Linux shell script programming All In One
shell 脚本编程
Linux 系统中登录 shell 的时候，会从下面的 5 个启动文件里读取命令；
# 系统级，所有登录用户都会先启动这个文件
$ cat /etc/profile
# 用户级，按照Linux 发行版中实际存在的文件个数，依次进行启动
$ cat $HOME/.bash_profile
$ cat $HOME/.bashrc
$ cat $HOME/.bash_login
$ cat $HOME/.profile
shell types
shell 类型 / shell 种类
# $ which shell
$ which bash
$ which sh
$ which zsh
| 系统 | 截图 |
|---|---|
| Raspberry Pi |  |
| macOS |  |
启动文件
- 系统的 shell 启动配置文件
/etc/profile
$ cat /etc/profile
$ cat /etc/profile
# /etc/profile: system-wide .profile file for the Bourne shell (sh(1))
# and Bourne compatible shells (bash(1), ksh(1), ash(1), ...).
if [ "$(id -u)" -eq 0 ]; then
PATH="/usr/local/sbin:/usr/local/bin:/usr/sbin:/usr/bin:/sbin:/bin"
else
PATH="/usr/local/sbin:/usr/local/bin:/usr/sbin:/usr/bin:/sbin:/bin:/usr/local/games:/usr/games"
fi
export PATH
if [ "${PS1-}" ]; then
if [ "${BASH-}" ] && [ "$BASH" != "/bin/sh" ]; then
# The file bash.bashrc already sets the default PS1.
# PS1='\h:\w\$ '
if [ -f /etc/bash.bashrc ]; then
. /etc/bash.bashrc
fi
else
if [ "$(id -u)" -eq 0 ]; then
PS1='# '
else
PS1='$ '
fi
fi
fi
if [ -d /etc/profile.d ]; then
for i in /etc/profile.d/*.sh; do
if [ -r $i ]; then
. $i
fi
done
unset i
fi
# 配置文件目录 `/etc/profile.d`
$ ls -al /etc/profile.d
- 用户的 shell 启动配置文件
$HOME/.profile
$ cat $HOME/.profile
# 等价于
$ cd ~ && cat .profile
$ cat $HOME/.profile
# 等价于
$ cd ~ && cat .profile
# ~/.profile: executed by the command interpreter for login shells.
# This file is not read by bash(1), if ~/.bash_profile or ~/.bash_login
# exists.
# see /usr/share/doc/bash/examples/startup-files for examples.
# the files are located in the bash-doc package.
# the default umask is set in /etc/profile; for setting the umask
# for ssh logins, install and configure the libpam-umask package.
#umask 022
# if running bash
if [ -n "$BASH_VERSION" ]; then
# include .bashrc if it exists
if [ -f "$HOME/.bashrc" ]; then
. "$HOME/.bashrc"
fi
fi
# set PATH so it includes user's private bin if it exists
if [ -d "$HOME/bin" ] ; then
PATH="$HOME/bin:$PATH"
fi
# set PATH so it includes user's private bin if it exists
if [ -d "$HOME/.local/bin" ] ; then
PATH="$HOME/.local/bin:$PATH"
fi
echo "每次登录自动执行脚本 ✅"
bash /home/pi/Desktop/ip-program.sh
