示例：找出ID号为偶数的用户，显示其用户名、ID及默认shell #!/bin/bash # while read line; do userid=$(echo $line | cut -d: -f3) username=$(echo $line | cut -d: -f1) usershell=$(echo $line | cut -d: -f7) if [ $[$userid%2] -eq 0 ]; then echo "$username, $userid, $usershell." fi done < /etc/passwd

untilCONDITION; do 循环体 循环控制变量修正表达式 done进入条件：CONDITION测试为 假 退出条件：CONDITION测试为 真

示例：求100以内的正整数之和 #!/bin/bash # declare -i sum=0 declare -i i=1until [ $i -gt 100 ]; do let sum+=$i let i++ doneecho $sum

vim 的配置文件是：/etc/vimrc 可以对此配置文件进行编辑，添加配置： set tabstop=4 ，重读配置，使文件生效即可。如下： [root@LeeMumu ~]# vi /etc/vimrc# 编辑 vim 的配置文件 set tabstop=4 [root@LeeMumu ~]# source /etc/vimrc# 重读配置文件。使文件生效

[root@LeeMumu ~]# ./sUMID.sh Add user user21 successfully. The user user21 ID is:1004. Add user user22 successfully. The user user22 ID is:1005. Add user user33 successfully. The user user33 ID is:1006. The sum of these UserID is:3015. [root@LeeMumu ~]# tail -n 3 /etc/passwd user21:x:1004:1017::/home/user21:/bin/bash user22:x:1005:1018::/home/user22:/bin/bash user33:x:1006:1019::/home/user33:/bin/bash [root@LeeMumu ~]# cat sUMID.sh #!/bin/bash # declare -i sum=0for i in user21 user22 user33; do if id $i &> /dev/null ; then echo "The user $i exists." else useradd $i echo "Add user $i successfully." fi ID=`grep "^$i" /etc/passwd | cut -d":" -f3` #ID=$(grep "^$i" /etc/passwd | cut -d":" -f3)# 用 $() 或 `` 都可以 echo "The user $i ID is:$ID. " sum=$[$sum+$ID] done echo "The sum of these UserID is:$sum."

#!/bin/bash # file1_lines=$(grep "^$" $1 | wc -l) file2_lines=$(grep "^$" $2 | wc -l)echo "Total blank lines: $[$file1_lines+$file2_lines]"

第一种： #!/bin/bash # if ! grep "^$1\>" /etc/passwd &> /dev/null; then useradd $1 echo $1 | passwd --stdin $1 &> /dev/null echo "Add user $1 finished." fi 第二种： #!/bin/bash # if [ $# -lt 1 ]; then echo "At least one username." exit 2 fiif ! grep "^$1\>" /etc/passwd &> /dev/null; then useradd $1 echo $1 | passwd --stdin $1 &> /dev/null echo "Add user $1 finished." fi第三种： #!/bin/bash # if [ $# -lt 1 ]; then echo "At least one username." exit 2 fiif grep "^$1\>" /etc/passwd &> /dev/null; then echo "User $1 exists." else useradd $1 echo $1 | passwd --stdin $1 &> /dev/null echo "Add user $1 finished." fi

第一种： #!/bin/bash # if [ $# -lt 2 ]; then echo "Two integers." exit 2 fiif [ $1 -ge $2 ]; then echo "Max number: $1." else echo "Max number: $2." fi第二种：（相对于第一种来说，第二种是代码优化） #!/bin/bash # if [ $# -lt 2 ]; then echo "Two integers." exit 2 fideclare -i max=$1if [ $1 -lt $2 ]; then max=$2 fiecho "Max number: $max."第三种：（if 语句可嵌套） #!/bin/bash # if [ $# -lt 2 ]; then echo "TWO INTEGERS!" exit 1 else if [ $1 -lt $2 ]; then echo "The $2 is bigger than $1." elif [ $1 -eq $2 ]; then echo "The $1 is equal than $1." else echo "The $1 is bigger than $1." fi fi

#!/bin/bash # if [ $# -lt 1 ]; then echo "At least on path." exit 1 fiif ! [ -e $1 ]; then echo "No such file." exit 2 fiif [ -f $1 ]; then echo "Common file." elif [ -d $1 ]; then echo "Directory." elif [ -L $1 ]; then echo "Symbolic link." elif [ -b $1 ]; then echo "block special file." elif [ -c $1 ]; then echo "character special file." elif [ -S $1 ]; then echo "Socket file." else echo "Unkown." fi

#!/bin/bash # [ $# -lt 1 ] && echo "At least on user name." && exit 1! id $1 &> /dev/null && echo "No such user." && exit 2userid=$(id -u $1)if [ $userid -eq 0 ]; then echo "root" elif [ $userid -ge 1000 ]; then echo "login user." else echo "System user." fi

(1) 列出如下菜单给用户： disk) show disks info; mem) show memory info; cpu) show cpu info; *) quit; (2) 提示用户给出自己的选择，而后显示对应其选择的相应系统信息。

#!/bin/bash # cat << EOF cpu) display cpu information mem) display memory infomation disk) display disks information quit) quit =============================== EOFread -p "Enter your option: " optionwhile [ "$option" != "cpu" -a "$option" != "mem" -a "$option" != "disk" -a "$option" != "quit" ]; do echo "cpu, mem, disk, quit" read -p "Enter your option again: " option doneif [ "$option" == "cpu" ]; then lscpu elif [ "$option" == "mem" ]; then free -m elif [ "$option" == "disk" ]; then fdisk -l /dev/[hs]d[a-z] else echo "quit" exit 0 fi

第一个脚本： #!/bin/bash #计算100以内所有奇数的和以及所有偶数的和；分别显示之 #奇数和变量 let SUM1=0 #偶数和变量 let SUM2=0 for I in {1..100}; do if [ $[$I%2] -eq 0 ]; then SUM1=$[$SUM1+$I] else SUM2=$[$SUM2+$I] fi doneecho -e "SUM1=$SUM1\nSUM2=$SUM2"第二个脚本： #!/bin/bash # declare -i even=0 declare -i odd=0for i in {1..100}; do if [ $[$i%2] -eq 0 ]; then even=$[$even+$i] else odd=$[$odd+$i] fi doneecho "The sum of the even_number between 1 and 100 is: $even" echo "The sum of the odd_number between 1 and 100 is: $odd" echo "The sum of the integer between 1 and 100 is: $[$even+$odd]"

#!/bin/bash #declare -i passwd_Lines=`wc -l /etc/passwd | cut -d' ' -f1` declare -i sum_UID=0for i in `cat /etc/passwd | cut -d':' -f3`; do sum_UID=$[$sum_UID+$i] doneecho "The sum of the user-ID is:$sum_UID"

#!/bin/bash #declare -i count=0 declare -i line_count=0if [ $# -eq 1 ]; then if [ -d $1 ]; then for filename in $1* ; do if [ -f $filename ]; then line_count=$[$line_count+`wc -l $filename | cut -d' ' -f1`] count=$[$count+1] echo "The Common_File $filename has $line_count lines." else exit 1 fi done else echo -e "Please Input Correct Directory.\nFor Example: /path/path/" exit 2 fi else echo "Please Input One Directory!" exit 3 fi echo " " echo "The Number of Common_File is:$count" echo "The Total Lines of Common_File is:$line_count"

[root@LeeMumu ~]# bash sum1020.sh The UID OF the tenth user is: 11. The UID OF the twentith user is: 59. The UID_SUM OF the tenth user and the twentith user is: 70. [root@LeeMumu ~]# cat sum1020.sh #!/bin/bash # ID10=$(head -10 /etc/passwd | tail -1 | cut -d":" -f3) ID20=$(head -20 /etc/passwd | tail -1 | cut -d":" -f3)sum1020=$[$ID10+$ID20]echo "The UID OF the tenth user is: $ID10." echo "The UID OF the twentith user is: $ID20." echo "The UID_SUM OF the tenth user and the twentith user is: $sum1020."

[root@LeeMumu ~]# bash sumSPACElines.sh The /etc/rc.d/init.d/functions has 91 space-lines. The /etc/inittab has 0 space-lines. The /etc/rc.d/init.d/functions and /etc/inittab totally have 91 space-lines. [root@LeeMumu ~]# cat sumSPACElines.sh #!/bin/bash # ID10=$(grep "^[[:space:]]*$"/etc/rc.d/init.d/functions | wc -l) ID20=$(grep "^[[:space:]]*$"/etc/inittab | wc -l)sum1020=$[$ID10+$ID20]echo "The /etc/rc.d/init.d/functions has $ID10 space-lines." echo "The /etc/inittab has $ID20 space-lines." echo "The /etc/rc.d/init.d/functions and /etc/inittab totally have $sum1020 space-lines."

[root@LEEMUMU ~]# cat ping.sh #!/bin/bash #declare -i upnum=0 declare -i downnum=0 declare -i i=1pinghost() { if ping $1 -c 1 -W 1 &>/dev/null; then echo -e "\033[1; 32m$1 is up.\033[0m"| tee -a up20190717.txt upnum=$[$upnum+1] else echo -e "\033[1; 31m$1 is down.\033[0m"| tee -a down20190717.txt downnum=$[$downnum+1] fi }while [ $i -le 254 ]; do pinghost 172.16.141.$i let i++ doneecho "Uphost is $upnum." echo "Downhost is $downnum."

#!/bin/bash #cping() { local i=1 while [ $i -le 5 ]; do if ping -W 1 -c 1 $1.$i &> /dev/null; then echo "$1.$i is up" else echo "$1.$i is down." fi let i++ done }bping() { local j=0 while [ $j -le 5 ]; do cping $1.$j let j++ done }aping() { local x=0 while [ $x -le 255 ]; do bping $1.$x let x++ done }

[root@LeeMumu ~]# ./evenorodd.sh Please Input One UserName:JC9 The UserID Of JC9 is even! [root@LeeMumu ~]# ./evenorodd.sh Please Input One UserName:jc8 The jc8 Not Exist! Please Input Another UserName! [root@LeeMumu ~]# ./evenorodd.sh Please Input One UserName:JC6 The UserID Of JC6 is odd!

[root@LeeMumu ~]# cat evenorodd.sh #!/bin/bash # read -p "Please Input One UserName:" UserNameif ! id $UserName &> /dev/null; then echo -e "\e[1; 31mThe $UserName Not Exist!\e[0m" echo -e "\e[1; 32mPlease Input Another UserName!\e[0m" exit 1 else if [ $[`id -u $UserName`%2] -eq 0 ]; then echo -e "\e[1; 33mThe UserID Of $UserName is even!\e[0m" else echo -e "\e[1; 34mThe UserID Of $UserName is odd!\e[0m" fi fi

#!/bin/bash # 先定义函数，再引用函数 while_ping(){ local i=1 while [ $i -le 255 ]; do ping -W 1 -c 1 $1.$i &> /dev/null if [ $? == 0 ]; then echo "$1.$i is up" else echo "$1.$i is down" fi let i++ done }########################################################for_ping(){for i in {1..255}; do ping -W 1 -c 1 $1.$i &> /dev/null if [ $? == 0 ]; then echo "$1.$i is up" else echo "$1.$i is down" fi done }########################################################if [ $# -lt 2 ]; then echo "Usage sh $0 {for_ping|while_ping} Network" echo "Such as :for_ping 192.168.1 OR while_ping 192.168.1" exit 1 elif [[ $1 == "for_ping" ]]; then echo "for_ping" for_ping $2 elif [[ $1 == "while_ping" ]]; then echo "while_ping" while_ping $2 fi

#!/bin/bash for ip in ｛1..255｝；do ping -c 1 10.0.0.$ip > /dev/null 2>&1 if [ $? -eq 0 ]; then echo 10.0.0.$ip is UP else echo 10.0.0.$ip is DOWN fi done##############################################declare -i ip=1 while [ $ip -le 255 ]; do ping -c 1 10.0.0.$ip > /dev/null 2>&1 if [ $? -eq 0 ]; then echo 10.0.0.$ip UP else echo 10.0.0.$ip DOWN fi let ip++ done

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