Divers: Difference between revisions

Revision as of 01:27, 4 March 2008

Pour capturer les données sur le réseau:

 tcpdump -X -n -t -s 0 src 192.168.0.45

Pour afficher une image en arrière-plan (X-Windows):

 wmsetbg --center --workspace 0 image.jpeg

How to do a search and replace over multiple files?

You could use find and sed, but I find that this little line of perl works nicely:

   perl -pi -w -e 's/search/replace/g;' *.php

 -e means execute the following line of code.
 -i means edit in-place
 -w write warnings
 -p loop

Example I had the following style sheet in a section: <link rel="stylesheet" type="text/css" href="../includes/style.css">

and I wanted the following instead: <link rel="stylesheet" type="text/css" href="admin.css">

As each expression is a regular expression you've got to escape the special characters such as forward slash and . \.\.\/includes\/style\.css

So the final line of code ends up as perl -pi -w -e 's/\.\.\/includes\/style\.css/admin\.css/g;' *.php

@@ Line 13: / Line 13: @@
      perl -pi -w -e 's/search/replace/g;' *.php
--e means execute the following line of code.
+  -e means execute the following line of code.
--i means edit in-place
+  -i means edit in-place
--w write warnings
+  -w write warnings
--p loop
+  -p loop
 Example I had the following style sheet in a section: