Comments (3)
On Bash, Ksh and Zsh, you can use [[ ]], but you're right in that there's no POSIX sh way of doing that. Shellcheck should probably not suggest this if you're using : and have specified #!/bin/sh
As for floats, POSIX specifically states that string comparison should be used when the arguments are not integers, unlike $(( .. )) where support for floats is allowed. Which shell/environment are you running this on?
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I try to write POSIX /bin/sh scripts, for which some of the messages given by shellcheck are very helpful. You are correct that I could use string comparisons. And anyway there are lots of version numbers for which float (and string) comparison fails. I should probably use dpkg --compare-versions, but that's only available on Debian-derived systems ;)
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From 8d265aa, Shellcheck doesn't warn about expr when using :
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Related Issues (20)
- commit 2024-04-04 14 da8854c: suggest to avoid trailing spaces in output
- aa HOT 1
- Bugs
- Recommend to unset associative array variable before declaration to avoid conversion
- SC2034 doesn't consider local function definitions to define new scopes
- Please separate the issue of unused functions from SC2317 (Command appears to be unreachable) HOT 11
- `require-double-brackets` doesn't work in BusyBox `sh` even though `[[` is supported HOT 2
- SC2115 fires when it is statically verifyable that the variable cannot be empty HOT 2
- SC2221/SC2222 fires for non-exhaustive wildcard patterns HOT 1
- SC2154 var is referenced but not assigned not triggered if used within an array HOT 1
- Feature Request: Provide an option to specify the fallback shell type HOT 9
- SC2251 - add ${PIPESTATUS[0]} check to exceptions HOT 1
- [Bug / regression?] In file ignore directives (# shellcheck disable=<check_id>) are not specific & disable all checks instead (not just check_id) HOT 1
- SC2015 inconsistent behavior HOT 2
- Skip SC2015 when it end with: || true
- Please support all alias for busybox shell equally
- SC2154 from strict bash mode example using trap
- SC2086 false positive on readonly integer variable
- SC2004 false positive on assignment to array position HOT 1
- Missing SC2166 URL in summary section HOT 1
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