This article compares how simple tasks are done using UNIX tools and Perl one-liners.

sed Edit

task sed perl
Replace 12 with twelve sed 's/12/twelve/g' perl -pe 's/12/twelve/g'
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 Edit

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'
Add numbers in second column and print sum awk '{sum+=$2} END {print sum}' perl -lane '$sum+=$F[1]; print $sum if eof'

tr Edit

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 Edit

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 Edit

task nl perl
Insert line numbers (lined up) nl -ba perl -nle 'printf "%6s %s\n", $., $_'

Footnotes Edit

  1. Won't match words at start/end of line
  2. Will match any perl word-boundary which consists of A-Za-z_ followed by a non A-Za-z_
  3. This method will remove all carriage return characters, not only those at end of line

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