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9ced683c99
* readonly, {un,}compress, zbarcam: use proper syntax for IO streams
* style-guide: add guidelines for standard streams
* duckdb, perl: add backticks around stdin and stdout
20 lines
701 B
Markdown
20 lines
701 B
Markdown
# perl
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> The Perl 5 language interpreter.
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> More information: <https://www.perl.org>.
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- Print lines from `stdin` [m/] matching regex1 and case insensitive [/i] regex2:
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`perl -n -e 'print if m/{{regex1}}/ and m/{{regex2}}/i'`
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- Say [-E] first match group, using a regexp, ignoring space in regex [/x] :
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`perl -n -E 'say $1 if m/{{before}} ( {{group_regex}} ) {{after}}/x'`
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- [-i]n-place, with backup, [s/] substitute all occurrence [/g] of regex with replacement:
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`perl -i'.bak' -p -e 's/{{regex}}/{{replacement}}/g' {{path/to/files}}`
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- Use perl's inline documentation, some pages also available via man on linux:
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`perldoc perlrun ; perldoc module ; perldoc -f splice; perldoc -q perlfaq1`
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