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Full Discussion: tail, grep and cut
Top Forums Shell Programming and Scripting tail, grep and cut Post 302172299 by joeyg on Monday 3rd of March 2008 10:02:08 AM
Old 03-03-2008
Question only one command piped after a tail -f ??

Trying this out on several files, because the -f keeps the process open, appears to therefore not allow any additional commands after the first pipe.
tail -f file | grep val1 >will work
tail -f file | grep val1 | grep val2 >will not work

but,
tail file | grep val1 | grep val2 > will work
 

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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
All times are GMT -4. The time now is 01:42 PM.
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