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Full Discussion: Unsure of sed notation (nu\\t.\*)
Top Forums Shell Programming and Scripting Unsure of sed notation (nu\\t.\*) Post 302540464 by alister on Wednesday 20th of July 2011 04:52:58 PM
Old 07-20-2011
Quote:
Originally Posted by czar21
Code:
sed s:nu\\t.\*:"nu=0"

You must have garbled the code while posting. That's not a valid sed command since the substitute command is unterminated.

If we add a : at the end, then at least we have something that makes sense to at least one sed implementation, GNU sed. Even so, I'm inclined to believe that whoever wrote that is deranged and/or trying to intentionally confuse the reader.

If single quotes were used to protect the sed script, all but one of the backslashes and all of the double quotes would not be needed. There's also no need to use the non-default delimiter (colon) since there are no forward slashes in the command. A much clearer version:
Code:
sed 's/nu\t.*/nu=0/'

What does that mean then? \t is an undefined sequence in POSIX sed. GNU sed treats it as an extension which matches a tab character. So, assuming GNU sed, it replaces nu<tab><optional misc characters><end of line> with nu=0<end of line>.

Regards,
Alister
 

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LEARN ABOUT DEBIAN

jsonbot

JSONBOT(1)							    jsb manual								JSONBOT(1)

NAME

       JSONBOT - The JSON everywhere bot!

SYNOPSIS

       JSONBOT is a remote event-driven framework for building bots that talk JSON to each other over XMPP. This manual page documents briefly the
       jsb distribution..

DESCRIPTION

       This distribution provides bots built on this framework for console, IRC, XMPP, Convore and WWW on the shell.

USAGE

       JSONBOT uses command line options to configure a bot. See the --help option to get more help on a command options or see the  corresponding
       man page.

       the jsb pakage contains the following programs:

	   * jsb - console version of jsb
	   * jsb-backup - create backup of JSONBOT datadir
	   * jsb-convore - convore version of jsb
	   * jsb-init - create data directory and config examples, default ~/.jsb
	   * jsb-irc - IRC version of jsb
	   * jsb-fleet - mix IRC and XMPP bots
	   * jsb-sed - sed a whole directory
	   * jsb-stop - stop a running bot
	   * jsb-tornado - a shell web server based on tornado
	   * jsb-udp - send udp packets to the bot that will relay the data
	   * jsb-xmpp - XMPP version of jsb

       note: JSONBOT is in BETA stage right now and still subject to change of protocols and API.

       see http://jsonbot.googlecode.com.  see https://jsonbot.org for documentation on the bot.

SEE ALSO

       The program is documented fully on http://jsonbot.org or see http://jsonbot.googlecode.com

SEE ALSO

       jsb(1), jsb-backup(1), jsb-init(1), jsb-irc(1), jsb-xmpp(1), jsb-fleet(1), jsb-tornado(1),  jsb-stop(1), jsb-udp(1)

AUTHOR

       This manual page was written by Bart Thate <bthate@gmail.com>, for the Debian GNU/Linux system (but may be used by others).

Debian GNU/Linux						    22 Nov 2011 							JSONBOT(1)
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