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쉘프로그래밍강좌088: 생성한 쉘변수의 export속성제거하기

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쉘프로그래밍강좌088: 생성한 쉘변수의 export속성제거하기

 

 

 

 

아래와 같이 아무런 옵션 없이 export라고만 하면 현재 정의된 변수와 그 값들이 출력됩니다.

 

 

 

  -p옵션을 사용하여 "export -p"라고 하여도 마찬가지입니다.

 

 

 

 

 

[root@RockyLinux01 etc]# export

declare -x DBUS_SESSION_BUS_ADDRESS="unix:path=/run/user/0/bus"

declare -x DEBUGINFOD_URLS="https://debuginfod.centos.org/ "

declare -x GUESTFISH_INIT="\\e[1;34m"

declare -x GUESTFISH_OUTPUT="\\e[0m"

declare -x GUESTFISH_PS1="\\[\\e[1;32m\\]><fs>\\[\\e[0;31m\\] "

declare -x GUESTFISH_RESTORE="\\e[0m"

declare -x HISTCONTROL="ignoredups"

declare -x HISTSIZE="1000"

declare -x HOME="/root"

declare -x HOSTNAME="www.linux.co.kr"

declare -x LANG="ko_KR.UTF-8"

declare -x LESSOPEN="||/usr/bin/lesspipe.sh %s"

declare -x LOADEDMODULES=""

declare -x LOGNAME="root"

declare -x LS_COLORS="rs=0:di=01;34:ln=01;36:mh=00:pi=40;33:so=01;35:do=01;35:bd=40;33;01:cd=40;33;01:or=40;31;01:mi=01;37;41:su=37;41:sg=30;43:ca=30;41:tw=30;42:ow=34;42:st=37;44:ex=01;32:*.tar=01;31:*.tgz=01;31:*.arc=01;31:*.arj=01;31:*.taz=01;31:*.lha=01;31:*.lz4=01;31:*.lzh=01;31:*.lzma=01;31:*.tlz=01;31:*.txz=01;31:*.tzo=01;31:*.t7z=01;31:*.zip=01;31:*.z=01;31:*.dz=01;31:*.gz=01;31:*.lrz=01;31:*.lz=01;31:*.lzo=01;31:*.xz=01;31:*.zst=01;31:*.tzst=01;31:*.bz2=01;31:*.bz=01;31:*.tbz=01;31:*.tbz2=01;31:*.tz=01;31:*.deb=01;31:*.rpm=01;31:*.jar=01;31:*.war=01;31:*.ear=01;31:*.sar=01;31:*.rar=01;31:*.alz=01;31:*.ace=01;31:*.zoo=01;31:*.cpio=01;31:*.7z=01;31:*.rz=01;31:*.cab=01;31:*.wim=01;31:*.swm=01;31:*.dwm=01;31:*.esd=01;31:*.jpg=01;35:*.jpeg=01;35:*.mjpg=01;35:*.mjpeg=01;35:*.gif=01;35:*.bmp=01;35:*.pbm=01;35:*.pgm=01;35:*.ppm=01;35:*.tga=01;35:*.xbm=01;35:*.xpm=01;35:*.tif=01;35:*.tiff=01;35:*.png=01;35:*.svg=01;35:*.svgz=01;35:*.mng=01;35:*.pcx=01;35:*.mov=01;35:*.mpg=01;35:*.mpeg=01;35:*.m2v=01;35:*.mkv=01;35:*.webm=01;35:*.webp=01;35:*.ogm=01;35:*.mp4=01;35:*.m4v=01;35:*.mp4v=01;35:*.vob=01;35:*.qt=01;35:*.nuv=01;35:*.wmv=01;35:*.asf=01;35:*.rm=01;35:*.rmvb=01;35:*.flc=01;35:*.avi=01;35:*.fli=01;35:*.flv=01;35:*.gl=01;35:*.dl=01;35:*.xcf=01;35:*.xwd=01;35:*.yuv=01;35:*.cgm=01;35:*.emf=01;35:*.ogv=01;35:*.ogx=01;35:*.aac=01;36:*.au=01;36:*.flac=01;36:*.m4a=01;36:*.mid=01;36:*.midi=01;36:*.mka=01;36:*.mp3=01;36:*.mpc=01;36:*.ogg=01;36:*.ra=01;36:*.wav=01;36:*.oga=01;36:*.opus=01;36:*.spx=01;36:*.xspf=01;36:"

declare -x MAIL="/var/spool/mail/root"

declare -x MANPATH="/usr/share/man:"

declare -x MODULEPATH="/etc/scl/modulefiles:/usr/share/Modules/modulefiles:/etc/modulefiles:/usr/share/modulefiles"

declare -x MODULESHOME="/usr/share/Modules"

declare -x MODULES_CMD="/usr/share/Modules/libexec/modulecmd.tcl"

declare -x MODULES_RUN_QUARANTINE="LD_LIBRARY_PATH LD_PRELOAD"

declare -x MOTD_SHOWN="pam"

declare -x OLDPWD="/root/test"

declare -x PATH="/root/.local/bin:/root/bin:/usr/share/Modules/bin:/usr/local/sbin:/usr/local/bin:/usr/sbin:/usr/bin"

declare -x PWD="/etc"

declare -x SHELL="/bin/bash"

declare -x SHLVL="1"

declare -x SSH_CLIENT="192.168.19.111 57112 22"

declare -x SSH_CONNECTION="192.168.19.111 57112 192.168.19.201 22"

declare -x SSH_TTY="/dev/pts/0"

declare -x TERM="xterm"

declare -x USER="root"

declare -x XDG_DATA_DIRS="/root/.local/share/flatpak/exports/share:/var/lib/flatpak/exports/share:/usr/local/share:/usr/share"

declare -x XDG_RUNTIME_DIR="/run/user/0"

declare -x XDG_SESSION_CLASS="user"

declare -x XDG_SESSION_ID="2"

declare -x XDG_SESSION_TYPE="tty"

declare -x myid="1000"

declare -x myname="PARK SUNGSOO"

declare -x varname="2000"

declare -x which_declare="declare -f"

[root@RockyLinux01 etc]#

 

 

 

 

그리고 아래와 같이 NAME이라는 변수에 "ParkSungSoo"값을 넣어 export시켰습니다.

 

 

 

  그리고 다시 export라는 명령어를 실행하여 현재 정의된 변수들을 확인 하였습니다.

 

 

 

  아래 결과에서는 앞의 결과에는 없었던 NAME이라는 변수와 값이 출력됨을 확인할 수 있습니다.

 

 

 

 

 

[root@RockyLinux01 etc]# export NAME=ParkSungSoo

[root@RockyLinux01 etc]#

[root@RockyLinux01 etc]# export

declare -x DBUS_SESSION_BUS_ADDRESS="unix:path=/run/user/0/bus"

declare -x DEBUGINFOD_URLS="https://debuginfod.centos.org/ "

declare -x GUESTFISH_INIT="\\e[1;34m"

declare -x GUESTFISH_OUTPUT="\\e[0m"

declare -x GUESTFISH_PS1="\\[\\e[1;32m\\]><fs>\\[\\e[0;31m\\] "

declare -x GUESTFISH_RESTORE="\\e[0m"

declare -x HISTCONTROL="ignoredups"

declare -x HISTSIZE="1000"

declare -x HOME="/root"

declare -x HOSTNAME="www.linux.co.kr"

declare -x LANG="ko_KR.UTF-8"

declare -x LESSOPEN="||/usr/bin/lesspipe.sh %s"

declare -x LOADEDMODULES=""

declare -x LOGNAME="root"

declare -x LS_COLORS="rs=0:di=01;34:ln=01;36:mh=00:pi=40;33:so=01;35:do=01;35:bd=40;33;01:cd=40;33;01:or=40;31;01:mi=01;37;41:su=37;41:sg=30;43:ca=30;41:tw=30;42:ow=34;42:st=37;44:ex=01;32:*.tar=01;31:*.tgz=01;31:*.arc=01;31:*.arj=01;31:*.taz=01;31:*.lha=01;31:*.lz4=01;31:*.lzh=01;31:*.lzma=01;31:*.tlz=01;31:*.txz=01;31:*.tzo=01;31:*.t7z=01;31:*.zip=01;31:*.z=01;31:*.dz=01;31:*.gz=01;31:*.lrz=01;31:*.lz=01;31:*.lzo=01;31:*.xz=01;31:*.zst=01;31:*.tzst=01;31:*.bz2=01;31:*.bz=01;31:*.tbz=01;31:*.tbz2=01;31:*.tz=01;31:*.deb=01;31:*.rpm=01;31:*.jar=01;31:*.war=01;31:*.ear=01;31:*.sar=01;31:*.rar=01;31:*.alz=01;31:*.ace=01;31:*.zoo=01;31:*.cpio=01;31:*.7z=01;31:*.rz=01;31:*.cab=01;31:*.wim=01;31:*.swm=01;31:*.dwm=01;31:*.esd=01;31:*.jpg=01;35:*.jpeg=01;35:*.mjpg=01;35:*.mjpeg=01;35:*.gif=01;35:*.bmp=01;35:*.pbm=01;35:*.pgm=01;35:*.ppm=01;35:*.tga=01;35:*.xbm=01;35:*.xpm=01;35:*.tif=01;35:*.tiff=01;35:*.png=01;35:*.svg=01;35:*.svgz=01;35:*.mng=01;35:*.pcx=01;35:*.mov=01;35:*.mpg=01;35:*.mpeg=01;35:*.m2v=01;35:*.mkv=01;35:*.webm=01;35:*.webp=01;35:*.ogm=01;35:*.mp4=01;35:*.m4v=01;35:*.mp4v=01;35:*.vob=01;35:*.qt=01;35:*.nuv=01;35:*.wmv=01;35:*.asf=01;35:*.rm=01;35:*.rmvb=01;35:*.flc=01;35:*.avi=01;35:*.fli=01;35:*.flv=01;35:*.gl=01;35:*.dl=01;35:*.xcf=01;35:*.xwd=01;35:*.yuv=01;35:*.cgm=01;35:*.emf=01;35:*.ogv=01;35:*.ogx=01;35:*.aac=01;36:*.au=01;36:*.flac=01;36:*.m4a=01;36:*.mid=01;36:*.midi=01;36:*.mka=01;36:*.mp3=01;36:*.mpc=01;36:*.ogg=01;36:*.ra=01;36:*.wav=01;36:*.oga=01;36:*.opus=01;36:*.spx=01;36:*.xspf=01;36:"

declare -x MAIL="/var/spool/mail/root"

declare -x MANPATH="/usr/share/man:"

declare -x MODULEPATH="/etc/scl/modulefiles:/usr/share/Modules/modulefiles:/etc/modulefiles:/usr/share/modulefiles"

declare -x MODULESHOME="/usr/share/Modules"

declare -x MODULES_CMD="/usr/share/Modules/libexec/modulecmd.tcl"

declare -x MODULES_RUN_QUARANTINE="LD_LIBRARY_PATH LD_PRELOAD"

declare -x MOTD_SHOWN="pam"

declare -x NAME="ParkSungSoo"

declare -x OLDPWD="/root/test"

declare -x PATH="/root/.local/bin:/root/bin:/usr/share/Modules/bin:/usr/local/sbin:/usr/local/bin:/usr/sbin:/usr/bin"

declare -x PWD="/etc"

declare -x SHELL="/bin/bash"

declare -x SHLVL="1"

declare -x SSH_CLIENT="192.168.19.111 57112 22"

declare -x SSH_CONNECTION="192.168.19.111 57112 192.168.19.201 22"

declare -x SSH_TTY="/dev/pts/0"

declare -x TERM="xterm"

declare -x USER="root"

declare -x XDG_DATA_DIRS="/root/.local/share/flatpak/exports/share:/var/lib/flatpak/exports/share:/usr/local/share:/usr/share"

declare -x XDG_RUNTIME_DIR="/run/user/0"

declare -x XDG_SESSION_CLASS="user"

declare -x XDG_SESSION_ID="2"

declare -x XDG_SESSION_TYPE="tty"

declare -x myid="1000"

declare -x myname="PARK SUNGSOO"

declare -x varname="2000"

declare -x which_declare="declare -f"

[root@RockyLinux01 etc]#

 

 

 

 

그리고 정의된 NAME이라는 변수를 다음과 같이 제거하였습니다.

 

 

 

  export를 이용하여 변수를 제거하려면 다음과 같은 형식을 사용합니다.

 

 

 

 

 

사용형식 : export -n 변수명

 

 

 

즉, export로 할당하였던 변수를 제거하려면 -n옵션을 사용합니다.

 

 

 

 

 

그리고 아래는 NAME이라는 변수를 제거한 후에 다시 export명령어를 실행하여 현재 정의된 변수들을 확인한 것입니다.

 

 

 

 

 

[root@RockyLinux01 etc]# export -n NAME

[root@RockyLinux01 etc]#

[root@RockyLinux01 etc]# export

declare -x DBUS_SESSION_BUS_ADDRESS="unix:path=/run/user/0/bus"

declare -x DEBUGINFOD_URLS="https://debuginfod.centos.org/ "

declare -x GUESTFISH_INIT="\\e[1;34m"

declare -x GUESTFISH_OUTPUT="\\e[0m"

declare -x GUESTFISH_PS1="\\[\\e[1;32m\\]><fs>\\[\\e[0;31m\\] "

declare -x GUESTFISH_RESTORE="\\e[0m"

declare -x HISTCONTROL="ignoredups"

declare -x HISTSIZE="1000"

declare -x HOME="/root"

declare -x HOSTNAME="www.linux.co.kr"

declare -x LANG="ko_KR.UTF-8"

declare -x LESSOPEN="||/usr/bin/lesspipe.sh %s"

declare -x LOADEDMODULES=""

declare -x LOGNAME="root"

declare -x LS_COLORS="rs=0:di=01;34:ln=01;36:mh=00:pi=40;33:so=01;35:do=01;35:bd=40;33;01:cd=40;33;01:or=40;31;01:mi=01;37;41:su=37;41:sg=30;43:ca=30;41:tw=30;42:ow=34;42:st=37;44:ex=01;32:*.tar=01;31:*.tgz=01;31:*.arc=01;31:*.arj=01;31:*.taz=01;31:*.lha=01;31:*.lz4=01;31:*.lzh=01;31:*.lzma=01;31:*.tlz=01;31:*.txz=01;31:*.tzo=01;31:*.t7z=01;31:*.zip=01;31:*.z=01;31:*.dz=01;31:*.gz=01;31:*.lrz=01;31:*.lz=01;31:*.lzo=01;31:*.xz=01;31:*.zst=01;31:*.tzst=01;31:*.bz2=01;31:*.bz=01;31:*.tbz=01;31:*.tbz2=01;31:*.tz=01;31:*.deb=01;31:*.rpm=01;31:*.jar=01;31:*.war=01;31:*.ear=01;31:*.sar=01;31:*.rar=01;31:*.alz=01;31:*.ace=01;31:*.zoo=01;31:*.cpio=01;31:*.7z=01;31:*.rz=01;31:*.cab=01;31:*.wim=01;31:*.swm=01;31:*.dwm=01;31:*.esd=01;31:*.jpg=01;35:*.jpeg=01;35:*.mjpg=01;35:*.mjpeg=01;35:*.gif=01;35:*.bmp=01;35:*.pbm=01;35:*.pgm=01;35:*.ppm=01;35:*.tga=01;35:*.xbm=01;35:*.xpm=01;35:*.tif=01;35:*.tiff=01;35:*.png=01;35:*.svg=01;35:*.svgz=01;35:*.mng=01;35:*.pcx=01;35:*.mov=01;35:*.mpg=01;35:*.mpeg=01;35:*.m2v=01;35:*.mkv=01;35:*.webm=01;35:*.webp=01;35:*.ogm=01;35:*.mp4=01;35:*.m4v=01;35:*.mp4v=01;35:*.vob=01;35:*.qt=01;35:*.nuv=01;35:*.wmv=01;35:*.asf=01;35:*.rm=01;35:*.rmvb=01;35:*.flc=01;35:*.avi=01;35:*.fli=01;35:*.flv=01;35:*.gl=01;35:*.dl=01;35:*.xcf=01;35:*.xwd=01;35:*.yuv=01;35:*.cgm=01;35:*.emf=01;35:*.ogv=01;35:*.ogx=01;35:*.aac=01;36:*.au=01;36:*.flac=01;36:*.m4a=01;36:*.mid=01;36:*.midi=01;36:*.mka=01;36:*.mp3=01;36:*.mpc=01;36:*.ogg=01;36:*.ra=01;36:*.wav=01;36:*.oga=01;36:*.opus=01;36:*.spx=01;36:*.xspf=01;36:"

declare -x MAIL="/var/spool/mail/root"

declare -x MANPATH="/usr/share/man:"

declare -x MODULEPATH="/etc/scl/modulefiles:/usr/share/Modules/modulefiles:/etc/modulefiles:/usr/share/modulefiles"

declare -x MODULESHOME="/usr/share/Modules"

declare -x MODULES_CMD="/usr/share/Modules/libexec/modulecmd.tcl"

declare -x MODULES_RUN_QUARANTINE="LD_LIBRARY_PATH LD_PRELOAD"

declare -x MOTD_SHOWN="pam"

declare -x OLDPWD="/root/test"

declare -x PATH="/root/.local/bin:/root/bin:/usr/share/Modules/bin:/usr/local/sbin:/usr/local/bin:/usr/sbin:/usr/bin"

declare -x PWD="/etc"

declare -x SHELL="/bin/bash"

declare -x SHLVL="1"

declare -x SSH_CLIENT="192.168.19.111 57112 22"

declare -x SSH_CONNECTION="192.168.19.111 57112 192.168.19.201 22"

declare -x SSH_TTY="/dev/pts/0"

declare -x TERM="xterm"

declare -x USER="root"

declare -x XDG_DATA_DIRS="/root/.local/share/flatpak/exports/share:/var/lib/flatpak/exports/share:/usr/local/share:/usr/share"

declare -x XDG_RUNTIME_DIR="/run/user/0"

declare -x XDG_SESSION_CLASS="user"

declare -x XDG_SESSION_ID="2"

declare -x XDG_SESSION_TYPE="tty"

declare -x myid="1000"

declare -x myname="PARK SUNGSOO"

declare -x varname="2000"

declare -x which_declare="declare -f"

[root@RockyLinux01 etc]#

 

 

 

 

결과 NAME이라는 변수가 export해제된 것을 확인할 수 있습니다.

 

 

 

  이렇게 정의된 변수를 해제하려면 -n옵션을 사용하시면 됩니다.

 

 

 

거듭 당부 드리는 말씀이지만 export는 이 웹사이트의 declare강좌편과 함께 보시기 바랍니다.

 

 

 

 

 

 

 
"무단배포금지: 클라우드포털(www.linux.co.kr)의 모든 강좌는 저작권에 의해 보호되는 콘텐츠입니다. 무단으로 복제하여 배포하는 행위는 금지되어 있습니다."

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