub450 \uc81c\uac70 (\uc8fc\uc11d \uc81c\uac70)

sed -e '1,10d' test1.txt > test2.txt
\u2191: 1~10\ud589 \uc0ad\uc81c

sed -i 's\/^M$\/\/' test1.txt
\u2191: DOS \uac1c\ud589\ubb38\uc790\ub97c UNIX \uac1c\ud589\ubb38\uc790\ub85c \ubcc0\uacbd (^M\uc740 \"Ctrl+V\" \ub204\ub974\uace0 \"Ctrl+M')

#############################
# \ud2b9\uc815 \ub514\ub809\ud1a0\ub9ac\uc758 \ub9c8\uc6b4\ud2b8 \uc5ec\ubd80 \uccb4\ud06c
#############################
is_mounted() {
  mount | awk -v MOUNT_DIR=\"${1}\" '{ if ($3 == MOUNT_DIR) { print 1 } } ENDFILE{ exit -1 }'
}
MOUNT_OK=$(is_mounted ${STORAGE_MOUNT_DIR})
if [ -z ${MOUNT_OK} ] || [ ${MOUNT_OK} != \"1\" ]
then
  echo \"ERROR: ${STORAGE_MOUNT_DIR} is not mounted.\"
  exit 2
fi

#############################
# touch (\ud30c\uc77c \uc2dc\uac04 \ubcc0\uacbd)
#############################
# \ud30c\uc77c \uc2dc\uac04(Access, Modify) \ubcc0\uacbd
touch -a -m -t 202101010000.00 file1

# \ud30c\uc77c \ub0a0\uc9dc \ud655\uc778
stat file1

# \ud30c\uc77c \ub0a0\uc9dc \uc77c\uad04 \ubcc0\uacbd
find \/mnt\/0_tmp -exec touch -a -m -t 202101010000.00 {} \\;

#############################
# grep (g\/re\/p: \ubb38\uc790\uc5f4 \uac80\uc0c9)
#############################
-i : \uc601\ubb38\uc758 \ub300\uc18c\ubb38\uc790\ub97c \uad6c\ubcc4\ud558\uc9c0 \uc54a\ub294\ub2e4.
-v : pattern\uc744 \ud3ec\ud568\ud558\uc9c0 \uc54a\ub294 \ub77c\uc778\uc744 \ucd9c\ub825\ud55c\ub2e4.
-n : \uac80\uc0c9 \uacb0\uacfc\uc758 \uac01 \ud589\uc758 \uc120\ub450\uc5d0 \ud589 \ubc88\ud638\ub97c \ub123\ub294\ub2e4(first line is 1).
-l : \ud30c\uc77c\uba85\ub9cc \ucd9c\ub825\ud55c\ub2e4.
-c : \ud328\ud134\uacfc \uc77c\uce58\ud558\ub294 \ub77c\uc778\uc758 \uac1c\uc218\ub9cc \ucd9c\ub825\ud55c\ub2e4.
-r : \ud558\uc704 \ub514\ub809\ud1a0\ub9ac\uae4c\uc9c0 \uac80\uc0c9\ud55c\ub2e4.

grep -i \"\ud64d\uae38\ub3d9|\uae40\ucca0\uc218|\ubc15\uc21c\ud76c\" .\/*
\ud604\uc7ac \ub514\ub809\ud1a0\ub9ac\uc758 \ubaa8\ub4e0 \ud30c\uc77c\uc5d0\uc11c \ud64d\uae38\ub3d9 or \uae40\ucca0\uc218 or \ubc15\uc21c\ud76c\ub97c \uac80\uc0c9\ud55c\ub2e4.

grep -rn \"Allow\" \/etc\/*
\/etc \ubc11\uc758 \ubaa8\ub4e0 \ud30c\uc77c\uc5d0\uc11c Allow \ubb38\uc790\uc5f4\uc744 \uac80\uc0c9\ud558\uace0 \ud589\ubc88\ud638\ub97c \ucd9c\ub825\ud55c\ub2e4.

#############################
# ln (link: \ud30c\uc77c or \ub514\ub809\ud1a0\ub9ac \ub9c1\ud06c)
#############################
ln -s <\uc6d0\ubcf8\ud30c\uc77c> <\uc2ec\ubcfc\ub9ad\ub9c1\ud06c\ud30c\uc77c>

ex) ln -s \/bin\/ls dir

\uc2ec\ubcfc\ub9ad \ub9c1\ud06c\ub294 \uc6d0\ubcf8\uc774 \uc0ad\uc81c\ub418\uba74 \uc0ac\uc6a9\ubd88\uac00\ud558\ub098 \ud558\ub4dc\ub9c1\ud06c\ub294 \uc0ac\uc6a9\uac00\ub2a5.

#############################
# tail (\ud30c\uc77c \ub0b4\uc6a9 \ub05d\ubd80\ubd84 \ubd80\ud130 \uc5f4\ub78c)
#############################
tail -f \/var\/log\/messages
\u2191: \/var\/log\/messages\ub97c \uc2e4\uc2dc\uac04\uc73c\ub85c \ucd9c\ub825(\ubaa8\ub2c8\ud130\ub9c1)

#############################
# Shell profile reload
#############################
. ~\/.profile
. ~\/.bash_profile
. \/etc\/profile

#############################
# ksh(AIX) Shell Auto Completion
#############################
-\uc790\ub3d9\uc644\uc131 : ESC+\\ or ESC+ESC
-\ud3b8\uc9d1 (vi \ubaa8\ub4dc)
ESC \ub97c \ub204\ub974\uba74 vi \ubaa8\ub4dc\ub85c \ub4e4\uc5b4\uac00\uace0 k,j \ub97c \uc774\uc6a9\ud558\uc5ec \ucee4\uc11c \uc774\ub3d9.
\u203b \ud658\uacbd\ubcc0\uc218\uc5d0 vi \ubaa8\ub4dc\ub85c \uc124\uc815\ub418\uc5b4 \uc788\uc5b4\uc57c \ud568.
EDITOR=vi; export EDITOR

#############################
# diff (\ud30c\uc77c\/\ub514\ub809\ud1a0\ub9ac \ube44\uad50\ud574\uc11c patch \ud30c\uc77c \ub9cc\ub4e6)
#############################
diff -urN dir.orig dir.work > dir.patch
(dir.orig\ub294 \uc6d0\ubcf8, dir.work\ub294 \uc791\uc5c5\ubcf8)
\uc11c\ub85c \ube44\uad50\ud574\uc11c \ub2e4\ub978\uc810\uc744 dir.patch\uc5d0 \ub123\ub294\ub2e4.

#############################
# patch
#############################
patch -p0 < dir.patch
(p0\ub294 p1, p2 \ub4f1\uc73c\ub85c \ubc14\uafc0 \uc218 \uc788\uc73c\uba70 \ub300\uc0c1 \uacbd\ub85c\uac00 \ud55c\ub2e8\uacc4\uc529 \uc904\uc5b4\ub4e0\ub2e4.)

#############################
# zip
#############################
zip -r -9 dir.zip dir

#############################
# zip
#############################
zip -r -9 dir.zip dir

#############################
# \uc785\ucd9c\ub825 \ub9ac\ub2e4\uc774\ub809\uc158
#############################
\uba85\ub839 >& \ud30c\uc77c\uba85 : \uba85\ub839\uc774 \uc2e4\ud589\ub41c \ud45c\uc900 \ucd9c\ub825\uc758 \uacb0\uacfc\uc640 \uc5d0\ub7ec\ub97c \ud30c\uc77c\ub85c \ucd9c\ub825
\uba85\ub839 >! \ud30c\uc77c\uba85 : \ud30c\uc77c\uc758 \uc874\uc7ac \uc720\ubb34\uc640 \uc0c1\uad00\uc5c6\uc774 \uc0dd\uc131\ud558\uace0 \uba85\ub839\uc774 \uc2e4\ud589\ub41c \ud45c\uc900 \ucd9c\ub825\uc758 \uacb0\uacfc\ub97c \ud30c\uc77c\ub85c \ucd9c\ub825
\uba85\ub839 >&! \ud30c\uc77c\uba85 : \ud30c\uc77c\uc758 \uc874\uc7ac \uc720\ubb34\uc640 \uc0c1\uad00\uc5c6\uc774 \uc0dd\uc131\ud558\uace0 \uba85\ub839\uc774 \uc2e4\ud589\ub41c \ud45c\uc900 \ucd9c\ub825\uc758 \uacb0\uacfc\uc640 \uc5d0\ub7ec\ub97c \ud30c\uc77c\ub85c \ucd9c\ub825
\uba85\ub839A | \uba85\ub839B : \uba85\ub839A\uc758 \ucd9c\ub825\uc744 \uba85\ub839B \uc785\ub825\uc73c\ub85c \uc0ac\uc6a9\ud558\uc5ec \uc2e4\ud589
\uba85\ub839A |& \uba85\ub839B : \uba85\ub839A\uc758 \ucd9c\ub825\uacfc \uc5d0\ub7ec\ub97c \uba85\ub839 B\uc758 \uc785\ub825\uc73c\ub85c \uc0ac\uc6a9\ud558\uc5ec \uc2e4\ud589

\u25a0 \ud30c\uc77c \ub514\uc2a4\ud06c\ub9bd\ud130
\ud45c\uc900\uc785\ub825:0 \ud45c\uc900\ucd9c\ub825:1 \ud45c\uc900\uc5d0\ub7ec:2

#############################
# \uc2dc\uc2a4\ud15c IP\uc8fc\uc18c \uc54c\uc544\ub0b4\uae30
#############################
get_system_ip_addr() {
  SYSTEM_IP_ADDR=$(hostname -I | awk '{print $1}')
  if [ -z ${SYSTEM_IP_ADDR} ]
  then
    echo \"ERROR: Unknown IP Address.\"
    exit
  fi
  echo ${SYSTEM_IP_ADDR}
}

#############################
# \uc2dc\uc2a4\ud15c \uc778\ud130\ud398\uc774\uc2a4\uba85 \uc54c\uc544\ub0b4\uae30
#############################
get_system_if_name() {
  SYSTEM_IF_NAME=$(ls -1 \/sys\/class\/net\/ | awk '{ if ( $1 != \"lo\") print $1 }' | head -n 1)
  if [ -z ${SYSTEM_IF_NAME} ]
  then
    echo \"ERROR: Unknown interface name.\"
    exit
  fi
  echo ${SYSTEM_IF_NAME}
}<\/pre>\n","protected":false},"excerpt":{"rendered":"
############################## \uc624\ub958 \ubc1c\uc0dd \uc2dc \uc2a4\ud06c\ub9bd\ud2b8 \uc2e4\ud589# \uc911\uc9c0 \ub610\ub294 \ubb34\uc2dc\ud558\uace0 \uc9c4\ud589#############################set -eset +e############################## \ubcc0\uc218 \uc0ac\uc6a9 \ubc29\ubc95 (Variable)#############################\u25a3 \uc704\uce58 \ub9e4\uac1c \ubcc0\uc218(Positional Parameters)$0 : \uc2e4\ud589\ub41c \uc2a4\ud06c\ub9bd\ud2b8 \uc774\ub984$1 : $1 $2 $3…${10}\uc778\uc790 \uc21c\uc11c\ub300\ub85c \ubc88\ud638\uac00 \ubd80\uc5ec\ub41c\ub2e4. 10\ubc88\uc9f8\ubd80\ud130\ub294 “{}”\uac10\uc2f8\uc918\uc57c \ud568$* : \uc804\uccb4 \uc778\uc790 \uac12$@ : \uc804\uccb4 \uc778\uc790 \uac12($* \ub3d9\uc77c\ud558\uc9c0\ub9cc \uc30d\ub530\uc634\ud45c\ub85c \ubcc0\uc218\ub97c \uac10\uc2f8\uba74 \ub2e4\ub978 \uacb0\uacfc \ub098\uc634)$# : \ub9e4\uac1c \ubcc0\uc218\uc758 \ucd1d \uac1c\uc218\u25a3 \ud2b9\uc218 […]<\/p>\n","protected":false},"author":2,"featured_media":0,"comment_status":"closed","ping_status":"open","sticky":true,"template":"","format":"standard","meta":{"_import_markdown_pro_load_document_selector":0,"_import_markdown_pro_submit_text_textarea":"","site-sidebar-layout":"default","site-content-layout":"","ast-site-content-layout":"default","site-content-style":"default","site-sidebar-style":"default","ast-global-header-display":"","ast-banner-title-visibility":"","ast-main-header-display":"","ast-hfb-above-header-display":"","ast-hfb-below-header-display":"","ast-hfb-mobile-header-display":"","site-post-title":"","ast-breadcrumbs-content":"","ast-featured-img":"","footer-sml-layout":"","theme-transparent-header-meta":"","adv-header-id-meta":"","stick-header-meta":"","header-above-stick-meta":"","header-main-stick-meta":"","header-below-stick-meta":"","astra-migrate-meta-layouts":"set","ast-page-background-enabled":"default","ast-page-background-meta":{"desktop":{"background-color":"","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-opacity":"","overlay-gradient":""},"tablet":{"background-color":"","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-opacity":"","overlay-gradient":""},"mobile":{"background-color":"","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-opacity":"","overlay-gradient":""}},"ast-content-background-meta":{"desktop":{"background-color":"var(--ast-global-color-5)","background-image":"","background-repeat":"repeat","background-position":"center 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center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-opacity":"","overlay-gradient":""}},"footnotes":""},"categories":[22],"tags":[],"class_list":["post-576","post","type-post","status-publish","format-standard","hentry","category-development_unix"],"_links":{"self":[{"href":"https:\/\/hasu0707.duckdns.org\/blog\/index.php?rest_route=\/wp\/v2\/posts\/576","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/hasu0707.duckdns.org\/blog\/index.php?rest_route=\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/hasu0707.duckdns.org\/blog\/index.php?rest_route=\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/hasu0707.duckdns.org\/blog\/index.php?rest_route=\/wp\/v2\/users\/2"}],"replies":[{"embeddable":true,"href":"https:\/\/hasu0707.duckdns.org\/blog\/index.php?rest_route=%2Fwp%2Fv2%2Fcomments&post=576"}],"version-history":[{"count":0,"href":"https:\/\/hasu0707.duckdns.org\/blog\/index.php?rest_route=\/wp\/v2\/posts\/576\/revisions"}],"wp:attachment":[{"href":"https:\/\/hasu0707.duckdns.org\/blog\/index.php?rest_route=%2Fwp%2Fv2%2Fmedia&parent=576"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/hasu0707.duckdns.org\/blog\/index.php?rest_route=%2Fwp%2Fv2%2Fcategories&post=576"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/hasu0707.duckdns.org\/blog\/index.php?rest_route=%2Fwp%2Fv2%2Ftags&post=576"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}