SC3043 – ShellCheck Wiki

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In POSIX sh, local is undefined.

Problematic code:

myfunc() {
  local i=0

Correct code:

In POSIX sh, you can adopt some convention to avoid accidentally overwriting variables names, e.g. prefixing with the function name:

myfunc() {


local is supported in many shells, including bash, ksh, dash, and BusyBox ash. However, strictly speaking, it's not POSIX.


Since quite a lot of real world shells support this feature, you may decide to ignore the warning.

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