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Top Forums Shell Programming and Scripting How do i use tail & grep in real time here?? Post 302798185 by hanson44 on Wednesday 24th of April 2013 02:23:17 AM
Old 04-24-2013
Yes, it will run forever. Here is another possibility if you want to stick with the tail command (if your grep supports -m option).
Code:
$ tail -f logfile | grep -m 1 word_to_find
# nothing happens
# in another window, run following:
$ echo word_to_find >> logfile
# grep finds and prints word_to_find
# in another window, run following:
$ echo something_else >> logfile
# grep exits, and tail command ends
# shell is ready to execute next command

 

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ZGREP(1)						    BSD General Commands Manual 						  ZGREP(1)

NAME
zgrep, zegrep, zfgrep -- print lines matching a pattern in gzip-compressed files SYNOPSIS
zgrep [grep-flags] [--] pattern [files ...] zegrep [grep-flags] [--] pattern [file ...] zfgrep [grep-flags] [--] pattern [file ...] DESCRIPTION
zgrep runs grep(1) on files or stdin, if no files argument is given, after decompressing them with zcat(1). The grep-flags and pattern arguments are passed on to grep(1). If an -e flag is found in the grep-flags, zgrep will not look for a pattern argument. zegrep calls egrep(1), while zfgrep calls fgrep(1). EXIT STATUS
In case of missing arguments or missing pattern, 1 will be returned, otherwise 0. SEE ALSO
egrep(1), fgrep(1), grep(1), gzip(1), zcat(1) AUTHORS
Thomas Klausner <wiz@NetBSD.org> BSD
December 28, 2003 BSD
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