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Repeat-only for loop without SC2034 #1134

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szepeviktor opened this issue Mar 3, 2018 · 4 comments
Closed

Repeat-only for loop without SC2034 #1134

szepeviktor opened this issue Mar 3, 2018 · 4 comments

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@szepeviktor
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I'd like to repeat something N times:
for UNUSED in {1..16}; do echo 1; done

but shellcheck tells me ^-- SC2034: UNUSED appears unused. Verify it or export it.

What could I do?
@szepeviktor
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I know-I know: # shellcheck disable=SC2034

@koalaman
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koalaman commented Mar 3, 2018

You can also use the name _. This is a feature in JS Python, Haskell and others, and semi-commonly used in sh in e.g. read foo _ bar

@koalaman koalaman closed this as completed Mar 3, 2018
@szepeviktor
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szepeviktor commented Mar 3, 2018 •
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Thank you for your continued support.

@davisRoman
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This was useful. Thank you!

@xinredhat xinredhat mentioned this issue Aug 18, 2022
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fishilico added a commit to fishilico/home-files that referenced this issue Apr 14, 2024
@fishilico
bin/systemd-analyze-plot: do not use read without a variable
14d616e 
shellcheck 0.10.0 reports:

    In bin/systemd-analyze-plot line 32:
        read -r 2> /dev/null
        ^--^ SC3061 (warning): In POSIX sh, read without a variable is undefined.

Silence this by using an unused variable.
koalaman/shellcheck#1134 suggests using `$_`
for such a use-case.
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3 participants
@szepeviktor @davisRoman @koalaman