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Full Discussion: Grep command in a loop
Top Forums UNIX for Beginners Questions & Answers Grep command in a loop Post 303017477 by Corona688 on Wednesday 16th of May 2018 01:37:53 PM
Old 05-16-2018
It'd be much better to watch the return code of the script if you can. Usually it will return 0 for success, anything else for error.

You can do
Code:
tail -f build.log | grep -l -q "Build Successful"

but if "Build Successful" never appears, it will wait forever.

The same problem faces any approach really. Without some way to tell when it's failed, it has no termination condition.
This User Gave Thanks to Corona688 For This Post:
RavinderSingh13
 

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LEARN ABOUT SUSE

iptraf

IPTRAF(8)						      System Manager's Manual							 IPTRAF(8)

NAME

       iptraf - Interactive Colorful IP LAN Monitor

SYNOPSIS

       iptraf { [ -f ] [ -q ] [ { -i iface | -g | -d iface | -s iface | -z iface | -l iface } [ -t timeout ] [ -B [ -L logfile ] ] ] | [ -h ] }

DESCRIPTION

       iptraf  is an ncurses-based IP LAN monitor that generates various network statistics including TCP info, UDP counts, ICMP and OSPF informa-
       tion, Ethernet load info, node stats, IP checksum errors, and others.

       If the command is issued without any command-line options, the program comes up in interactive mode, with the various  facilities  accessed
       through the main menu.

OPTIONS

       These options can also be supplied to the command:

       -i iface
	      immediately start the IP traffic monitor on the specified interface, or all interfaces if "-i all" is specified

       -g     immediately start the general interface statistics

       -d iface
	      allows you to immediately start the detailed on the indicated interface (iface)

       -s iface
	      allows you to immediately monitor TCP and UDP traffic on the specified interface (iface)

       -z iface
	      shows packet counts by size on the specified interface

       -l iface
	      start the LAN station monitor on the specified interface, or all LAN interfaces if "-l all" is specified

       -t timeout
	      tells IPTraf to run the specified facility for only timeout minutes.  This option is used only with one of the above parameters.

       -B     redirect	standard output to /dev/null, closes standard input, and forks the program into the background.  Can be used only with one
	      of the facility invocation parameters above.  Send the backgrounded process a USR2 signal to terminate.

       -L logfile
	      allows you to specify an alternate log file name.  The default log file name is based on either  the  interface  selected  (detailed
	      interface  statistics,  TCP/UDP service statistics, packet size breakdown), or the instance of the facility (IP traffic monitor, LAN
	      station monitor).  If a path is not specified, the log file is placed in /var/log/iptraf

       -f     clears all locks and counters, causing this instance of IPTraf to think it's the first one running.  This should	only  be  used	to
	      recover from an abnormal termination or system crash.

       -q     no longer needed, maintained only for compatibility.

       -h     shows a command summary

SIGNALS

	SIGUSR1 - rotates log files while program is running
	SIGUSR2 - terminates an IPTraf process running in the background.

FILES

	/var/log/iptraf/*.log - log file
	/var/local/iptraf/* - important IPTraf data files

SEE ALSO

	Documentation/* - complete documentation written by the author

AUTHOR

       Gerard Paul Java (riker@mozcom.com)

MANUAL AUTHOR

       Frederic Peters (fpeters@debian.org), using iptraf --help General manual page modifications by Gerard Paul Java (riker@mozcom.com)

								 IPTraf Help Page							 IPTRAF(8)
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