Shulou(Shulou.com)06/03 Report--

Write hello world scripts

#! / bin/bash

Echo "hello world"

Create Linux system account and password through location variable

#! / bin/bash

# $1 is the first parameter for executing the script, and $2 is the second parameter for executing the script

Useradd "$!"

Echo "$2" | passwd-- stdin "$2"

Use the tar command to back up all log files under / var/log every 5 days

# vim / root/logbak.sh

# write a backup script, and the file name after the backup contains a date label to prevent subsequent backups from overwriting the previous backup data

# Note that the date command needs to be enclosed in backquotes, which are above the keyboard keys

Tar-czf log-date +% Y%m%d.tar.gz / var/logcrontab-e # write scheduled tasks and execute backup scripts

00 03 5 / root/logbak.sh

One-click deployment of LNMP (RPM package version)

#! / bin/bash

# to install and deploy LNMP using yum, you need to configure the yum source in advance, otherwise the script will fail

# script for centos7.2 or RHEL7.2

Yum-y install httpd

Yum-y install mariadb mariadb-devel mariadb-server

Yum-y install php php-mysql

Systemctl start httpd mariadb

Systemctl enable httpd mariadb

Real-time monitor the local memory and the remaining space of the hard disk. The remaining memory is less than 500m and the remaining space of the root partition is less than 1000m.

Send an alarm email to the root administrator when

#! / bin/bash

# Author: Jacob

# extract the remaining space in the root partition

Disk_size=$ (df / | awk'/\ / {print $4}')

# extract the remaining memory space

Mem_size=$ (free | awk'/ Mem/ {print $4}')

While:

Do

# Note that the amount of memory and disk space extracted is in Kb.

If [$disk_size-le 512000-a $mem_size-le 1024000]; then

Mail-s Warning root / dev/null

If [$?-eq 0]; then

Echo "192.168.4.Secreti is up"

Else

Echo "192.168.4.Secreti is down"

Fi

Let iTunes +

Done

Write a script to test which hosts are powered on and which hosts are powered off in the entire network segment of 192.168.4.0

Status (multi-process version)

#! / bin/bash

# Author: Jacob

# define a function to ping a host and check the survival status of the host

Myping () {

Ping-c2-i0.3-W1 $1 & > / dev/null

If [$?-eq 0]; then

Echo "$1 is up"

Else

Echo "$1 is down"

Fi

}

For i in {1..254}

Do

Myping 192.168.4.

Done

# use the & symbol to put the executed function into the background for execution

# the advantage of this is that you can continue to concurrently ping the second host without waiting for a response from the first host of ping, and so on.

Write a script to display the progress bar

#! / bin/bash

Jindu () {

While:

Do

Echo-n'#'

Sleep 0.2

Done

}

Jindu &

Cp-a $1 $2

Killall $!

Echo "copy complete"

Progress bar, dynamic clockwise version

#! / bin/bash

# define a function that displays progress, which can be quickly displayed on the screen | / -\

Rotate_line () {

INTERVAL=0.1 # set the interval

COUNT= "0" # sets the number of 4 shapes, and the default number is 0 (does not represent any image)

While:

Do

COUNT=expr $COUNT + 1 # executes the loop, with COUNT adding 1 for each loop (representing different shapes in 4, respectively)

Case $COUNT in # judge the value of COUNT. If the value is different, the shape will be different.

"1") # with a value of 1 shows-

Echo-e'-'"\ b\ c"

Sleep $INTERVAL

("2") # the value is shown as 2, and the first\ is escaped

Echo-e'\'"\ b\ c"

Sleep $INTERVAL

("3") # values are displayed as 3 |

Echo-e "|\ b\ c"

Sleep $INTERVAL

"4") # value is 4 display /

Echo-e "/\ b\ c"

Sleep $INTERVAL

*) # reset COUNT to 0 when the value is other

COUNT= "0"

Esac

Done

}

Rotate_line

99 multiplication table (write shell script, print 99 multiplication table)

#! / bin/bash

For i in seq 9

Do

For j in seq $I

Do

Echo-n "$ifuj $[ij]"

Done

Echo

Done

Real-time display of packet traffic sent by eth0 Nic using an endless loop

#! / bin/bash

# Author: Jacob

While:

Do

Echo 'local Nic eth0 traffic information is as follows:'

Ifconfig eth0 | grep "RX pack" | awk'{print $5}'

Ifconfig eth0 | grep "TX pack" | awk'{print $5}'

Sleep 1

Done

Using the personnel list in the user.txt file, automatically create the corresponding account on the computer and configure the initial password

#! / bin/bash

# to execute this script, you need to prepare a user.txt file in advance, which contains several user name information

For i in cat user.txt

Do

Useradd $I

Echo "123456" | passwd-- stdin $I

Done

Write scripts for batch modification of extension, such as batch modification of txt files to doc files

#! / bin/bash

# when executing a script, you need to add location parameters to the script

# script name txt doc (you can change the extension of txt to doc)

# script name doc jpg (you can change the extension of doc to jpg)

For i in "ls. $1"

Do

Mv $I ${I%.}. $2

Done

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