If to determine the size of two values -- multi-branch if statement to strictly judge the parameters

If to determine the size of two values -- multi-branch if statement to strictly judge the parameters

#! /Bin/bash

Print_usage (){

Printf "the number of parameters you entered is incorrect or incorrect. Run the following syntax: \ n"

Echo-e "$0 digit 1 digit 2"

Exit1

}

If [$ #-ne 2]

Then

Print_usage

Exit1

Fi

[-N "'echo $1 | SED's/[0-9] // g''"-a-n "'echo $2 | SED's/[0 -9] // g'' "] & Echo" Both parameters must be numbers "& Exit 1

 

[-N "'echo $1 | SED's/[0-9] // g''"] & Echo "the first parameter must be a number" & Exit 1

[-N "'echo $2 | SED's/[0-9] // g''"] & Echo "the second parameter must be a number" & Exit 1

If [$1-GT $2]

Then

Echo "$1> $2"

Elif [$1-lt $2]

Then

Echo "$1 <$2"

Else

Echo "$1 = $2"

Fi

1. Single judgment syntax

[-N "'echo $1 | SED's/[0-9] // g''"] & Echo "the first parameter must be a number" & Exit 1

[-N "'echo $2 | SED's/[0-9] // g''"] & Echo "the second parameter must be a number" & Exit 1

2. Normal variable judgment

[-N "'echo $2 | SED's/[0-9] // g''"] & {

Echo "the second parameter must be a number"

Exit1

}

If to determine the size of two values -- multi-branch if statement to strictly judge the parameters