如何配置etc/profile环境变量

如何配置etc/profile环境变量

环境变量是操作系统用于保存应用程序和用户设置的一组变量。它们允许应用程序在不同的用户之间共享设置。环境变量也可以让您在不同的终端会话中使用相同的设置。

在Linux系统中，有三个主要的环境变量文件：

/etc/profile：在每次登录时都会加载

/etc/bash.bashrc：在每次打开终端会话时都会加载

~/.bash_profile：只有当使用“su”命令切换到另一个用户时才会加载

所有这些文件都是可以编辑的。要想永久更改环境变量，您需要编辑/etc/profile文件。

要编辑/etc/profile文件，请使用以下命令：

sudo nano /etc/profile

您将看到一个类似于以下内容的文件：

# /etc/profile: system-wide .profile file for the Bourne shell (sh(1))

# and Bourne compatible shells (bash(1), ksh(1), ash(1), ...).

if [ "$PS1" ]; then

if [ "$BASH" ] && [ "$BASH" != "/bin/sh" ]; then

# The file ~/.bash_logout contains commands to execute when logout.

if [ -f ~/.bash_logout ]; then

~/.bash_logout

fi

fi

fi

# If not running interactively, don't do anything

case $- in

*i*) ;;

*) return;;

esac

# don't put duplicate lines in the history. See bash(1) for more options

# ... or force ignoredups and ignorespace

HISTCONTROL=ignoredups:ignorespace

# append to the history file, don't overwrite it

shopt -s histappend

# for setting history length see HISTSIZE and HISTFILESIZE in bash(1)

HISTSIZE=1000

HISTFILESIZE=2000

# check the window size after each command and, if necessary,

# update the values of LINES and COLUMNS.

shopt -s checkwinsize

# If set, the pattern "**" used in a pathname expansion context will

# match all files and zero or more directories and subdirectories.

#shopt -s globstar

# make less more friendly for non-text input files, see lesspipe(1)

[ -x /usr/bin/lesspipe ] && eval "$(SHELL=/bin/sh lesspipe)"

# set variable identifying the chroot you work in (used in the prompt below)

if [ -z "${debian_chroot:-}" ] && [ -r /etc/debian_chroot ]; then

debian_chroot=$(cat /etc/debian_chroot)

fi

# set a fancy prompt (non-color, unless we know we "want" color)

case "$TERM" in

xterm-color|*-256color) color_prompt=yes;;

esac

# uncomment for a colored prompt, if the terminal has the capability; turned

# off by default to not distract the user: the focus in a terminal window

# should be on the output of commands, not on the prompt

#force_color_prompt=yes

if [ -n "$force_color_prompt" ]; then

if [ -x /usr/bin/tput ] && tput setaf 1 >&/dev/null; then

# We have color support; assume it's compliant with Ecma-48

# (ISO/IEC-6429). (Lack of such support is extremely rare, and such

# a case would tend to support setf rather than setaf.)

color_prompt=yes

else

color_prompt=

fi

fi

if [ "$color_prompt" = yes ]; then

PS1='${debian_chroot:+($debian_chroot)}\[\033[01;32m\]\u:\[\033[01;34m\]\w\[\033[00m\]\$ '

else

PS1='${debian_chroot:+($debian_chroot)}\u:\w\$ '

fi

unset color_prompt force_color_prompt

# If this is an xterm set the title to user@host:dir

case "$TERM" in

xterm*|rxvt*)

PS1="\[\e]0;${debian_chroot:+($debian_chroot)}\u@\h: \w\a\]$PS1"

;;

*)

;;

esac

# enable color support of ls and also add handy aliases

if [ -x /usr/bin/dircolors ]; then

test -r ~/.dircolors && eval "$(dircolors -b ~/.dircolors)" || eval "$(dircolors -b)"

alias ls='ls --color=auto'

#alias dir='dir --color=auto'

#alias vdir='vdir --color=auto'

alias grep='grep --color=auto'

alias fgrep='fgrep --color=auto'

alias egrep='egrep --color=auto'

fi

# colored GCC warnings and errors

#export GCC_COLORS='error=01;31:warning=01;35:note=01;36:caret=01;32:locus=01:quote=01'

# some more ls aliases

alias ll='ls -alF'

alias la='ls -A'

alias l='ls -CF'

# Add an "alert" alias for long running commands. Use like so:

# sleep 10; alert

alias alert='notify-send --urgency=low -i "$([ $? = 0 ] && echo terminal || echo error)" "$(history|tail -n1|sed -e '\''s/^\s*[0-9]\+\s*//;s/[;&|]\s*alert$//'\'')"'

# Alias definitions.

# You may want to put all your additions into a separate file like

# ~/.bash_aliases, instead of adding them here directly.

# See /usr/share/doc/bash-doc/examples in the bash-doc package.

if [ -f ~/.bash_aliases ]; then

. ~/.bash_aliases

fi

# enable programmable completion features (you don't need to enable

# this, if it's already enabled in /etc/bash.bashrc and /etc/profile

# sources /etc/bash.bashrc).

if ! shopt -oq posix; then

if [ -f /usr/share/bash-completion/bash_completion ]; then

. /usr/share/bash-completion/bash_completion

elif [ -f /etc/bash_completion ]; then

. /etc/bash_completion

fi

fi

export JAVA_HOME=/usr/lib/jvm/java-8-oracle

export PATH=$PATH:$JAVA_HOME/bin

export CLASSPATH=.:$JAVA_HOME/lib/dt.jar:$JAVA_HOME/lib/tools.jar

export CATALINA_HOME=/opt/tomcat

export PATH=$PATH:$CATALINA_HOME/bin