在 Bash 脚本中重新加载环境变量
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Reload Environment Variables in a Bash Script
提问by GeekTantra
How can I reload the environment variables in a Bash Script. I am updating ~/.bashrc in the same script and want the changes to get reflected.
如何在 Bash 脚本中重新加载环境变量。我正在同一脚本中更新 ~/.bashrc 并希望更改得到反映。
I have tried using
我试过使用
source ~/.bashrc
The following is my script
以下是我的脚本
#!/bin/bash
echo $PATH
echo "export PATH=$PATH:/home/user/test" >> ~/.bashrc
source ~/.bashrc
echo $PATH
Both the echos return the same value of $PATH. But when I run echo $PATH on another instance of bash it returns the newly added path.
两个回声都返回相同的 $PATH 值。但是当我在另一个 bash 实例上运行 echo $PATH 时，它返回新添加的路径。
Any help would be appreciated.
任何帮助，将不胜感激。
Thanks.
谢谢。
The following is the content of my .bashrc file (without the modifications from the script)
以下是我的 .bashrc 文件的内容（没有脚本的修改）
# ~/.bashrc: executed by bash(1) for non-login shells.
# see /usr/share/doc/bash/examples/startup-files (in the package bash-doc)
# for examples
# If not running interactively, don't do anything
[ -z "$PS1" ] && return
HISTCONTROL=ignoredups:ignorespace
shopt -s histappend
HISTSIZE=1000
HISTFILESIZE=2000
shopt -s checkwinsize
[ -x /usr/bin/lesspipe ] && eval "$(SHELL=/bin/sh lesspipe)"
if [ -z "$debian_chroot" ] && [ -r /etc/debian_chroot ]; then
debian_chroot=$(cat /etc/debian_chroot)
fi
case "$TERM" in
xterm-color) color_prompt=yes;;
esac
if [ -n "$force_color_prompt" ]; then
if [ -x /usr/bin/tput ] && tput setaf 1 >&/dev/null; then
color_prompt=yes
else
color_prompt=
fi
fi
if [ "$color_prompt" = yes ]; then
PS1='${debian_chroot:+($debian_chroot)}\[3[01;32m\]\u@\h\[3[00m\]:\[3[01;34m\]\w\[3[00m\]$ '
else
PS1='${debian_chroot:+($debian_chroot)}\u@\h:\w$ '
fi
unset color_prompt force_color_prompt
case "$TERM" in
xterm*|rxvt*)
PS1="\[\e]0;${debian_chroot:+($debian_chroot)}\u@\h: \w\a\]$PS1"
;;
*)
;;
esac
if [ -x /usr/bin/dircolors ]; then
test -r ~/.dircolors && eval "$(dircolors -b ~/.dircolors)" || eval "$(dircolors -b)"
alias ls='ls --color=auto'
#alias dir='dir --color=auto'
#alias vdir='vdir --color=auto'
alias grep='grep --color=auto'
alias fgrep='fgrep --color=auto'
alias egrep='egrep --color=auto'
fi
alias ll='ls -alF'
alias la='ls -A'
alias l='ls -CF'
if [ -f ~/.bash_aliases ]; then
. ~/.bash_aliases
fi
if [ -f /etc/bash_completion ] && ! shopt -oq posix; then
. /etc/bash_completion
fi
回答by Jonathan Leffler
Your .bashrc starts:
你的 .bashrc 开始：
# If not running interactively, don't do anything
[ -z "$PS1" ] && return
Since your script does not have PS1 set (because it is not interactive), it doesn't reset path because it exits early - exactly as B Mitchsuggested. To demonstrate, modify your script:
由于您的脚本没有设置 PS1（因为它不是交互式的），它不会重置路径，因为它提前退出 - 正如B Mitch建议的那样。为了演示，请修改您的脚本：
#!/bin/bash
echo $PATH
echo "export PATH=$PATH:/home/user/test" >> ~/.bashrc
PS1='$ '
source ~/.bashrc
echo $PATH
