SC3029 – ShellCheck Wiki

In POSIX sh, `|&` in place of `2>&1 |` is undefined.

Problematic code:

#!/bin/sh
make |& tee ~/log

Correct code:

Either switch to bash:

#!/bin/sh
make 2>&1 | tee ~/log

Rationale:

Your script uses a shell feature not supported by the shebang. Either rewrite the script to be portable, or change the shebang to explicitly require a shell like Bash.

In this case, the non-portable shorthand |& to pipe both stdout and stderr can be easily replaced with its written out form 2>&1 | as shown.

Exceptions:

None

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