<pre class="prettyprint"><code>perl -p -i.bak -e 's/search_str/replace_str/g' filename </code></pre> <p>What do <code>-p</code>, <code>-i.bak</code> <code>s/</code> and <code>/g</code> mean?</p>

<ul> <li> <code>-p</code>: assume '<code>while (<>) { ... }</code>' loop around program and print each processed line too.</li> <li> <code>-i.bak</code>: change the input file (<code>filename</code>) inplace and create the file <code>filename.bak</code> as backup.</li> <li> <code>s in s/</code>: to mark substitution</li> <li> <code>g</code> - make the substitution globally..that is don't stop after first replacement.</li> </ul>

What does Perl's -p command-line switch do?

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perl

perl -p -i.bak -e 's/search_str/replace_str/g' filename

What do -p, -i.bak s/ and /g mean?

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asked Nov 27 '22 12:11

Bharath

1 Answers

-p: assume 'while (<>) { ... }' loop around program and print each processed line too.
-i.bak: change the input file (filename) inplace and create the file filename.bak as backup.
s in s/: to mark substitution
g - make the substitution globally..that is don't stop after first replacement.