An array of Bash programming series

Array Arrays:

How to declare an array

Declare-a AA

Assignment Method 1:

Aa[0]=jerry

Aa[1]=tom

Aa[2]=wendy

Aa[6]natasha

Default is null between

Assignment Method 2:

Aa= (Jerry Tom Wendy)

Aa= ([0=]jerry [1]=tom] [2]=wendy [6]=natasha]

Aa[3]=selina

Aa[4]=nikita

Experiment:

[Email protected] scripts]# vim testarray.sh

#!/bin/bash

#

Aa= ([0]=jerry [1]=tom [6]=nikita]

Echo ${aa[1]}

Echo ${aa[2]}

Echo ${aa[6]}

[Email protected] scripts]# bash testarray.sh

Tom

Nikita

[Email protected] scripts]#

Randomly select a value between 0-6

[Email protected] scripts]# vim testarray.sh

#!/bin/bash

#

Aa= ([0]=jerry [1]=tom [6]=nikita]

index=$[$RANDOM%7] randomly select a

echo ${aa[$INDEX]}

----------------------------------

Randomly 20 times:

#!/bin/bash

#

Aa= ([0]=jerry [1]=tom [6]=nikita]

For I in {1..20};d o

index=$[$RANDOM%7]

echo ${aa[$INDEX]}

I+=1

Done

-----------------------------------

#!/bin/bash

#

Aa= ([0]=jerry [1]=tom [6]=nikita]

echo ${#AA [0]} indicates the front element length is displayed

[Email protected] scripts]# bash testarray.sh

5

------------------------------------------

#!/bin/bash

#

Aa= ([0]=jerry [1]=tom [6]=nikita]

echo ${#AA [@]} @ or * indicates the number of reference elements (number is not empty)

[Email protected] scripts]# bash testarray.sh

3

----------------------------------

1. Write a script to find the maximum number in the data. This set of data is saved with data

#!/bin/bash

#

Aa= (1 2 3 4 5 6 7111 8 9 101)

Declare-i Max=${aa[0]}

ss=$[${#AA [@]}-1]

For I in ' seq 1 $SS ';d o

If [$MAX-lt ${aa[$I]}];then

max=${aa[$I]}

Fi

Done

Echo $MAX

---------------------------------------

Randomly generate a group of 10 elements, and then find the maximum number

#!/bin/bash

#

For I in {0..9};d o

aa[$I]= $RANDOM

Echo-n "${aa[$I]}"

Done

Echo

Declare-i Max=${aa[0]}

ss=$[${#AA [@]}-1]

For I in ' seq 1 $SS ';d o

If [$MAX-lt ${aa[$I]}];then

max=${aa[$I]}

Fi

Done

Echo $MAX

--------------------------------------

To generate an array:

1. The number of elements in an array is 1-39

2. The elements of an array cannot be the same

3. Display values for each element of this array

#!/bin/bash

Read-p "The element numbers[1-39]:" Elenum

Declare-a ARRAY #将ARRAY定义为数组

function Comele {

For J in ' seq 0 $[${#ARRAY [@]}-1] ';d o

If [$1-eq ${array[$J]}];then

Return 1

Fi

Done

return 0

}

For I in ' seq 0 $[$ELENUM-1] '; Do

While True;d o #while true dead loop

Element= $RANDOM

Comele $RANDOM

If [$?-eq 0];then

Break

Fi

Done

array[$I]= $ELEMENT

echo "${array[$I]}"

Done

---------------------------------------------

Trap: captures a specific signal in a script and can be processed specifically

1:sighup

2:sigint

9:sigkill

15:sigterm

18:sigcont

19:sigstop

Trap ' echo ' NO quit ... ' Int

Functions can be defined to implement. When the utility executes CTRL + C revocation. Delete the previously created file.

#!/bin/bash

#

function DEL {

Rm-rf/var/tmp/test

Exit

}

Trap ' DEL ' INT

Mkdir-p/var/tmp/test

While True;d o

touch/var/tmp/test/file-' Date +%f-%h-%m-%s '

Sleep 2

Done

-------------------------------

This article from "Operation and maintenance Growth Road" blog, declined reprint!

An array of Bash programming series