Shell script Common script: For loop

 Shellscript Common script:ForLoops

Wheil Many loops can be replaced with a for loop

For loop syntax structure

For variable name in variable Value list

Do

instruction

Done

For ((EXP1;EXP2;EXP3))

Do

instruction

Done

Script instance:For 99multiplication Table

#!/bin/bash

#Date: 2016-11-22 15:04:12 # #date "+%y-%m-%d%h:%m:%s"

#Author: Jorbabe

#Mail: [Email protected]

#Function: The multiplication table

#Version: version V1.1

#Update: 2016-11-22 15:04:12

For a in ' SEQ 1 9 '

Do

For b in ' SEQ 1 9 '

Do

If [$a-ge $b];then

Echo-en "\t$a x $b" = $ (expr $a \* $b)

Fi

Done

echo ""

Done

[Email protected] for]#./for02.sh

1 x 1 = 1

2 x 1 = 2 2 x 2 = 4

3 x 1 = 3 3 x 2 = 6 3 x 3 = 9

4 x 1 = 4 4 x 2 = 8 4 x 3 = 4 x 4 = 16

5 x 1 = 5 5 x 2 = 5 x 3 = 5 x 4 = 5 x 5 = 25

6 x 1 = 6 6 x 2 = 6 x 3 = 6 x 4 = 6 x 5 = 6 x 6 = 36

7 x 1 = 7 7 x 2 = 7 x 3 = 7 x 4 = 7 x 5 = 7 x 6 = 7 x 7 = 49

8 x 1 = 8 8 x 2 = 8 x 3 = 8 x 4 = 8 x 5 = 8 x 6 = 8 x 7 = 8 x 8 =

9 x 1 = 9 9 x 2 = 9 x 3 = 9 x 4 = 9 x 5 = 9 x 6 = 9 x 7 = 9 x 8 = 72 9 x 9 = 81

  Script instance:For 1-100sum

#!/bin/bash

#Date: 2016-11-22 15:04:12 # #date "+%y-%m-%d%h:%m:%s"

#Author: Jorbabe

#Mail: [Email protected]

#Function: 1-100 sum

#Version: version V1.1

#Update: 2016-11-22 15:04:12

for ((i=0; i<=100; i++)

Do

((J=j+i))

Done

#echo $j

[-N "$j"] && printf "totalsum is: $j \ n"

[Email protected] for]#./for03.sh

Totalsum is:5050

Script instance: Batch file creation

#!/bin/bash

#Date: 2016-11-22 15:04:12 # #date "+%y-%m-%d%h:%m:%s"

#Author: Jorbabe

#Mail: [Email protected]

#Function: Batch file Creation

#Version: version V1.1

#Update: 2016-11-22 15:04:12

# recursively create files and go to directory

Mkdir-p/tmp/shell/for/test/&& Cd/tmp/shell/for/test

For FileNum in ' seq 10 '

Do

Touch jorbabe-$filenum

Done

[email protected] for]# ll test/

Total 0

-rw-r--r--. 1 root root 0 Nov 10:36 jorbabe-1

-rw-r--r--. 1 root root 0 Nov 10:36 jorbabe-10

-rw-r--r--. 1 root root 0 Nov 10:36 jorbabe-2

.............

 Script instance: Bulk create user settings password

#!/bin/bash

#Date: 2016-11-22 15:04:12 # #date "+%y-%m-%d%h:%m:%s"

#Author: Jorbabe

#Mail: [Email protected]

#Function: Batch Create user and set random password

#Version: version V1.1

#Update: 2016-11-22 15:04:12

# Call System library

. /etc/init.d/functions

#>/tmp/shell/for/test/user.log

#>/tmp/shell/for/test/fail_user.log

# Value 01-10

For N in $ (seq-w 10)

Do

# Time Format

tim= ' Date ' +%y_%m_%d%h:%m:%s "'

# Random Password

Passwd= ' echo $ (date +%t%n) $RANDOM |md5sum|cut-c 2-9 '

# Create user account

Useradd jorbabe-$n >&/dev/null && user_status=$?

# Set User password

echo "$passwd" |passwd--stdin jorbabe-$n >&/dev/null && pass_status=$?

# Check user created in Settings

If [$user _status-eq 0-a $pass _status-eq 0]; Then

Action "AddUser jorbabe-$n"/bin/true

# Create success, generate account information write to log

Echo-e "$tim \tuser:jorbabe-$n \tpass: $passwd" >>/tmp/shell/for/test/user.log

Else

Action "AddUser jorbabe-$n"/bin/false

# Create failed, generate account information write to log

Echo-e "$tim \tuser:\tjorbabe-$n pass:\t$passwd" >>/tmp/shell/for/test/fail_user.log

Fi

Done

[Email protected] for]#./for05.sh

AddUser jorbabe-01 [OK]

AddUser jorbabe-02 [OK]

AddUser jorbabe-03 [OK]

AddUser jorbabe-04 [OK]

AddUser jorbabe-05 [OK]

AddUser jorbabe-06 [OK]

AddUser jorbabe-07 [OK]

AddUser jorbabe-08 [OK]

AddUser jorbabe-09 [OK]

AddUser jorbabe-10 [OK]

[email protected] for]# cat Test/user.log

2016_11_22 12:08:43 user:jorbabe-01 pass:84327849

2016_11_22 12:08:43 user:jorbabe-02 Pass:cf11a1ee

2016_11_22 12:08:43 user:jorbabe-03 pass:2a60233d

2016_11_22 12:08:43 user:jorbabe-04 pass:2d181418

2016_11_22 12:08:43 user:jorbabe-05 Pass:641f69d6

2016_11_22 12:08:43 user:jorbabe-06 pass:b8d57d2a

2016_11_22 12:08:43 user:jorbabe-07 PASS:AE123CB3

2016_11_22 12:08:44 user:jorbabe-08 pass:db1f73c1

2016_11_22 12:08:44 user:jorbabe-09 pass:a6bc81e1

2016_11_22 12:08:44 user:jorbabe-10 Pass:22aac1f2

[Email protected] for]#

Delete the user account created by the script

[[email protected] for]# for N in $ (seq-w);d o userdel-r jorbabe-$n;d One

Shell script Common script: For loop