运维Shell脚本小试牛刀(一)



运维Shell脚本小试牛刀(一)

运维Shell脚本小试牛刀(二)





一: Shell中循环剖析 for 循环.......

#!/bin/bash -

#==================================================================================================================

FILE: countloop.sh

USAGE: ./countloop.sh

DESCRIPTION:

OPTIONS: -------

REQUIREMENTS: ---------

BUGS: ------

NOTES: --------

AUTHOR: ---------YangGe (TOM) ,YangGe.freedom@icloud.com

ORGANIZATION:

CREATED: 2023-8-24 09:11:20

REVISION: --------

#====================================================================================================================

for i in 1 2 3 4 5 6 #循环1~6

do

echo "Thre for loop is run $i times."

done

echo "==============================================================================================================="

for linux in Debian Redhat Suse Fedora Centos7 Ubunto

do

echo "current out system is ${linux}....."

done

echo "================================================================================================================"



#!/bin/bash -

#==================================================================================================================

FILE: orcmdssub.sh

USAGE: ./forcmdssub.sh

DESCRIPTION:

OPTIONS: -------

REQUIREMENTS: ---------

BUGS: ------

NOTES: --------

AUTHOR: ---------YangGe (TOM) ,YangGe.freedom@icloud.com

ORGANIZATION:

CREATED: 2023-8-24 09:11:20

REVISION: --------

#====================================================================================================================

echo "Printing file list in /etc directory........"

for file in `ls /etc/*`

do

echo "current print file is: $file"

done



#!/bin/bash -

#==================================================================================================================

FILE: forcmdssub.sh

USAGE: ./forcmdssub.sh

DESCRIPTION:

OPTIONS: -------

REQUIREMENTS: ---------

BUGS: ------

NOTES: --------

AUTHOR: ---------YangGe (TOM) ,YangGe.freedom@icloud.com

ORGANIZATION:

CREATED: 2023-8-24 09:11:20

REVISION: --------

#====================================================================================================================

echo "Printing file list in /etc directory........"

for file in `ls /etc/*`

do

echo "current print file is: $file"

done

[root@www shelldic]# cat forvarscoutents.sh

#!/bin/bash -

#==================================================================================================================

FILE: forvarscoutents.sh

USAGE: ./forvarscoutents.sh

DESCRIPTION:

OPTIONS: -------

REQUIREMENTS: ---------

BUGS: ------

NOTES: --------

AUTHOR: ---------YangGe (TOM) ,YangGe.freedom@icloud.com

ORGANIZATION:

CREATED: 2023-8-24 09:11:20

REVISION: --------

#====================================================================================================================

filenames="/etc/my.cnf /etc/vconsole.conf /etc/rsyncd.conf /etc/sestatus.conf /usr/local/rs.conf"

上面的文件名以空格分割

for file in $filenames

do

[ -f $file ] && echo "The file $file was found.." || echo "***** ERROR: The file $file was missing.....*******"

如果是文件,则打印文件存在,如果不存在则打印丢失

done



#!/bin/bash -

#==================================================================================================================

FILE: simplenestedfor.sh

USAGE: ./simplenestedfor.sh

DESCRIPTION:

OPTIONS: -------

REQUIREMENTS: ---------

BUGS: ------

NOTES: --------

AUTHOR: ---------YangGe (TOM) ,YangGe.freedom@icloud.com

ORGANIZATION:

CREATED: 2023-8-24 09:11:20

REVISION: --------

#====================================================================================================================

for (( i = 0; i < 30; i++ )) #外循环

do

for (( j=0; j<160; j++ )) # 内循环

do

echo -n "* " #

done

echo "" #

done




二 : while循环



#!/bin/bash -

#==================================================================================================================

FILE: whichreadfile.sh

USAGE: ./whichreadfile.sh

DESCRIPTION:

OPTIONS: -------

REQUIREMENTS: ---------

BUGS: ------

NOTES: --------

AUTHOR: ---------YangGe (TOM) ,YangGe.freedom@icloud.com

ORGANIZATION:

CREATED: 2023-8-24 09:11:20

REVISION: --------

#====================================================================================================================

file=$1 # 将位置参数1的值赋值给变量file

if [ $# -lt 1 ];then # 如果脚本未指定参数,则打印使用方法并退出运行

echo "Usage: $0 FILEPATH"

exit

fi

while read -r line # 使用read命令从标准输入读取文件的一行,并赋值给变量line

do

echo $line # 打印读取的行

done < "$file"


[root@www shelldic]# cat whilereadfile.sh

#!/bin/bash -

#==================================================================================================================

FILE: whichreadfile.sh

USAGE: ./whichreadfile.sh

DESCRIPTION:

OPTIONS: -------

REQUIREMENTS: ---------

BUGS: ------

NOTES: --------

AUTHOR: ---------YangGe (TOM) ,YangGe.freedom@icloud.com

ORGANIZATION:

CREATED: 2023-8-24 09:11:20

REVISION: --------

#====================================================================================================================

file=$1 # 将位置参数1的值赋值给变量file

if [ $# -lt 1 ];then # 如果脚本未指定参数,则打印使用方法并退出运行

echo "Usage: $0 FILEPATH"

exit

fi

while read -r line # 使用read命令从标准输入读取文件的一行,并赋值给变量line

do

echo $line # 打印读取的行

done < "$file"

输出测试:

[root@www shelldic]#./whilereadfile.sh /etc/sudo.conf

Default /etc/sudo.conf file

Format:

Plugin plugin_name plugin_path plugin_options ...

Path askpass /path/to/askpass

Path noexec /path/to/sudo_noexec.so

Debug sudo /var/log/sudo_debug all@warn

Set disable_coredump true

Sudo plugins:

The plugin_path is relative to ${prefix}/libexec unless fully qualified.

The plugin_name corresponds to a global symbol in the plugin

that contains the plugin interface structure.

The plugin_options are optional.

The sudoers plugin is used by default if no Plugin lines are present.

Plugin sudoers_policy sudoers.so

Plugin sudoers_io sudoers.so

Sudo askpass:

An askpass helper program may be specified to provide a graphical

password prompt for "sudo -A" support. Sudo does not ship with its

own passpass program but can use the OpenSSH askpass.

Use the OpenSSH askpass

#Path askpass /usr/X11R6/bin/ssh-askpass

Use the Gnome OpenSSH askpass

#Path askpass /usr/libexec/openssh/gnome-ssh-askpass

Sudo noexec:

Path to a shared library containing dummy versions of the execv(),

execve() and fexecve() library functions that just return an error.

This is used to implement the "noexec" functionality on systems that

support C<LD_PRELOAD> or its equivalent.

The compiled-in value is usually sufficient and should only be changed

if you rename or move the sudo_noexec.so file.

#Path noexec /usr/libexec/sudo_noexec.so

Core dumps:

By default, sudo disables core dumps while it is executing (they

are re-enabled for the command that is run).

To aid in debugging sudo problems, you may wish to enable core

dumps by setting "disable_coredump" to false.

Set to false here so as not to interfere with /proc/sys/fs/suid_dumpable

Set disable_coredump false

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