101个脚本之建立linux回收站的脚本

众所周知，linux是没有回收站的，一些人很害怕删错东西（有经验的linux管理员极少范这错误），个人不建议回收站，而应该是培养个人的安全意识。有点小跑题。
接着回来101个脚本之#15 Archiving Files As They're Removed 就是建立一个linux回收站的脚本

#!/bin/sh

# newrm, a replacement for the existing rm command, provides a
 # rudimentary unremove capability by creating and utilizing a new
 # directory within the user's home directory. It can handle directories
 # of content as well as individual files, and if the user specifies
 # the -f flag files are removed and NOT archived.

# Big Important Warning: You'll want a cron job or something similar to keep
 # the trash directories tamed. Otherwise nothing will ever actually
 # be deleted from the system and you'll run out of disk space!

mydir="$HOME/.deleted-files"
 realrm="/bin/rm"
 copy="/bin/cp -R"

if [ $# -eq 0 ] ; then # let 'rm' ouptut the usage error
 exec $realrm # our shell is replaced by /bin/rm
 fi

# Parse all options looking for '-f'

flags=""

while getopts "dfiPRrvW" opt
 do
 case $opt in
 f) exec $realrm "$@" ;; # exec lets us exit this script directly.
 *) flags="$flags -$opt" ;; # other flags are for 'rm', not us
 esac
 done
 shift $(($OPTIND - 1))

# Make sure that the $mydir exists

if [ ! -d $mydir ] ; then
 if [ ! -w $HOME ] ; then
 echo "$0 failed: can't create $mydir in $HOME" >&2
 exit 1
 fi
 mkdir $mydir
 chmod 700 $mydir # a little bit of privacy, please
 fi

for arg
 do
 newname="$mydir/$(date "+%S.%M.%H.%d.%m").$(basename "$arg")"
 if [ -f "$arg" ] ; then
 $copy "$arg" "$newname"
 elif [ -d "$arg" ] ; then
 $copy "$arg" "$newname"
 fi
 done

exec $realrm $flags "$@" # our shell is replaced by realrm

我们来说下这个脚本的实现思路
将原本的rm命令用我们这个带有回收站机制的myrm脚本代替（alias别名），脚本将要删除的文件移动到了home下个人目录中以.deleted-files 命名的隐藏文件夹。

接着我们看看这个脚本是怎么实现的

while getopts "dfiPRrvW" opt
 do
 case $opt in
 f) exec $realrm "$@" ;; # exec lets us exit this script directly.
 *) flags="$flags -$opt" ;; # other flags are for 'rm', not us
 esac
 done

这一段说明 要是命令用带 �Cf 选项的话，则不进回收站，调用原本的rm命令。

for arg
 do
 newname="$mydir/$(date "+%S.%M.%H.%d.%m").$(basename "$arg")"
 if [ -f "$arg" ] ; then
 $copy "$arg" "$newname"
 elif [ -d "$arg" ] ; then
 $copy "$arg" "$newname"
 fi
 done

用for循环顺序处理参数
newname="$mydir/$(date "+%S.%M.%H.%d.%m").$(basename "$arg")" 回收站里文件命名.