Sed: Difference between revisions

Revision as of 23:34, 9 February 2014

sed 's/<search>/<replace>/g'

sed -e 's/<[^>]*>//g' <file>

sed 's/\(.*\)\..*/\1/'

eg:

echo "house.txt" | sed 's/\(.*\)\..*/\1/'  # returns 'house'

sed '/someline/d'

Using the above tips, you can modify a file directly by using the -i parameter, with the filename as the second argument:

sed -i "search" /path/to/file

Use: 0,/<regex>/s//<replacement text where \0 is the found line>/

# Add a password line before the first title entry in the grub.conf file.
sed -i "0,/^title/s//password --encrypted $Password\n\n\0/" $GrubConfig

To append after, just put \0 before your replacement text.

@@ Line 22: / Line 22: @@
 Using the above tips, you can modify a file directly by using the <code>-i</code> parameter, with the filename as the second argument:
   sed -i "search" /path/to/file
+== Inserting a Line Before/After a Match ==
+Use: <code>0,/<regex>/s//<replacement text where \0 is the found line>/</code>
+ # Add a password line before the first title entry in the grub.conf file.
+ sed -i "0,/^title/s//password --encrypted $Password\n\n\0/" $GrubConfig
+To append after, just put \0 before your replacement text.
 [[Category:Linux]]
 [[Category:TipsnTricks]]
 [[Category:Code]]