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Full Discussion: Help with getting a Ctrl-C trap working w/ a piped tail -f...
Top Forums Shell Programming and Scripting Help with getting a Ctrl-C trap working w/ a piped tail -f... Post 302512558 by chatguy on Sunday 10th of April 2011 11:36:37 PM
Old 04-11-2011
MySQL [Solved] How do you get a "Ctrl-C trap" working w/ a piped "tail -f" ?
Hi All,

Although each line below seems to work by itself, I've been having trouble getting the Control-C trap working when I add the "|perl -pe..." to the end of the tail -f line, below.
(That |perl -pe statement basically just adds color to highlight the word "ERROR" while tailing a log file)

...Does anyone know how to make the 2 lines below co-exist together, so that the CTRL-C trap still works, below?
Code:
trap 'print "\033[2K\033[41;1mUSER STOPPED LOG TAIL";' ERR
tail -f /var/log/logfile.log |perl -pe 's/ERROR/\e[41;1m$&\e[0m/g'

Thank you so much for the help,
CG
Last edited by chatguy; 04-15-2011 at 02:29 AM.. Reason: [Solved]
 

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LEARN ABOUT LINUX

motd.tail

MOTD.TAIL(5)						   Debian Administrator's Manual					      MOTD.TAIL(5)

NAME

       motd.tail - Template for building the system message of the day

DESCRIPTION

       On Debian systems, the system message of the day is rebuilt at each startup, in order to display an accurate information. /etc/motd.tail is
       the file to edit permanent changes to the message of the day.

OVERVIEW

       The initiation script /etc/init.d/bootmisc.sh prepends a line containing information about the system  to  /etc/motd.tail  and  stores  the
       resulting  file in /var/run/motd. /etc/motd is a symbolic link to /var/run/motd.  This is done to prevent changes to /etc as the system can
       not assume /etc to be writable.

       Changes to /etc/motd effectively end up in a file under /var/run which will be regenerated upon reboot.

       A symbolic link to a different file, such as /etc/motd.static disables this behaviour.

FILES

       /etc/init.d/bootmisc.sh
	      The initiation script which builds /var/run/motd

       /etc/motd
	      Symbolic link to the system message of the day at /var/run/motd

       /etc/motd.tail
	      Template for building the system message of the day

       /var/run/motd
	      System message of the day file rebuilt at each computer start

SEE ALSO

       login(1), issue(5), motd(5).

Debian								    2007-04-28							      MOTD.TAIL(5)
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