Shell Programming advanced 2.2 Shell Array

Specify an array for a character

How to display an array

A=1echo $a1

A= (1234) echo $a1

echo ${a[@]} 1 2 3 4

echo ${a[*]}1234

Specifies the number of digits in the display array

echo ${a[0]}1

echo ${a[2]}3

echo ${a[3]}4

Echo ${a[4]} spaces

Add array

a[4]=9echo ${a[4]}9
Echo ${a[*]}
1 2 3) 4 9

To change an element in an array

a[2]=7echo ${a[*]}12749

Get the number of elements in an array

echo ${#a [@]} 5

Sort the 10 arrays to a random 0-9 composition

 for inch 0 9  Do ' s//\n/g ' |sort-n

1759
4489
6142
9428
11344
15643
21679
25832
28684
30867

Remove one of the random 10 numbers

 for inch 0 9  do a[$i]= $RANDOM; Done; Echo ${a[@]}

21159 31025 9479 4700 29562 30523 31666 2424 15437 7014

unset a[4]

Echo ${a[@]}

21159 31025 9479 4700 30523 31666 2424 15437 7014

Select a few values by selecting the specified elements in order

 for inch 0 9  do a[$i]= $RANDOM; Done; Echo ${a[@]}

22278 2889 9019 10031 9383 31004 21595 20556 13672 26323

Echo ${a[@]:0:4}

22278 2889 9019 10031

Echo ${a[@]:1:3}

2889 9019 10031

Echo ${a[@]:4:4}

9383 31004 21595 20556

Shell Programming advanced 2.2 Shell Array