The following seems to do what you want just using standard sed features:
The \1 and \2 in the replacement string in the substitute command are back references that are replaced by the strings matched by the BREs between the escaped sets of parentheses, respectively.
Using unescaped parentheses (as in RudiC's suggestion) is a GNU extension that is not allowed in the standards. The sed -r option is not included in the standards, but is allowed as an extension.
When I was using Solaris systems, I would have done this using /usr/xpg4/bin/sed, but I don't think there is anything in the above commands that won't work with /bin/sed or /usr/bin/sed.
These 3 Users Gave Thanks to Don Cragun For This Post:
Thanks for giving your time and effort to answer questions and helping newbies like me understand awk.
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Discussion started by: svn
5 Replies
LEARN ABOUT DEBIAN
transmission-edit
TRANSMISSION-EDIT(1) BSD General Commands Manual TRANSMISSION-EDIT(1)NAME
transmission-edit -- command-line utility to modify .torrent files' announce URLs
SYNOPSIS
transmission-edit [-h] [-a url] [-d url] [-r search replace] torrentfile(s)
DESCRIPTION
transmission-edit command-line utility to modify .torrent files' announce URLs
OPTIONS -h --help
Show a short help page and exit.
-a --add URL
Add an announce URL to the torrent's announce-list if it's not already in the list
-d --delete URL
Remove an announce URL from the torrent's announce-list
-r --replace search replace
Substring search-and-replace inside a torrent's announce URLs. This can be used to change an announce URL when the tracker moves or
your passcode changes.
EXAMPLES
Update a tracker passcode in all your torrents:
$ transmission-edit -r old-passcode new-passcode ~/.config/transmission/torrents/*.torrent
AUTHORS
Jordan Lee
SEE ALSO transmission-create(1), transmission-daemon(1), transmission-edit(1), transmission-gtk(1), transmission-qt(1), transmission-remote(1),
transmission-show(1)
http://www.transmissionbt.com/
BSD June 9, 2010 BSD