VIM

• Search and replace!

Replace every occurrence of the word foo with bar on current line:

:s/foo/bar/g

Replace every occurrence of the word foo with bar in the whole file:

:%s/foo/bar/g

The same as above, but ignore the case of the pattern you want to substitute. This replaces foo, FOO, Foo, and so on:

:%s/foo/bar/gi

Confirm every substitution:

:%s/foo/bar/gc

For each line on the file, replace the first occurrence of foo with bar and confirm every substitution:

:%s/foo/bar/c

• To force PHP-style syntax highlighting in a file that doesn't have the .php extension, include the following somewhere within a <?php ... ?> section:

// vim:ft=php

• To change file format from DOS-style to UNIX-style, from inside VIM issue this command:

:set ff=unix