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Full Discussion: Break out of tail -f
Top Forums Shell Programming and Scripting Break out of tail -f Post 302779433 by DGPickett on Tuesday 12th of March 2013 04:08:38 PM
Old 03-12-2013
I believe the $? of grep tells you if it found any. Some grep's have -q for quiet, as $? is the answer. grep -c will give you the line count without the file or wc.

In place of nohup,out, you could have a log for each run appname.YYYY-MM-DD_HH:MM:SS that tells you the start time. Two startups would be two files unless they started the same second (can add .$$ to the end for that!) Each file being the product on one run makes thing easier to understand. The default nohup.out is nice for little adhoc things, and oversights, but normally "(...) >logname 2>&1" keeps nohup.out empty and every command in the parens uses that log unless it redirects to another. In a big shop, it is nice to have a shared log for start and end or abort lines and separate logs for each run, separate dirs for each app.
 

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LEARN ABOUT CENTOS

nohup

NOHUP(1)							   User Commands							  NOHUP(1)

NAME

       nohup - run a command immune to hangups, with output to a non-tty

SYNOPSIS

       nohup COMMAND [ARG]...
       nohup OPTION

DESCRIPTION

       Run COMMAND, ignoring hangup signals.

       --help display this help and exit

       --version
	      output version information and exit

       If  standard  input is a terminal, redirect it from /dev/null.  If standard output is a terminal, append output to 'nohup.out' if possible,
       '$HOME/nohup.out' otherwise.  If standard error is a terminal, redirect it to standard output.  To save output to FILE, use 'nohup  COMMAND
       > FILE'.

       NOTE: your shell may have its own version of nohup, which usually supersedes the version described here.  Please refer to your shell's doc-
       umentation for details about the options it supports.

       GNU coreutils online help: <http://www.gnu.org/software/coreutils/> Report nohup translation bugs to <http://translationproject.org/team/>

AUTHOR

       Written by Jim Meyering.

COPYRIGHT

       Copyright (C) 2013 Free Software Foundation, Inc.  License GPLv3+: GNU GPL version 3 or later <http://gnu.org/licenses/gpl.html>.
       This is free software: you are free to change and redistribute it.  There is NO WARRANTY, to the extent permitted by law.

SEE ALSO

       The full documentation for nohup is maintained as a Texinfo manual.  If the info and nohup programs are properly installed  at  your  site,
       the command

	      info coreutils 'nohup invocation'

       should give you access to the complete manual.

GNU coreutils 8.22						     June 2014								  NOHUP(1)
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