linux shell循环：for、while、until用法详解_linux shell_

 #!/bin/bash #Author:wangjun #Contact QQ:183530300 #Version:1.0 #Create time:2016-08-17 16:53:28 #Description:1-100 all positive integer's sum declare -i sum=0 for I in {1..100};do let sum+=$I done echo "1-100 all positive integer's sum : $sum"

 #!/bin/bash #Author:wangjun #Contact QQ:183530300 #Version:1.0 #Create time:2016-08-17 11:25:37 #Description:ping all hosts and count the number declare -i online=0 declare -i offline=0 declare -i host=1 for host in `seq 254`;do ping -c 1 -W 1 10.1.250.$host &> /dev/null && echo "10.1.250.$host is online" && let online=$online+1 || let offline++ done echo "Online hosts number : $online" echo "Offline hosts number : $offline"

 #!/bin/bash #Author:wangjun #Contact QQ:183530300 #Version:1.0 #Create time:2016-08-17 17:27:45 #Description:random number comparative minrandom=$RANDOM maxrandom=$minrandom echo $minrandom for I in {1..9};do RD=$RANDOM echo $RD if [[ $RD -gt $maxrandom ]];then maxrandom=$RD elif [[ $RD -lt $minrandom ]];then minrandom=$RD fi done echo "Minrandom is : $minrandom" echo "Maxrandom is : $maxrandom"

 #!/bin/bash #Author:wangjun #Contact QQ:18353030 #Version:1.0 #Create time:2016-08-16 13:07:40 #Description:99 multiplication table for Row in {1..9};do for Column in `seq $Row`;do echo -ne "${Column}x${Row}=$[$Row*$Column]\t" done echo done

 #!/bin/bash #Author:wangjun #Contact QQ:183530300 #Version:1.0 #Create time:2016-08-18 11:35:16 #Description:multiplication table for ((row=1;row<=9;row++));do for ((column=1;column<=$row;column++));do echo -ne "${column}x${row}=$[${column}*${row}]\t" done echo done

 [root@centos6mini app]# echo {1..10} 1 2 3 4 5 6 7 8 9 10 [root@centos6mini app]# echo $(seq 1 10) 1 2 3 4 5 6 7 8 9 10

 #!/bin/bash > /root/user.log for i in {1..10};do #创建十个用户 useradd user$i && echo user$i is created #随机生成密码 password=$(cat /dev/urandom |tr -dc '0-9a-zA-Z!@_#?.,' |head -c 16) #将用户和密码导出 echo user$i:$password >> /root/user.log #设置密码 echo $password |passwd --stdin user$i &> /dev/null #强制下次登录修改密码 passwd -e user$i &> /dev/null done

 for ((i=1;i<10;i++)) do for ((j=1;j<=i;j++)) do echo -n "♥" done echo done for ((i=1;i<9;i++)) do for ((j=9;j>i;j--)) do echo -n "♥" done echo done ♥ ♥♥ ♥♥♥ ♥♥♥♥ ♥♥♥♥♥ ♥♥♥♥♥♥ ♥♥♥♥♥♥♥ ♥♥♥♥♥♥♥♥ ♥♥♥♥♥♥♥♥♥ ♥♥♥♥♥♥♥♥ ♥♥♥♥♥♥♥ ♥♥♥♥♥♥ ♥♥♥♥♥ ♥♥♥♥ ♥♥♥ ♥♥ ♥

 #!/bin/bash2 read -p "请输入三角形的高度: " num for i in `seq $num`;do for x in `seq 1 $[$num-$i]`;do echo -e " \c" done for n in `seq 1 $[2*$i-1]`;do #yanse=`tr -dc '1-6' < /dev/urandom | head -c 1` #echo -e "\e[3"$yanse"m♥\e[0m\c" echo -e "\e[34m♥\e[0m\c" done echo done ♥ ♥♥♥ ♥♥♥♥♥ ♥♥♥♥♥♥♥

 #!/bin/bash for ((i = 1; i < 10; i++)) do for ((j = 10; j > i; j--)) do echo -n " "; done for ((m = 1; m <= i; m++)) do echo -n "$i " done echo "" done [root@centos7 ~]# ./sjx 1 2 2 3 3 3 4 4 4 4 5 5 5 5 5 6 6 6 6 6 6 7 7 7 7 7 7 7 8 8 8 8 8 8 8 8 9 9 9 9 9 9 9 9 9

 #!/bin/bash #彩色闪烁山角形 read -p "请输入三角形边长： " w for (( i=1;i<=$w;i++ )); do for(( j=$w;j>$i;j-- ));do echo -n " " done for (( m=1;m<=i;m++ ));do we=`cat /dev/urandom |tr -dc '1-6' |head -c 1 ` echo -e "\033[3"$we";5m♥\033[0m\c" #红色加闪烁 done echo done

 #！/bin/bash > /root/user.log for i in {1..10};do useradd user$i && echo user$i is created pass=$(cat /dev/urandom |tr -dc '0-9a-zA-Z!@_#?.,' |head -c 16) #生成随机数 echo user$i:---pass:$pass >> /root/user.log echo $pass |password --stdin user$i &> /dev/null done

 #!/bin/bash for i in $(ls /etc/rc.d/rc3.d/);do #查看文件内容确定循环次数 if [[ $i =~ ^K.* ]];then echo "$i stop" elif [[ $i =~ ^S.* ]];then echo "$i start" fi done [root@centos6mini app]# ./linshi K05wdaemon stop K10saslauthd stop K15htcacheclean stop K15httpd stop K30spice-vdagentd stop K50dnsmasq stop K50kdump stop K73winbind stop K74ntpd stop ...省略...

 #!/bin/bash read -p "请输入一个正整数" s w=0 if [[ "$s" =~ ^[0-9]+$ ]] ;then for i in $(seq 1 $s) ;do w=$[$w+$i] done echo "整数1到$s的和为$w" else echo "请输入正整数" fi

 #!/bin/bash for i in {3..100..3};do #步进，相加 n=$[$n+$i] &> /devnull done echo $n

 #!/bin/bash sum=0 for n in $(seq 1 100);do i=$[$n/3] #进行相除 y=$[3*$i] #进行相乘 、运算成功则成立 if [ $y -eq $n ];then sum=$[$n+$sum] fi done echo $sum

 sum=0 for i in {1..100};do if [ $[$i%3] -eq 0 ];then #相除取余进行判定 let sum+=$i #进行加法运算 fi done echo $sum

 for (( i=1 ;i<=9;i++ ));do for ((n=1;n<=9;n++)) ;do w=0 w=$[$n*$i] if [ $n -le $i ];then echo -n " $i*$n=$w " fi done echo done

 #!/bin/bash cd /testdir &> /dev/null if [ ! $(echo $?) -eq 0 ] ;then #判断文件是否存在 mkdir /testdir &> /dev/null fi for i in $(seq 1 10 );do w=$(cat /dev/urandom |tr -dc '0-9a-zA-Z!@_#?.,' |head -c 8) touch $i$w.html done

 if ! [ -d /testdir ];then #判断文件是否存在 mkdir /testdir &> /dev/null #如果没有创建文件 fi for i in {1..10};do touch /testdir/$i`cat /dev/urandom |tr -dc [:alpha:] |head -c 8`.html #创建文件 done

 [root@centos6mini zuoye]# cat 11.sh #!/bin/bash > /root/ip.log for i in {250
                
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