Text Processing: Recursive search and replace: Difference between revisions
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== Recursive search with Grep == | |||
<syntaxhighlight lang="shell" line="1">grep -rni 'string or regexp' *</syntaxhighlight> | <syntaxhighlight lang="shell" line="1">grep -rni 'string or regexp' *</syntaxhighlight> | ||
Where: | Where: | ||
* <code class="noTypo">*</code> - will match to all files and directories (which doesn't start with <code class="noTypo">.</code>, alternatively you may need to use <code class="noTypo">./</code> to match everything within the current directory; | * <code class="noTypo">*</code> - will match to all files and directories (which doesn't start with <code class="noTypo">.</code>, alternatively you may need to use <code class="noTypo">./</code> to match everything within the current directory; | ||
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* <code class="noTypo">-n</code>, <code class="noTypo">--line-number</code> - output the line number where the match is found, | * <code class="noTypo">-n</code>, <code class="noTypo">--line-number</code> - output the line number where the match is found, | ||
* <code class="noTypo">-i</code>, <code class="noTypo">--ignore-case</code> - do case insensitive match. | * <code class="noTypo">-i</code>, <code class="noTypo">--ignore-case</code> - do case insensitive match. | ||
== Recursive replace with Grep, Xargs and Sed == | |||
<syntaxhighlight lang="shell" line="1">SEARCHED="string or regexp" | |||
REPLACEMENT="string"</syntaxhighlight>Dry run:<syntaxhighlight lang="shell" line="1">grep -rlZ "$SEARCHED" * | xargs -0 sed 's/${SEARCHED}/${REPLACEMENT}/g'</syntaxhighlight> | |||
<syntaxhighlight lang="shell" line="1">grep -rlZ "$SEARCHED" * | xargs -0 sed 's/${SEARCHED}/${REPLACEMENT}/g' | grep "$REPLACEMENT"</syntaxhighlight> | |||
Replace: | |||
<syntaxhighlight lang="shell" line="1">grep -rlZ "$SEARCHED" * | xargs -0 sed 's/${SEARCHED}/${REPLACEMENT}/g' -i.bak</syntaxhighlight> | |||
Where: | |||
* <code>grep</code>: <code>-Z</code>, <code>--null</code> - a data line ends in 0 byte, not newline (null delimiter); | |||
* <code>grep</code>: <code>-l</code>, <code>--files-with-matches</code> - print only names of FILEs with selected lines; | |||
* <code>xargs</code>: <code>-0</code> <code>--null</code> - items are separated by a null, not white-space; disables quote and backslash processing and logical EOF processing; | |||
* <code>sed</code>: <code>s</code> - substitute <code>/old/new/</code>, <code>g</code> - all matches to the end of the line; <code>-i.bak</code> do the changes in place and create a backup file. | |||
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| Прндл = Linux Server | | Прндл = Linux Server | ||
Revision as of 11:56, 4 August 2022
Recursive search with Grep
grep -rni 'string or regexp' *
Where:
*– will match to all files and directories (which doesn't start with., alternatively you may need to use./to match everything within the current directory;-r,--recursive– in this case works together with*(or./);-n,--line-number– output the line number where the match is found,-i,--ignore-case– do case insensitive match.
Recursive replace with Grep, Xargs and Sed
SEARCHED="string or regexp"
REPLACEMENT="string"
Dry run:
grep -rlZ "$SEARCHED" * | xargs -0 sed 's/${SEARCHED}/${REPLACEMENT}/g'
grep -rlZ "$SEARCHED" * | xargs -0 sed 's/${SEARCHED}/${REPLACEMENT}/g' | grep "$REPLACEMENT"
Replace:
grep -rlZ "$SEARCHED" * | xargs -0 sed 's/${SEARCHED}/${REPLACEMENT}/g' -i.bak
Where:
grep:-Z,–null– a data line ends in 0 byte, not newline (null delimiter);grep:-l,–files-with-matches– print only names of FILEs with selected lines;xargs:-0–null– items are separated by a null, not white-space; disables quote and backslash processing and logical EOF processing;sed:s– substitute/old/new/,g– all matches to the end of the line;-i.bakdo the changes in place and create a backup file.
