Question

12

rated 0 times [ 12] [ 0] / answers: 1 / hits: 46783 / 2 Years ago, fri, october 21, 2022, 12:59:35

When I’m using for like

 for i in 1 2 3 4 5

then my file contains #!/bin/sh at the top.

But when I’m using

for(( i = 0; i<=5; i++))

then it is showing error

Syntax error: Bad for loop variable

and running properly when I remove shebang. Please tell me the reason behind this.

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2 Years ago

answered 2 Years ago rieency · Accepted Answer

for(( i = 0; i<=5; i++)) is Bash specific and doesn't work with plain Bourne shell (/bin/sh).

If you remove the shebang the script is run by your current shell (which likely is Bash) so it works.

Replace #!/bin/sh with #!/bin/bash to make the shebang work.