bash脚本学习之一：ubuntu系统bash.bashrc走读注释

# System-wide .bashrc file for interactive bash(1) shells.
# To enable the settings / commands in this file for login shells as well,
# this file has to be sourced in /etc/profile.
# If not running interactively, don't do anything
# 如果字符串“$PS1”长度为0，则返回
# PS1为用户主提示符
[ -z "$PS1" ] && return
# check the window size after each command and, if necessary,
# update the values of LINES and COLUMNS.
#设置checkwinsize，checkwinsize
shopt -s checkwinsize
# set variable identifying the chroot you work in (used in the prompt below)
# 如果"$debian_chroot"为空 且 /etc/debian_chroot可读，则设置debian_chroot为/etc/debian_chroot的内容
if [ -z "$debian_chroot" ] && [ -r /etc/debian_chroot ]; then
debian_chroot=$(cat /etc/debian_chroot)
fi
# set a fancy prompt (non-color, overwrite the one in /etc/profile)
# u当前用户的用户名 $如果用户以root身份运行就显示#，否则就显示$
# w工作目录的路径名 h计算机的主要名，不包括域名
# ：内置空串，返回true
#
${parameter:+word}
#
Use
Alternate Value.
If parameter is null or unset, nothing is
#
substituted, otherwise the expansion of word is substituted.
PS1='${debian_chroot:+($debian_chroot)}u@h:w$ '
# Commented out, don't overwrite xterm -T "title" -n "icontitle" by default.
# If this is an xterm set the title to user@host:dir
#case "$TERM" in
#xterm*|rxvt*)
#
PROMPT_COMMAND='echo -ne "33]0;${USER}@${HOSTNAME}: ${PWD}07"'
#
;;
#*)
#
;;
#esac
# enable bash completion in interactive shells
#if [ -f /etc/bash_completion ] && ! shopt -oq posix; then
#
. /etc/bash_completion
#fi
# sudo hint
# -e 文件存在
if [ ! -e "$HOME/.sudo_as_admin_successful" ] && [ ! -e "$HOME/.hushlogin" ] ; then
case " $(groups) " in * admin *)
# -x 文件具有可执行权限
if [ -x /usr/bin/sudo ]; then
# << 表示Here文档
cat <<-EOF
To run a command as administrator (user "root"), use "sudo <command>".
See "man sudo_root" for details.
EOF
fi
esac
fi
# if the command-not-found package is installed, use it
# -o 为 布尔或运算符
# 如果 /usr/lib/command-not-found 或 /usr/share/command-not-found可执行，
if [ -x /usr/lib/command-not-found -o -x /usr/share/command-not-found ]; then
#function: function name { COMMANDS ; } or name () { COMMANDS ; }
#
Define shell function.
#
Create a shell function named NAME.
When invoked as a simple command,
#
NAME runs COMMANDs in the calling shell's context.
When NAME is invoked,
#
the arguments are passed to the function as $1...$n, and the function's
#
name is in $FUNCNAME.
#
Exit Status:
#
Returns success unless NAME is readonly.
function command_not_found_handle {
# check because c-n-f could've been removed in the meantime
if [ -x /usr/lib/command-not-found ]; then
/usr/bin/python /usr/lib/command-not-found -- "$1"
return $?
elif [ -x /usr/share/command-not-found ]; then
/usr/bin/python /usr/share/command-not-found -- "$1"
return $?
else
return 127
fi
}
fi

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