Editing Sed (editor)

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<code>[[wikipedia:sed]]</code> ([[1974]]) utility is using for text processing, such as strings replacements.
* Man: https://man7.org/linux/man-pages/man1/sed.1p.html

 sed /xxx/yyy/g

   g - global 
 [[-i]]

 [[brew install gnu-sed]]


== Sed Basic examples ==

* [[Replace]] all occurrences of TEXT_STRING (<code>/g</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

== 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]]
* [[Redirection]]: [[double redirection]]
* [[file (Puppet)]]
* [[prepend]]
* [[kubectl patch]]

== See also ==
* {{sed}}
* {{vi}}
* {{grep}}

[[Category:Linux commands]]