select
#!/bin/bash echo "What is your favourite color? " select color in "red" "blue" "green" "white" "black" do break done echo "You have selected $color"
2.case
#!/bin/bash echo "please select C to Copy,D to Delete,B to Backup" read op case $op in C) echo "your select is Copy" ;; D) echo "your select is Delete" ;; B) echo "your select is Backup" ;; *) echo "invalid select" esac
3.select case
#!/bin/bash #test select and case echo "a is 5,b is 3,choose one option to calc" a=5 b=3 select op in "a+b" "a-b" "a*b" "a/b" do break done case $op in "a+b") echo 'a+b=' `expr $a "+" $b`;; "a-b") echo 'a-b=' `expr $a "-" $b`;; "a*b") echo 'a*b=' `expr $a "*" $b`;; "a/b") echo 'a/b=' `expr $a "/" $b`;; *) echo "input error" esac
4.for
#!/bin/bash #test for for DAY in MONDAY TUESDAY WENSDAY THUHTHDAY FRIDAY SATARDAY SUNDAY do echo "the day is $DAY" done
for...pkill踢已经登录的用户
#!/bin/sh # test for to kill process username="$1" ps aux | grep $username | awk '{ print $2 }' > /tmp/temp.pid killid=`cat /tmp/temp.pid` for PID in $killid do /bin/kill -9 $PID 2> /dev/null done
5.until
#!/bin/bash #test until until [ -x /home/shell/aa.sh ] do /bin/ls -l /usr exit 0 done
read ....until
#!/bin/bash echo "please input y or Y" read input until [ "$input" = "Y" ] || [ "$input" = "y" ] do echo "error input ,please try again..." read input done echo "Stop hear"
6.shift
#!/bin/bash if [ $# -le 0] then echo "no enough parameters" exit 0 fi sum=0 while [ $# -gt 0 ] do sum=`expr $sum + $1 ` shift done echo $sum
7.while
#!/bin/bash # test while while [ -d /etc ] do ls -l /etc break done
while....calc
#!/bin/bash num=1 while [ $num -le 10 ] do SUM=`expr $num "*" $num` echo $SUM num=`expr $num "+" 1` done
8.break和continue
#!/bin/bash echo "please select C to Copy,D to Delete,B to Backup" while true do read op case $op in C) echo "your select is Copy" ;; D) echo "your select is Delete" ;; B) echo "your select is Backup" ;; E) echo "exit......." break ;; *) echo "invalid select" continue esac done
9.批量添加用户
#!/bin/bash #test batch add user #/etc/passwd echo "please input username" read name echo "please input num" read num n=1 while [ $n -le $num ] do /usr/sbin/useradd $name$n n=`expr $n "+" 1` done #/etc/shadow echo "please input password" read passwd m=1 while [ $m -le $num ] do echo $passwd | passwd --stdin $name$m m=`expr $m + 1` done10.批量删除用户
#!/bin/bash #delete users echo "please input username" read name echo "please input num" read num sum=0 while [ $sum -lt $num ] do sum=`expr $sum + 1` /usr/sbin/userdel -r $name$sum done
11.输入用户名，显示用户的状态
#!/bin/sh # display user's info /bin/echo "please input username" read username /bin/grep $username /etc/passwd > /dev/null 2> /dev/null if [ $? -eq 0 ] then echo "username is $username" else echo "$username is not exist!" exit 1 fi /bin/echo #list passwd info userinfo=`/bin/grep ^$username:x /etc/passwd` userid=`/bin/echo $userinfo | awk -F : '{print $3}'` groupid=`/bin/echo $userinfo | awk -F : '{print $4}'` homedir=`/bin/echo $userinfo | awk -F : '{print $6}'` shell=`/bin/echo $userinfo | awk -F : '{print $7}'` #get group name from GID grouptmpname=`cat /etc/group | /bin/grep :x:$groupid` groupname=`/bin/echo $grouptmpname | awk -F : '{print $1}'` echo "user id is :$userid" echo "default group is $groupname" echo "home directory is $homedir" echo "shell is $shell" echo "group members info:" # get grop members groups=`/usr/bin/groups $username` /bin/echo $groups /bin/echo #get login info userlogin=`/usr/bin/who | /bin/grep $username` if [ "$userlogin" != "" ] then echo "$username is online!" else echo "$username is not logged in" fi
12.输入参数比较大小
#!/bin/sh if [ $# -ne 2 ]; then "only allowed 2 parameters!" exit 0 fi if [ $1 -eq $2 ]; then echo "$1=$2" elif [ $1 -lt $2 ] ; then echo "$1<$2" elif [ $1 -gt $2 ]; then echo "$1>$2" fi
13.函数，函数中没有局部变量，只有全局变量。
#!/bin/bash HELP(){ echo "useage: sh function \$1 \$2 \$3" } if [ $# -ne 3 ] then HELP else echo "thank for you input,the three argument is 1 2 3" fi
