1 SC1076

Vidar Holen edited this page 2022-10-19 20:48:37 -07:00

Table of Contents

• Trying to do math? Use e.g. [ $((i/2+7)) -ge 18 ].
• Problematic code:
• Correct code:
• Rationale:
• Exceptions:
• Related resources:

Trying to do math? Use e.g. [ $((i/2+7)) -ge 18 ].

Problematic code:

[ i / 2 + 7 -ge 18 ]

Correct code:

[ $((i / 2 + 7)) -ge 18 ]

Rationale:

ShellCheck found a loose +*/% in a test statement. This usually happens when trying to do arithmetic in a condition, but without using the arithmetic expansion construct $((expression)).

In C, if (a+b == c) is perfectly fine, but in sh this must be written to first expand the arithmetic operation like if [ $((a+b)) = c ].

Exceptions:

None.

Related resources:

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

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