Gnu sed: Difference between revisions
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Gnu sed performs search/replace within stdin or files.<br> | Gnu sed performs search/replace within stdin or files.<br> | ||
See also [[bsd sed]]. | See also [[bsd sed]]. | ||
= Overview = | |||
<blockquote> | |||
sed lets you manipulate text streams using commands. | |||
* <code>s</code> command search/replaces text (by default on each line)(ex: <code>sed 's/regexp/repl/'</code>) | |||
<syntaxhighlight lang="bash"> | |||
</syntaxhighlight> | |||
</blockquote><!-- Overview --> | |||
= Usage = | = Usage = | ||
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# Replace 'aaa' with 'bbb' | # Replace 'aaa' with 'bbb' | ||
cat echo "aaa_stuff_aaa" \ | cat echo "aaa_stuff_aaa" \ | ||
| sed 's_aaa_bbb_g' | | sed 's_aaa_bbb_g' | ||
# Regex | # Regex | ||
cat echo "aaa_stuff_aaa" \ | cat echo "aaa_stuff_aaa" \ | ||
| sed 's_[a]*_b_g' | | sed -E 's_[a]*_b_g' | ||
# Group matching (\2 is a variable that refers to the | # Group matching (\2 is a variable that refers to the | ||
# second match group. In this case, 'stuff' | # second match group. In this case, 'stuff' | ||
cat echo "aaa_stuff_aaa" \ | cat echo "aaa_stuff_aaa" \ | ||
| sed 's_\([a]*\)\(stuff\)_\2\n' | | sed -E 's_\([a]*\)\(stuff\)_\2\n' | ||
Revision as of 13:38, 16 October 2021
Gnu sed performs search/replace within stdin or files.
See also bsd sed.
Overview
sed lets you manipulate text streams using commands.
scommand search/replaces text (by default on each line)(ex:sed 's/regexp/repl/')
Usage
# Replace 'aaa' with 'bbb' cat echo "aaa_stuff_aaa" \ | sed 's_aaa_bbb_g' # Regex cat echo "aaa_stuff_aaa" \ | sed -E 's_[a]*_b_g' # Group matching (\2 is a variable that refers to the # second match group. In this case, 'stuff' cat echo "aaa_stuff_aaa" \ | sed -E 's_\([a]*\)\(stuff\)_\2\n' # Replace file contents sed -i"bak" "s_aaa_bbb_g" /path/to/file
