Linux Seventh Week Micro jobs

1. Write a script to determine whether the shell of all users on the current system is a login shell (that is, the user's shell is not/sbin/nologin), the number of these two types of users, and the string comparison;

1) Create file]# vim usershells.sh

#!/bin/bash

# Check current system All users are its login shells

#

Declare-i nologin_num=0

Declare-i login_num=0

For I in $ (cut-d:-F7/ETC/PASSWD); Do

If ["$i" = = "/sbin/nologin"]; Then

Let nologin_num++;

Else

Let login_num++;

Fi

Done

echo "The total number of the user shell, can ' t login is: $nologin _num"

echo "The total number of the user shell This can login is: $login _num"

2) Grant user execute permissions #] chmod u+x usershells.sh

3) Execute the file]#./usershells.sh The following tips: Of course, everyone is the system user number is not the same

The total number of user shells that can ' t login is:23

The total number of user shells that can login Is:5

4) Perform]# grep-o/sbin/nologin/etc/passwd | Wc-l to verify that the user cannot log on to the shell

5) Perform]# grep-v/sbin/nologin/etc/passwd | Wc-l to verify that the user can log in to the shell

2. Write a script

(1) Obtain the host name of the current host and save it in the hostname variable;

(2) Determine if the value of this variable is localhost, and if so, modify the current hostname to www.magedu.com;

(3) Otherwise, the current host name is displayed;

1) Edit File]# vim hostname.sh

#!/bin/bash

# Get current system hostname

Hostname= ' hostname ' #使用反引号获取

If ["$hostname" = = "localhost"]; Then

Hostname www.magedu.com

echo "Hostname have changed to Www.magedu.com"

Else

echo "Current hostname is $hostname"

Fi

2) Grant hostname.sh File execution rights]# chmod u+x hostname.sh

3) Execute file]#./hostname.sh

Hostname have changed to www.magedu.com

3, write a script to complete the following functions

(1) Pass a disk device file path to the script to determine whether the device exists;

(2) If present, displays all the partition information on this device;

1) Edit File #] Vim deviceinfo.sh

#!/bin/bash

# Check device is it isn't exists, it's exist that list deviceinfo

Read-p "Please input a device path:" DevicePath

If [-Z $devicepath];then

echo "Usage:please input a device path"

Exit 1

Fi

If [-B $devicepath];then

Fdisk-l $devicepath

Else

echo "No such device"

Fi

2) Grant user execute permission]# chmod u+x deviceinfo.sh

3) Execute file]#./deviceinfo.sh as follows:

Please input a device PATH:/DEV/SDA #在提示下输入/DEV/SDA equipment Path

Disk/dev/sda:21.5 GB, 21474836480 bytes, 41,943,040 sectors

Units = Sector of 1 * bytes

Sector size (logical/Physical): 512 Bytes/512 bytes

I/o size (min/best): 512 Bytes/512 bytes

Disk label Type: dos

Disk identifier: 0x00049c92

Device Boot Start End Blocks Id System

/DEV/SDA1 * 2048 1026047 512000 Linux

/dev/sda2 1026048 41943039 20458496 8e Linux LVM

[Email protected] tmp]#./deviceinfo.sh

Please input a device path:/dev/sdb

Disk/dev/sdb:85.9 GB, 85899345920 bytes, 167,772,160 sectors

Units = Sector of 1 * bytes

Sector size (logical/Physical): 512 Bytes/512 bytes

I/o size (min/best): 512 Bytes/512 bytes

Do not enter anything and then directly enter

[Email protected] tmp]#./deviceinfo.sh

Please input a device path:

Usage:please Input a device path

Enter a device path that does not exist

[Email protected] tmp]#./deviceinfo.sh

Please input a device Path:/dev

No such device

4, write a script to complete the following functions

The script can accept a parameter;

(1) If the parameter 1 is quit, the exit script is displayed, and the normal exit is performed;

(2) If the parameter 1 is yes, the execution script is displayed;

(3) Otherwise, the parameter 1 is any other value, performs an abnormal exit;

1) Edit the file

[email protected] tmp]# cat parametertest.sh

#!/bin/bash

#

Read-p "Please input a word (Quit|yes):" Parameter

While True;do

Case $parameter in

Quit

echo "Exit the script"

Exit 0;;

Yes

echo "continue to excute the script"

Read-p "Please input a word (Quit|yes):" parameter;;

*)

echo "Error Exit"

Exit 1;;

Esac

Done

2) Grant user execute file]# chmod u+x parametertest.sh

3) test script file

[Email protected] tmp]#./parametertest.sh

Please input a word (Quit|yes): Yes

Continue to excute the script

Please input a word (Quit|yes): Quit

Exit the script

[Email protected] tmp]#./parametertest.sh

Please input a word (Quit|yes): bye

Error exit

5, write a script to complete the following functions

Pass a parameter to the script, this parameter is one of gzip, bzip2 or XZ;

(1) If the value of parameter 1 is gzip, use the TAR and gzip archive to compress/etc directories into the/backups directory and name/backups/etc-20160613.tar.gz;

(2) If the value of parameter 1 is bzip2, use tar and bzip2 archive to compress/etc directory to/backups directory, and named/backups/etc-20160613.tar.bz2;

(3) If the value of parameter 1 is XZ, then the tar and XZ archives are used to compress/etc directories into the/backups directory and named/backups/etc-20160613.tar.xz;

(4) Any other value, the error compression tool is displayed, and an abnormal exit is performed;

1) Create a script file Vim compress.sh

[email protected] tmp]# cat compress.sh

#!/bin/bash

# Check input parameter is it gzip or bzip2 or XZ

#

if [!-e/backups]; Then

Mkdir/backups

Fi

Read-p "Please choose a format of compression (GZIP|BZIP2|XZ):" Zip

Case $zip in

Gzip

tar-zcf/backups/etc-$ (date +%y%m%d). tar.gz/etc;

BZIP2)

tar-jcf/backups/etc-$ (date +%y%m%d). tar.bz2/etc;

Xz

tar-jcf/backups/etc-$ (date +%y%m%d). tar.xz/etc;

*)

echo "error compression format"

Exit 1;;

Esac

2) Grant user execute permission]# chmod u+x compress.sh

3) Execute script

[Email protected] tmp]#./compress.sh

Please choose a format of compression (GZIP|BZIP2|XZ): gzip

Tar: Remove the Beginning "/" from the member name

[Email protected] tmp]#./compress.sh

Please choose a format of compression (GZIP|BZIP2|XZ): bzip2

Tar: Remove the Beginning "/" from the member name

[Email protected] tmp]#./compress.sh

Please choose a format of compression (GZIP|BZIP2|XZ): XZ

Tar: Remove the Beginning "/" from the member name

[Email protected] tmp]#./compress.sh

Please choose a format of compression (GZIP|BZIP2|XZ): Tar

Error compression format

[Email protected] tmp]# ls-l/backups/

Total dosage 26328

-rw-r--r--1 root root 8577760 August 16:38 etc-20170826.tar.bz2

-rw-r--r--1 root root 9794015 August 16:35 etc-20170826.tar.gz

-rw-r--r--1 root root 8577760 August 16:38 etc-20170826.tar.xz

6. Write a script that accepts a path parameter:

(1) If it is an ordinary document, it can be accessed normally;

(2) If it is a catalog file, then the CD command is available for it;

(3) If the file is a symbolic link, the description is a access path;

(4) Other is impossible to judge;

1) Create a script file Vim pathtest.sh

[email protected] tmp]# cat pathtest.sh

#!/bin/bash

#

Read-p "Please input a path:" Path

If [-f $path]; Then

echo "${path} can be visited"

Cat $path

elif [-D $path]; Then

echo "${path} can use ' CD ' command"

elif [-H $path]; Then

echo "${path} is a access path"

Ls-l $path

Else

echo "Unknown file"

Exit 1

Fi

2) Grant user execute permission chmod u+x pathtest.sh

3) test File

[Email protected] tmp]#./pathtest.sh

Please input a path:/etc

/etc can use ' CD ' command

[Email protected] tmp]#./pathtest.sh

Please input a path:/ETC/FA

Unknown file

[Email protected] tmp]#./pathtest.sh

Please input a path:/etc/fstab

/etc/fstab can visited

#

#/etc/fstab

# Created by Anaconda on Mon Jul 3 01:42:15 2017

#

# Accessible filesystems, by reference, is maintained under '/dev/disk '

# See mans Pages Fstab (5), Findfs (8), mount (8) and/or Blkid (8) for more info

#

/DEV/MAPPER/CENTOS-ROOT/XFS Defaults 0 0

Uuid=ddb0b178-1278-498e-acee-c1436685cfbc/boot XFS Defaults 0 0

/dev/mapper/centos-swap swap swap defaults 0 0

[Email protected] tmp]#./pathtest.sh

Please input a path:/dev/cdrom

/dev/cdrom is a access path

lrwxrwxrwx 1 root root 3 August 15:20/dev/cdrom-sr0

7, write a script, get the host name of the current host, judge

(1) If the host name is empty or localhost, or "(none)", it is named mail.magedu.com;

(2) Otherwise, display the existing host name can be;

1) Edit the script file vim hostnametest.sh

[email protected] tmp]# cat hostnametest.sh

#!/bin/bash

# Get current hostname

Hostname= ' hostname '

If [-Z $hostname-o $hostname = = "localhost"-o $hostname = = "None"]; Then

Hostname mail.magedu.com

Else

echo "Current hostname is $hostname"

Fi

2) Grant user execute permission]# chmod u+x hostnametest.sh

3) test script file

[Email protected] tmp]# hostname

Www.magedu.com

[Email protected] tmp]#./hostnametest.sh

Current hostname is www.magedu.com

8, write a script, accept a user name as a parameter;

(1) If the user's ID number is 0, it is displayed as an administrator;

(2) If the user's ID number is greater than 0 and less than 500, it is displayed as a system user;

(3) Otherwise, it is displayed as a normal user;

1) Create a script file Vim userstest.sh

[email protected] tmp]# cat userstest.sh

#!/bin/bash

# check UserID

Read-p "Please input a username:" username

If [-Z $username];then

echo "Usage:please input a username"

Exit 1

Fi

If!id $username &>/dev/null; Then

echo "User doesn ' t exist"

Else

userid=$ (id-u $username)

If [$userid-eq 0]; Then

echo "$username is a administrator"

elif [$userid-gt 0-a $userid-lt 500]; Then

echo "$username is a system user"

Else

echo "$username is a normal user"

Fi

Fi

2) Grant user execute permission chmod u+x userstest.sh

3) Testing

[Roo[email protected] tmp]#./userstest.sh

Please input a Username:centos

CentOS is a normal user

[Email protected] tmp]#./userstest.sh

Please input a username:root

Root is a administrator

[Email protected] tmp]#./userstest.sh

Please input a username:sshd

SSHD is a system user

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Linux Seventh Week Micro jobs