Use shell script to implement automatic backup of source files before VI/CP/MV

The following script backs up all the source files to be edited into the/bak directory, and all path locations remain unchanged, such as Vii/etc/hosts, and the/etc/hosts is copied to/bak/etc/hosts.

# CAT/SH/VII

#!/usr/bin/bash

#判断源文件是否存在, exist to perform a backup operation

If [F "$"];then

#创建函数, you can implement any key to continue

#如果你的机器上不认stty Raw, then replace the two occurrences of raw in the function with Cbreak

Get_char ()

{

Savedstty= ' Stty-g '

Stty-echo

Stty Raw

DD If=/dev/tty Bs=1 count=1 2>/dev/null

Stty-raw

Stty Echo

Stty $SAVEDSTTY

}

#创建备份的根路径/bak, and let everyone have write permission

if [!-d "/bak"];then

Mkdir/bak

chmod A+w/bak

Fi

#判断目标文件所处的路径并创建, let everyone have write permission on a newly created directory of any level

echo $ | grep "/" >/dev/null

If ["' Echo $? '" = "0"];then

CD ${1%/*}

Fi

pwdnow= ' pwd '

Path=/bak${pwdnow}

#echo $path

if [!-d "$path"];then

Mkdir-p $path

patha=${pwdnow#/}

Chmod-r a+w/bak/${patha%%/*}

Fi

#复制目标文件

datenow= ' Date +%y%m%d '

timenow= ' Date +%h%m%s '

/USR/BIN/CP $ ${path}/${1##*/}.${datenow}.${timenow}

echo "Target" File "$"

has been copied to ${path}/${1##*/}.${datenow}.${timenow} "

echo "Now going to" VI $ ", press any key to continue ..."

Char= ' Get_char '

Fi

#调用vi命令

VI $

Calling script

# chmod A+X/SH/VII

#/SH/VII/ETC/PASSWD

You can add/sh to the path variable, which is more convenient.

Similarly, it is best to back up the target file when it comes to CP/MV commands to avoid accidental overwriting.