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1 SC2075
Vidar Holen edited this page 2022-10-19 21:36:39 -07:00
Table of Contents

Escaping \< is required in [..], but invalid in [[..]]

Problematic code:

[[ aardvark \< zebra ]]

Correct code:

[[ aardvark < zebra ]]

Rationale:

Grammatically speaking, [ is considered a normal command name, so < and > are interpreted as redirections. When using the lexicographical string operators < and > in [ .. ], they must be escaped (e.g. \< or "<").

[[ is considered its own grammatical construct, and therefore it does not require (nor does it allow) escaping < or >.

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 above to find a specific one, or see Checks.