Differences between version 22 and revision by previous author of PerlOneLiners.
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| Newer page: | version 22 | Last edited on Wednesday, June 9, 2004 10:57:42 pm | by AristotlePagaltzis | Revert |
| Older page: | version 21 | Last edited on Wednesday, June 9, 2004 8:46:30 pm | by JohnMcPherson | Revert |
@@ -5,11 +5,9 @@
!! Perl pie
perl -pi -e 's/foo/bar/' file
-Does an inplace sed
on the file. [GNU] sed(1) v4 also supports this with -i. The advantage of using perl instead
-of sed is for use of perl
's RegularExpressions if you
are more familiar with them
than the [POSIX] ones used
by sed
.
-(If you only need a simple query and replacement,
sed will probably be quicker
).
+Does an inplace [SED]
on the file. [GNU] sed(1) v4 also supports this with __
-i__ and will probably be quicker if you only need a simple query and replacement
. However, [Perl]
's [RegularExpression]s
are more powerful and easier on the hands
than the [POSIX] variety offered
by [SED]
. With [GNU]
sed(1
), you can use the __-r__ switch to get an extended RegularExpression syntax which also requires fewer backslashes than the [POSIX] flavour
.
!! Removing empty lines from a file
perl -ni.bak -e'/\S/ && print' file1 file2
