Question

12

Help on if-else in shell

rated 0 times [ 12] [ 0] / answers: 1 / hits: 40959 / 3 Years ago, tue, november 16, 2021, 4:43:08

Please help me writing a shell programming using if else, all possibile code using [[ ]], [ ], (( )).

I tried but it does not work (you can check my previous question Arithmetic binary operators -gt, -lt give error but work in a shell script).

Here is the C version:

int i = 10, n = 20;



if (i < n)

    printf("i smaller");

else if (i > n)

    printf("n smaller");

else

    printf("same");

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wheance

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3 Years ago

answered 3 Years ago njuash · Accepted Answer

What about

#!/bin/sh



i=1

n=2



if [ "$i" -gt "$n" ]; then 

    echo "i is bigger" 

elif [ "$n" -gt "$i" ]; then 

    echo "n is bigger" 

else 

    echo "same" 

fi

second...

#!/bin/bash



i=1

n=2



if ((i > n)) ; then 

    echo "i is bigger" 

elif ((i < n)); then

    echo "n is bigger"

else

    echo "same"

fi

and last one...

#!/bin/bash



i=1

n=2



if [[ $i -gt $n ]]; then 

    echo "i is bigger"

elif [[ $i -lt $n ]];  then

    echo "n is bigger"

else

    echo "same"

fi