Difference between revisions of "sed sed"
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This finds line that begins with exit(ignore leading spaces), then insert 'authdarmond start' before it. | This finds line that begins with exit(ignore leading spaces), then insert 'authdarmond start' before it. | ||
+ | |||
sed -i -e "/^\\s*exit/i/authdaemond start" /etc/rc.local; | sed -i -e "/^\\s*exit/i/authdaemond start" /etc/rc.local; | ||
Line 12: | Line 13: | ||
Note how replace pattern spans multiple lines | Note how replace pattern spans multiple lines | ||
+ | |||
<pre>sed -i -e '/#!\/bin\/sh/a\ | <pre>sed -i -e '/#!\/bin\/sh/a\ | ||
QMAILQUEUE="/var/qmail/bin/qmail-scanner-queue.pl" ; export QMAILQUEUE' /var/qmail/supervise/qmail-smtpd/run | QMAILQUEUE="/var/qmail/bin/qmail-scanner-queue.pl" ; export QMAILQUEUE' /var/qmail/supervise/qmail-smtpd/run | ||
+ | </pre> | ||
+ | |||
+ | == search and replace in multiple files == | ||
+ | |||
+ | This will perform a search and replace on all files in a directory tree: | ||
+ | |||
+ | <pre> | ||
+ | find ./ -type f -exec sed -i -e "s/find_this_text/replace_with_this_text/" {} \; | ||
</pre> | </pre> | ||
Revision as of 14:43, 15 January 2008
Contents
find part of a line, substitute, keep rest of time intact
sed -i -e "s/^#DatabaseDirectory \(.*\)/DatabaseDirectory \\1/" myfile.txt
find pattern in a line, insert new line before it
This finds line that begins with exit(ignore leading spaces), then insert 'authdarmond start' before it.
sed -i -e "/^\\s*exit/i/authdaemond start" /etc/rc.local;
find pattern and append line
Note how replace pattern spans multiple lines
sed -i -e '/#!\/bin\/sh/a\ QMAILQUEUE="/var/qmail/bin/qmail-scanner-queue.pl" ; export QMAILQUEUE' /var/qmail/supervise/qmail-smtpd/run
search and replace in multiple files
This will perform a search and replace on all files in a directory tree:
find ./ -type f -exec sed -i -e "s/find_this_text/replace_with_this_text/" {} \;
sed documentation
This is one of the best sed documents I found: Grymoire Sed