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Joachim Ansorg edited this page Nov 12, 2021 · 2 revisions

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$0 can't be assigned in Dash. This becomes a command name.

Problematic code:

#!/bin/dash
$0=myname

Correct code:

$0 can not be changed in Dash.

Rationale:

You appear to be trying to assign a new value to $0 in Dash.

Dash does not support this. Write around it, or switch to Bash.

Exceptions:

If you instead wanted to compare the value of $0, use a comparison like [ "$0" = "myname" ].

Related resources:

  • Help by adding links to BashFAQ, StackOverflow, man pages, POSIX, etc!