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Vidar Holen edited this page Nov 3, 2022 · 1 revision

Use && for logical AND. Single & will background and return true.

Problematic code:

if [ "$1" = "install" ] & [ "$USER" != "root" ]
then
  echo "Must be root to install"
fi

Correct code:

if [ "$1" = "install" ] && [ "$USER" != "root" ]
then
  echo "Must be root to install"
fi

Rationale:

ShellCheck found a test command followed by a &. This runs the test in the background, effectively ignoring it. To specify "logical AND" between two commands, use &&.

Exceptions:

None

Related resources:

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

ShellCheck

Each individual ShellCheck warning has its own wiki page like SC1000. Use GitHub Wiki's "Pages" feature guerraart8 to find a specific , or see Checks.

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