Loop of shell scripts: repeating commands

Loop of shell scripts: repeating commands

1.for Cycle

Grammar:

For variable name in variable Value list

Do

Command

Done

For based on the contents of the variable Value list, executes the command repeatedly until all the contents of the Variable Value column have been evaluated and finished.

Type of Value list: can be a specific text file, command generation list

Case:

VI User.txt

Zsan

Lisi

: Wq

VI useradd_for.sh

#!/bin/bash

un=$ (Cat/root/bin/user.txt)

For I in $Un

Do

Useradd $i

echo 123123 |passwd--stdin $i

Done

: Wq

chmod +x useradd_for.sh

./useradd_for.sh

Case: Checking for surviving hosts on the network

VI chk_net_alive_host.sh

#!/bin/bash

Read-p "Your want chk Net:" Net

For I in $ (SEQ 1 254)

Do

Ping-c 2 $NET. $i &&echo "$NET. $i are up."

Done

Case: Setting up the boot service

VI chk_ser_onboot_for.sh

#!/bin/bash

sl=$ (Cat/root/bin/ck.list)

For I in $SL

Do

/etc/init.d/$i status |grep PID

If [$?-ne 0];then

/etc/init.d/$i Restart

Fi

Chkconfig $i on

Done

VI ck.list

AUDITD # #审计服务

Blk-availability # #块设备管理服务

Crond # #计划任务

dhcpd

gpm

Iptables # #iptables防火墙

Lvm2-monitor # #lvm的管理服务

Named # #dns服务

Network # #网络

NTPD # #时间服务器

Postfix # #邮件服务

Rsyslog # #系统日志服务

SSHD # #远程连接

Udev-post # #udev硬件管理服务

XINETD # #超级服务, CVS,TFTPD and other small service Manager

For value list extension: Sequence list, array list

Sequence list:

VI for_list.sh

#!/bin/bash

Fl={vsftpd,dhcpd,named}

For I in $FL

Do

/etc/init.d/$i Restart

Chkconfig $i on

Done

For i in {1..254}

Do

Ping-c 2 192.168.10. $i &>/dev/null

Done

Array list:

VI for-arry.sh

#!/bin/bash

A= (crond gpm iptables lvm2-monitor network rsyslog sshd udev-post)

Echo ${a[1]}

Echo ${a[5]}

echo A arry length is ${#A [*]}

For i in ${a[*]};d o

Chkconfig--list $i

Done

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Loop of shell scripts: repeating commands