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== sed == |
== sed == |
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+ | {|width="100%" style="border:1px solid black; margin-left: .5em;" |
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+ | |-style="background-color:#C8FCFF;" |
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+ | |width="25%"|task |
| + | |width="40%"|sed |
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| − | |- |
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| + | |perl |
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| − | | Replace ''12'' with ''twelve'' || <code>sed 's/12/twelve/g'</code> || <code>perl -pe 's/12/twelve/g'</code> |
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| + | |Replace ''12'' with ''twelve'' |
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| ⚫ | |||
| + | |<code>sed 's/12/twelve/g'</code> |
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| + | |<code>perl -pe 's/12/twelve/g'</code> |
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| + | |Replace the word ''sh'' with ''Bourne Shell'' |
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| + | |<code>perl -pe 's/\bsh\b/Bourne Shell/g'</code><ref>Will match any perl ''word-boundary'' which consists of A-Za-z_ followed by a non A-Za-z_</ref> |
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| + | |Remove lines 2 to 4 from stream |
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| + | |<code>sed '2,4d'</code> |
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| width="25%" | task || width="40%" | grep || perl |
| width="25%" | task || width="40%" | grep || perl |
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|- |
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| − | | Print only lines containing ''12'' || <code>grep '12'</code> || <code>perl -nle 'print if /12/'</code> |
+ | | Print only lines containing ''12'' || <code>[http://programmingbulls.com/perl-grep grep ]'12'</code> || <code>perl -nle 'print if /12/'</code> |
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| Print only lines not containing ''12'' || <code>grep -v '12'</code> || <code>perl -nle 'print if !/12/'</code> |
| Print only lines not containing ''12'' || <code>grep -v '12'</code> || <code>perl -nle 'print if !/12/'</code> |
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| − | |- |
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| width="25%" | task || width="40%" | nl || perl |
| width="25%" | task || width="40%" | nl || perl |
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| − | | Insert line numbers (lined up)|| nl -ba || perl -nle 'printf "%6s |
+ | | Insert line numbers (lined up)|| <code>nl -ba</code> || <code>perl -nle 'printf "%6s %s\n", $., $_'</code> |
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<references/> |
<references/> |
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[[Category:Intro]] |
[[Category:Intro]] |
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Latest revision as of 12:05, 10 August 2011
This article compares how simple tasks are done using UNIX tools and Perl one-liners.
sed[]
| task | sed | perl |
| Replace 12 with twelve | sed 's/12/twelve/g'
|
perl -pe 's/12/twelve/g'
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| Replace the word sh with Bourne Shell | sed -e 's/ sh / Bourne Shell /g'[1]
|
perl -pe 's/\bsh\b/Bourne Shell/g'[2]
|
| Remove lines 2 to 4 from stream | sed '2,4d'
|
perl -nle 'print if $.<2 || $.>4'
|
awk[]
| task | awk | perl |
| Print second field (whitespace-separated) | awk '{print $2}' |
perl -lane 'print $F[1]'
|
| Count lines starting with X | awk '/^X/ {++x} END {print x}' |
perl -nle '++$x if /^X/; print $x if eof'
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| Add numbers in second column and print sum | awk '{sum+=$2} END {print sum}' |
perl -lane '$sum+=$F[1]; print $sum if eof'
|
tr[]
| task | tr | perl |
| ROT13 | tr 'A-Za-z' 'N-ZA-Mn-za-m' |
perl -pe 'y/A-Za-z/N-ZA-Mn-za-m/'
|
| Remove carriage return from DOS files [3] | tr -d '\r' |
perl -pe 'tr/\r//d'
|
grep[]
| task | grep | perl |
| Print only lines containing 12 | grep '12' |
perl -nle 'print if /12/'
|
| Print only lines not containing 12 | grep -v '12' |
perl -nle 'print if !/12/'
|
nl[]
| task | nl | perl |
| Insert line numbers (lined up) | nl -ba |
perl -nle 'printf "%6s %s\n", $., $_'
|