#!/bin/sh if [ $# -ne 1 ]then echo "agrc is error" exitfi if [ -f $1 ]then echo "this is file"fi if [ -d $1 ]then echo "this is dirctory"fi

#!/bin/sh if [ $# -ne 3 ]then echo "please input 3 argument" exitfi  case $2 in +)  echo "`expr $1 + $3`"  ;; -)  echo "`expr $1 - $3`"  ;; \*)  echo "`expr $1 \* $3`"  ;; /)  echo "`expr $1 / $3`" 

#!/bin/sh if [ $# -ne 1 ]then echo please input 1 argument exitfi if [  -d $HOME/$1 ]then echo dirctory is exsit, copying...else mkdir $HOME/$1fi flist=`ls`for file in $flistdo cp $file $HOME/$1don

1、{} 大括号： 用法一：通配符扩展 eg: ls my_{finger,toe}s 这条命令相当于如下命令的组合： ls my_fingers my_toes eg: mkdir {userA,userB,userC}-{home,bin,data}

#!/bin/sh check_user(){ user=`who | cut -f1 -d ' '` for name in $user do  if [ $name = $1 ]  then   return 1  else   return 0  fi done} while truedo echo "input user name:\c" read name check_user $n

#!/bin/sh  tput1(){ line=`tput lines` cols=`tput cols`  tput clear  tput cup 0 0 echo "left-top\c"  tput cup 0 `expr $cols - 9` echo "right-top\c"  tput cup $line 0 echo "left-bottom\c"  tput cu

#!/bin/sh  echo "Input date with format yyyy mm dd:\c"read year month dayecho "Today is $year/$month/$day, right"echo "press enter to confirm and continue\c"read aecho "I know the date, bye"   注释：