Linux - 查看环境变量

查看当前会话中的某个环境变量,使用echo命令;查看当前会话中预设的环境变量,使用env命令;如果我既想看当前会话中预设的环境变量,也想查看用户自定义的变量,使用set命令.

1. echo

[root@localhost ~]# echo $LANG
zh_CN.UTF-8

2. env

 

[root@localhost ~]# env
SSH_AGENT_PID=8031
HOSTNAME=localhost.localdomain
DESKTOP_STARTUP_ID=
SHELL=/bin/bash
TERM=xterm
HISTSIZE=1000
GTK_RC_FILES=/etc/gtk/gtkrc:/root/.gtkrc-1.2-gnome2
WINDOWID=56623185
USER=root
LS_COLORS=no=00:fi=00:di=00;34:ln=00;36:pi=40;33:so=00;35:bd=40;33;01:cd=40;33;01:or=01;

05;37;41:mi=01;05;37;41:ex=00;32:*.cmd=00;32:*.exe=00;32:*.com=00;32:*.btm=00;32:*.bat=

00;32:*.sh=00;32:*.csh=00;32:*.tar=00;31:*.tgz=00;31:*.arj=00;31:*.taz=00;31:*.lzh=00;31:

*.zip=00;31:*.z=00;31:*.Z=00;31:*.gz=00;31:*.bz2=00;31:*.bz=00;31:*.tz=00;31:*.rpm=00;31:

*.cpio=00;31:*.jpg=00;35:*.gif=00;35:*.bmp=00;35:*.xbm=00;35:*.xpm=00;35:*.png=00;35:

*.tif=00;35:
GNOME_KEYRING_SOCKET=/tmp/keyring-60VNEO/socket
SSH_AUTH_SOCK=/tmp/ssh-uOkZpG7931/agent.7931
KDEDIR=/usr
SESSION_MANAGER=local/localhost.localdomain:/tmp/.ICE-unix/7931
MAIL=/var/spool/mail/root
DESKTOP_SESSION=default
PATH=/usr/kerberos/sbin:/usr/kerberos/bin:/usr/local/sbin:/usr/local/bin:/sbin:/bin:/usr/sbin:/usr/bin

:/usr/X11R6/bin:/root/bin
INPUTRC=/etc/inputrc
PWD=/root
XMODIFIERS=@im=htt
LANG=zh_CN.UTF-8
GDMSESSION=default
SSH_ASKPASS=/usr/libexec/openssh/gnome-ssh-askpass
HOME=/root
SHLVL=2
GNOME_DESKTOP_SESSION_ID=Default
LOGNAME=root
DBUS_SESSION_BUS_ADDRESS=unix:abstract=/tmp/dbus-6fdxuvOEDM
LESSOPEN=|/usr/bin/lesspipe.sh %s
DISPLAY=:0.0
GTK_IM_MODULE=iiim
G_BROKEN_FILENAMES=1
COLORTERM=gnome-terminal
XAUTHORITY=/root/.Xauthority
_=/bin/env 

3. set

 

[root@localhost ~]# name=yuechaotian
[root@localhost ~]# set
BASH=/bin/bash
BASH_ARGC=()
BASH_ARGV=()
BASH_LINENO=()
BASH_SOURCE=()
BASH_VERSINFO=([0]="3" [1]="00" [2]="15" [3]="1" [4]="release" [5]="i686-redhat-linux-gnu")
BASH_VERSION='3.00.15(1)-release'
COLORS=/etc/DIR_COLORS.xterm
COLORTERM=gnome-terminal
COLUMNS=80
DBUS_SESSION_BUS_ADDRESS=unix:abstract=/tmp/dbus-6fdxuvOEDM
DESKTOP_SESSION=default
DESKTOP_STARTUP_ID=
DIRSTACK=()
DISPLAY=:0.0
EUID=0
GDMSESSION=default
GNOME_DESKTOP_SESSION_ID=Default
GNOME_KEYRING_SOCKET=/tmp/keyring-60VNEO/socket
GROUPS=()
GTK_IM_MODULE=iiim
GTK_RC_FILES=/etc/gtk/gtkrc:/root/.gtkrc-1.2-gnome2
G_BROKEN_FILENAMES=1
HISTFILE=/root/.bash_history
HISTFILESIZE=1000
HISTSIZE=1000
HOME=/root
HOSTNAME=localhost.localdomain
HOSTTYPE=i686
IFS=$' \t\n'
INPUTRC=/etc/inputrc
KDEDIR=/usr
LANG=zh_CN.UTF-8
LESSOPEN='|/usr/bin/lesspipe.sh %s'
LINES=24
LOGNAME=root
LS_COLORS='no=00:fi=00:di=00;34:ln=00;36:pi=40;33:so=00;35:bd=40;33;01:cd=40;33;01:or=01;

05;37;41:mi=01;05;37;41:ex=00;32:*.cmd=00;32:*.exe=00;32:*.com=00;32:*.btm=00;32:*.bat=

00;32:*.sh=00;32:*.csh=00;32:*.tar=00;31:*.tgz=00;31:*.arj=00;31:*.taz=00;31:*.lzh=00;31:

*.zip=00;31:*.z=00;31:*.Z=00;31:*.gz=00;31:*.bz2=00;31:*.bz=00;31:*.tz=00;31:*.rpm=00;31:

*.cpio=00;31:*.jpg=00;35:*.gif=00;35:*.bmp=00;35:*.xbm=00;35:*.xpm=00;35:*.png=00;35:*.tif=

00;35:'
MACHTYPE=i686-redhat-linux-gnu
MAIL=/var/spool/mail/root
MAILCHECK=60
OPTERR=1
OPTIND=1
OSTYPE=linux-gnu
PATH=/usr/kerberos/sbin:/usr/kerberos/bin:/usr/local/sbin:/usr/local/bin:/sbin:/bin:/usr/sbin:/usr/bin

:/usr/X11R6/bin:/root/bin
PIPESTATUS=([0]="0")
PPID=21483
PROMPT_COMMAND='echo -ne "\033]0;${USER}@${HOSTNAME%%.*}:${PWD/#$HOME/~}\007"'
PS1='[\u@\h \W]\$ '
PS2='> '
PS4='+ '
PWD=/root
SESSION_MANAGER=local/localhost.localdomain:/tmp/.ICE-unix/7931
SHELL=/bin/bash
SHELLOPTS=braceexpand:emacs:hashall:histexpand:history:interactive-comments:monitor
SHLVL=2
SSH_AGENT_PID=8031
SSH_ASKPASS=/usr/libexec/openssh/gnome-ssh-askpass
SSH_AUTH_SOCK=/tmp/ssh-uOkZpG7931/agent.7931
SUPPORTED=zh_CN.UTF-8:zh_CN:zh:en_US.UTF-8:en_US:en
TERM=xterm
UID=0
USER=root
WINDOWID=56623185
XAUTHORITY=/root/.Xauthority
XMODIFIERS=@im=htt
_=
name=yuechaotian