# 查看用户主目录下的配置文件
$ ls -la ~ | grep bash
-rw——-. 1 user user 1234 Apr 3 13:30:00 .bash_history
-rw-r–r–. 1 user user 234 Jan 1 00:00:00 .bash_logout
-rw-r–r–. 1 user user 567 Jan 1 00:00:00 .bash_profile
-rw-r–r–. 1 user user 3456 Jan 1 00:00:00 .bashrc

# 查看各配置文件内容
$ cat ~/.bash_profile
# .bash_profile

# Get the aliases and functions
if [ -f ~/.bashrc ]; then
. ~/.bashrc
fi

# User specific environment and startup programs

PATH=$PATH:$HOME/.local/bin:$HOME/bin

export PATH

$ cat ~/.bashrc
# .bashrc

# Source global definitions
if [ -f /etc/bashrc ]; then
. /etc/bashrc
fi

# User specific aliases and functions
alias ll=’ls -la’
alias la=’ls -A’
alias l=’ls -CF’

$ cat ~/.bash_logout
# ~/.bash_logout: executed by bash(1) when login shell exits.

# when leaving the console clear the screen to increase privacy

if [ “$SHLVL” = 1 ]; then
[ -x /usr/bin/clear_console ] && /usr/bin/clear_console -q
fi

# 编辑.bashrc文件添加环境变量
$ vi ~/.bashrc

# 在.bashrc文件末尾添加以下内容
# User Environment Variables
export EDITOR=vim
export VISUAL=vim
export HISTSIZE=10000
export HISTFILESIZE=20000
export HISTTIMEFORMAT=”%F %T ”

# Custom PATH
export PATH=$PATH:$HOME/bin:$HOME/.local/bin

# 重新加载.bashrc文件
$ source ~/.bashrc

# 验证环境变量
$ echo $EDITOR
vim

$ echo $VISUAL
vim

$ echo $HISTSIZE
10000

$ echo $HISTTIMEFORMAT
%F %T

# 编辑.bash_profile文件添加环境变量
$ vi ~/.bash_profile

# 在.bash_profile文件末尾添加以下内容
# User Environment Variables (Login Shell)
export USER_VAR=”user_value”
export APP_HOME=/opt/myapp
export PATH=$PATH:$APP_HOME/bin

# 重新登录验证
$ exit
$ ssh user@localhost
$ echo $USER_VAR
user_value

$ echo $APP_HOME
/opt/myapp

# 查看系统级配置文件
$ ls -la /etc/profile*
-rw-r–r–. 1 root root 1234 Jan 1 00:00:00 /etc/profile
-rw-r–r–. 1 root root 567 Jan 1 00:00:00 /etc/profile.d/

# 查看/etc/profile文件内容
$ cat /etc/profile
# /etc/profile

# System wide environment and startup programs, for login setup
# Functions and aliases go in /etc/bashrc

# It’s NOT a good idea to change this file unless you know what you
# are doing. It’s much better to create a custom.sh shell script in
# /etc/profile.d/ to make custom changes to your environment, as such
# changes will be preserved when upgrading.

# Prevent double sourcing in case profile is invoked directly
if [ -n “$BASH_VERSION” ]; then
if [ -f /etc/bashrc ]; then
. /etc/bashrc
fi
fi

# Path manipulation
if [ “$EUID” = “0” ]; then
pathmunge /usr/sbin
pathmunge /usr/local/sbin
else
pathmunge /usr/local/sbin after
pathmunge /usr/sbin after
fi

HOSTNAME=$(/usr/bin/hostnamectl –static 2>/dev/null)
HISTSIZE=1000
if [ “$HISTCONTROL” = “ignorespace” ] ; then
export HISTCONTROL=ignoreboth
else
export HISTCONTROL=ignoredups
fi

export PATH HOSTNAME HISTSIZE HISTCONTROL

# By default, we want umask to get set. This sets it for login shell
# Current threshold for system reserved uid/gids is 200
# You could check uidgid reservation validity in
# /usr/share/doc/setup-*/uidgid file
if [ $UID -gt 199 ] && [ “`/usr/bin/id -gn`” = “`/usr/bin/id -un`” ]; then
umask 002
else
umask 022
fi

for i in /etc/profile.d/*.sh /etc/profile.d/sh.local ; do
if [ -r “$i” ]; then
if [ “$PS1” ]; then
. “$i”
else
. “$i” >/dev/null
fi
fi
done

unset i
unset -f pathmunge

# 查看profile.d目录下的配置文件
$ ls /etc/profile.d/
colorgrep.csh
colorgrep.sh
colorls.csh
colorls.sh
less.csh
less.sh
vim.csh
vim.sh