Replacing text in multiple files: Difference between revisions
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Perhaps easiest to remember as a command. | Perhaps easiest to remember as a command. | ||
< | <syntaxhighlight lang="bash"> | ||
perl -p -i -e 's/\bgetSession\b/get_session/g' *.cpp | perl -p -i -e 's/\bgetSession\b/get_session/g' *.cpp | ||
</ | </syntaxhighlight > | ||
Where: | Where: | ||
* -p: loop | * -p: loop | ||
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=using <tt>sed</tt>= | =using <tt>sed</tt>= | ||
< | <syntaxhighlight lang="bash"> | ||
sed -i.bak 's/\bgetSession\b/get_session/g' *.cpp | sed -i.bak 's/\bgetSession\b/get_session/g' *.cpp | ||
</ | </syntaxhighlight > | ||
The <tt>\b</tt> (test for word border) in this example avoids potentially nasty substring replaces. | The <tt>\b</tt> (test for word border) in this example avoids potentially nasty substring replaces. | ||
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Note you can be useful to use alternative delimiters if you need them to avoid (some) confusion, e.g. | Note you can be useful to use alternative delimiters if you need them to avoid (some) confusion, e.g. | ||
< | <syntaxhighlight lang="bash"> | ||
sed -i.bak 's_[^/]common.css_css/common.css_g' *.html | sed -i.bak 's_[^/]common.css_css/common.css_g' *.html | ||
</ | </syntaxhighlight > | ||
(See also [[sed]]) | (See also [[sed]]) | ||
Revision as of 13:17, 23 July 2023
| 📃 These are primarily notes, intended to be a collection of useful fragments, that will probably never be complete in any sense. |
You can get string/regexp subsitution in multiple files (think code, or replacing incorrect word usage) using a few different commands
using perl
Perhaps easiest to remember as a command.
perl -p -i -e 's/\bgetSession\b/get_session/g' *.cpp
Where:
- -p: loop
- -i: edit in-place
- -e: "execute the following"
using sed
sed -i.bak 's/\bgetSession\b/get_session/g' *.cpp
The \b (test for word border) in this example avoids potentially nasty substring replaces.
The .bak argument to -i makes sed make a backup (with that extension), just in case you want to restore the old copy/copies. If you're happy (you could diff the two to check the changes) you can remove these backups.
Note you can be useful to use alternative delimiters if you need them to avoid (some) confusion, e.g.
sed -i.bak 's_[^/]common.css_css/common.css_g' *.html
(See also sed)
using replace
Written by/for MySQL, and installed only as part of it.
No regexps or guards like \b for matching words or code symbols neatly (other than " adjacent spaces ")
You can give multiple replacements, for example:
replace getSession get_session " cake " " pie " -- *.txt
Replacements are independent of each other, so you can swap, for example 'cake' with 'pie':
replace " cake " " pie " " pie " " cake " -- *.txt