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<code>sed</code> utility is using for text processing, such as strings replacements.
<code>[[wikipedia:sed]]</code> ([[1974]]) utility is using for text processing, such as strings replacements.
 
* Man: https://manpages.ubuntu.com/manpages/noble/en/man1/sed.1.html
 
* Man: https://man7.org/linux/man-pages/man1/sed.1p.html
 
  
sed /xxx/yyy/g
 
 
  g - global
 
[[sed -i|-i]]  -i[SUFFIX], --in-place[=SUFFIX] edit files in place (makes backup if SUFFIX supplied)
 
[[sed -e|-e]]
 
 
  -E, -r, --regexp-extended use extended regular expressions in the script (for portability use [[POSIX -E]]).
 
 
[[brew install gnu-sed]]
 
  
  
 
== Sed Basic examples ==
 
== Sed Basic examples ==
 
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* Append a text (TEST_TO_APPEND_AT_BEGINNIG) at the beginning of a line: <code>sed -i s/^/TEST_TO_APPEND_AT_BEGINNIG/ file.txt</code>
* [[Replace]] all occurrences of TEXT_STRING (<code>/g</code>)
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* Append a text (TEST_TO_APPEND_AT_END) at the end of a line: <code>sed -i s/$/TEST_TO_APPEND_AT_END/ file.txt</code>
:: <code>[[sed -i]] s/OLD_TEXT_STRING/NEW_TEXT_STRING/g file.txt</code>
 
 
 
* [[Append]] a text (TEST_TO_APPEND_AT_BEGINNIG) at the [[beginning]] of a line:
 
:: <code>sed -i s/^/TEST_TO_APPEND_AT_BEGINNIG/ file.txt</code>
 
 
 
:: [[Append a space]] at the beginning of lines:
 
::: <code>[[sed s/^./" "/]]</code>
 
 
 
* Append a text (TEST_TO_APPEND_AT_END) at the [[end of a line]] (<[[code]]>$</code>):
 
:: <code>sed -i s/$/TEST_TO_APPEND_AT_END/ file.txt</code>
 
 
 
* Move N [[lines]] from text file to new file:
 
:: <code>head -1000 input > output && sed -i '1,+999d' input</code> <ref>https://stackoverflow.com/a/801036</ref>
 
 
 
* Add  at the beginning and end of a sentence: <pre><code> and </code></pre>
 
<pre>sed s/'^'/'\<code\>'/ | sed s/'$'/'\<\/code\>'/</pre>
 
 
 
sed s/^/"[["/ | sed s/$/"]]"/
 
 
 
* Add * at the beginning of the line:
 
::<code>[[sed]] s/^/"*"/ </code>
 
 
 
* Replace [[spaces]]:
 
:<code>[[sed]] s/' '//g</code>
 
 
 
* Delete characters before a pattern
 
[[sed -e]] 's/....yourtext/ yourtext/g' file.txt
 
 
 
* sed -Ei 's/^# deb-src /deb-src /' [[/etc/apt/sources.list]]
 
 
 
== Help ==
 
usage: sed script [-Ealn] [-i extension] [file ...]
 
      sed [-Ealn] [-i extension] [-e script] ... [-f script_file] ... [file ...]
 
 
 
== Related ==
 
* <code>[[awk]]</code>
 
* <code>[[lineinfile (Ansible)]]</code>
 
* Concatenate lines on a file using <code>[[tr]]</code>
 
* <code>cat your_file.txt | [[while read]] i; do echo "YOUR_TEST $i"; done</code>
 
* <code>cat your_file.txt | [[while read]] i; do echo "$(date) $i"; done</code>
 
* <code>[[sed -n]]</code>
 
* [[Chef: Editing a file]]: <code>[[replace_or_add]]</code>
 
* [[Redirection]]: [[double redirection]]
 
* [[file (Puppet)]]
 
* [[prepend]]
 
* [[kubectl patch]]
 
* [[gsub]] [[gwak]]
 
* <code>[[envsubst]]</code>
 
  
 
== See also ==
 
== See also ==
* {{sed}}
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* [[vi (editor)]]
* {{vi}}
 
 
* {{grep}}
 
* {{grep}}
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* [[tr]]
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* [[DevOps/Ansible|Ansible]] [[lineinfile]] [[DevOps/Ansible/Modules|module]]
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* [[linux/Basic commands/grep|grep]]
  
[[Category:Linux commands]]
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[[Category:Linux]]

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