CODEWITHSUNDEEP
bash
Topas
Topas

Reputation: 31

using ksh shebang in a bash script

We will perform a migration from unix to Linux. the typeset -L only works with ksh

I created the following file:

#!/bin/ksh -u

echo $SHELL
typeset -L21 RUN_LOGL="LOG_FILE    "

Normally the shebang should indicate the correct interpreter (ksh). But when I call the script in a bash way:

$ . test.ksh

The output is:

/bin/bash

-bash: typeset: -L: invalid option

typeset: usage: typeset [-aAfFilrtux] [-p] name[=value] ...

the script is interpreter in bash way , and typeset -L is not accepted. whereas if I simply call

$test.ksh

it runs fine.

Is the way we call the script (bash way or ksh way) important enough to ignore the shebang ?

Thank you in advance.

Upvotes: 2

Views: 3007

Answers (2)

Ignacio Vazquez-Abrams
Ignacio Vazquez-Abrams

Reputation: 798744

. test.ksh

Does not execute the script. It is sourcing the script.

Sourcing a script always ignores the shebang. The shebang is only used when the script is executed like:

chmod +x test.ksh
./test.ksh

Upvotes: 9

meskobalazs
meskobalazs

Reputation: 16041

The shebang is only used if the interpreter was not defined previously, e.g.:

sh myScript.sh

will always invoke your sh, and ignores the shebang.

Upvotes: 0

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