Linux Learning Basics 7 Script Exercises

Practice:

Pass a user name parameter to the script to determine if the user's user name is consistent with the group name of their base group, and the results are displayed.

Write a script:

#!/bin/bash

User=$1

if [! $#-eq 1];then

echo "Please input only one username"

Exit 2

Fi

if! ID $ &>/dev/null;then

echo "The user is not exist"

Exit 3

Fi

If [' Id-u $ '-eq ' id-g $ '];then

echo "Same"

Else

echo "Different"

Fi

determine the current host's The CPU manufacturer whose information is in the vendor ID row in the /proc/cpuinfo file .

if its manufacturer is AUTHENTICAMD, the company isshown as AMD ;

if its manufacturer is Genuineintel, it is shown as Intel Corporation;

Otherwise, it is said that it is a non-mainstream company;

#!/bin/bash

Cpufac= ' sed-n '/^vendor_id/p '/proc/cpuinfo | Cut-d '-f2 '

if [$CPUFAC = = Authenticamd];then

echo "AMD"

Elif

[$CPUFAC = = Genuineintel];then

echo "Inter"

Else

echo "Other company"

Fi

Write a script:

Pass three integers to the script to determine the maximum and minimum numbers and display them.

#!/bin/bash

DECLARE maxnum

DECLARE minnum

If [$#-ne 3];then

echo "Please input three number"

Exit 2

Fi

If [$1-ge $];then

Maxnum=$1

Minnum=$2

Else

Maxnum=$2

Minnum=$1

Fi

If [$MAXNUM-ge $];then

echo "The Maxnum is $MAXNUM"

[$1-ge] && echo "is first number" | | echo "is second number"

Else

Maxnum=$3

echo "The Maxnum is $MAXNUM is third number"

Fi

If [$MINNUM-le $];then

[$1-le]&& echo "The Minnum is $" | | echo "The Minnum is $"

[$1-le]&& echo "The Minnum is First" | | echo "The Minnum is second"

Else

echo "The Minnum is $ third number"

Fi

Test string

1 [$A = = $B] at this time, = = before and after the white space is to be recognized or the default will be identified as an assignment,

2 [$A! = $B]

3 a single-mesh operator that tests whether a string is empty

-n string null is true, NOT NULL for true NULL when false and test [ space variable space ] such format to test

4 test string is not empty

-S not empty for true, empty for false

4 test string is greater than > < to indicate

Use for Loops

For variable in list;

command line 1;

command line 2;

Done

1.1 Build List

1.1{1..100}

1.2 Seq Start number step end number

Seq number means starting from 1 to number

Seq number1 number2 Indicates a step size of 1 with a number1 ending Count of number2

Seq number1 number2 Number3 1 Indicates the start number 2 indicates the step 3 represents the end number

1.3 ' ls/etc/'

declaration of data type declare

Declare-i sum=0 declaration as an integer!

Declare-x declared as environment variable

Write a script:

1, the value of the set Variable FILE is /etc/passwd

2. say hello to each user in/etc/passwd and show the shellof each other inturn ,such as:

Hello, Root, your shell:/bin/bash

3. count the number of users

4. just ask the default shell for bash users .

# CAT/ETC/PASSWD | Cut-d:-f1,7 | head-1 | Tail-1 | Cut-d:-f2 | Sed ' [Email protected]/.*/@@ '

# CAT/ETC/PASSWD | Cut-d:-f1,7 | head-1 | Tail-1 | Cut-d:-f1

#!/bin/bash

DECLARE I

DECLARE j=0

Num= ' cat/etc/passwd | Wc-l '

For I in ' seq $NUM ';d o

User= ' cat/etc/passwd | Cut-d:-f1,7 | head-$I | Tail-1 | cut-d:-f1 '

Ushell= ' cat/etc/passwd | Cut-d:-f1,7 | head-$I | Tail-1 | Cut-d:-f2 | Sed ' [Email protected]/.*/@@ '

# echo "HI $USER your shell is $USHELL"

if [$USHELL = = Bash];then

echo "Hi $USER your shell is $USHELL"

Let j= $J +1

Fi

Done

echo "The users total was $I the bash is $J"

Exit

Write a script:

1, add ten users user1 to user10, password with the user name, but requires only the user does not exist in the case can be added;

Extended:

Accept a parameter:

Add: Adding user user1. User10

Del: Delete user user1. User10

Other: Exit

Adminusers User1,user2,user3,hello,hi

!/bin/bash

if [= = = "Add"];then

For I in {1..10};d o

If ID user$i &>/dev/null;then

echo "user$i is exist"

Else

Useradd user$i

echo "User$1" | passwd--stdin user$i &>/dev/null

Fi

Done

elif [= = = "Del"];then

For I in {1..10};d o

Userdel-r user$i

Done

Else

echo "Please input Add or del"

Exit 2;

Fi

write a script that shows all default shell- bash users on the current system and the default Shell as /sbin/ Nologin users, and Count The total number of users under each shell. The results appear as follows:

BASH,3users, they are:

Root,redhat,gentoo

Nologin, 2users, they is:

Bin,ftp

#!/bin/bash

#

Numbash= ' grep ' bash$ '/etc/passwd | Wc-l '

bashusers= ' grep ' bash$ '/etc/passwd | cut-d:-f1 '

Bashusers= ' echo $BASHUSERS | Sed ' [Email protected][[:space:]]@,@g '

echo "BASH, $NUMBASH users, they is:"

echo "$BASHUSERS

Combination test conditions

-A: with relation

-O: or relationship

! : Non-relational

If [$#-gt 1-a $#-le 3]

If [$#-gt 1] && [$#-le 3]

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Linux Learning Basics 7 Script Exercises