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