SC3009 – ShellCheck Wiki

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In POSIX sh, brace expansion is undefined.

Problematic code:

#!/bin/sh

for i in {1..5}; do ...

Here, $i expands to {1..5}. It does not expand to the sequence 1 2 3 4 5

Correct code:

For simple sequences of numbers, you may use the seq command, e.g. seq 1 5.

Rationale:

Exceptions:

None

ShellCheck is a static analysis tool for shell scripts. This page is part of its documentation.