Shell (i)

File header

#!/bin/sh

Basic syntax:

Define variables:

Your_name= "Aivy"

In addition to explicitly assigning values directly, you can also assign a value to a variable using a statement:

 for file in ' ls/etc ' or  for file in $ (LS/ETC)

The above statement loops out the file name of the directory under/etc.

Pass Parameters && echo Print:

#!/bin/bashyour_name= "Aivy"' Your name: ' $your _name

Print results----> Your name: Aivy

Process Control Statements:

If Else

Note the point:

• else if there is no content, there is no need to write
• The final end needs to be added fi

#!/bin/Basha=10b=20if [$a = = $b   ]then"a equals B"else    "a Not equal to B "fi

For Loop

#!/bin/bash for loop in 1 2 3    4 5 Does "The value is: $loop" Done

Execution Result:

The value is:12345

While statement

#!/bin/shint=1while (($Int.<=5 ))do    echo $  int"    int++" Done

Execution Result:

12345

Until cycle

#!/bin/sha=0! $a-lt ]do   echo $a   "a++"
Done

Execution Result:

0123456789

Case

#!/bin/shanum=1 case    $aNumin 1)  echo ' You selected 1 '    ;;     2)  echo ' You have chosen 2 '    ;;     3)  echo ' You have chosen 3 '    ;;     4)  echo ' You have chosen 4 '    ;;     *)  echo ' You did not enter a number between 1 and 4 '    ;; Esac

Execution Result:

You chose 1.

Shell (i)