07-24-2018
The -q flag makes grep avoid producing output, so it is doing what you ask. There will therefore not be any input to the second (or third) grep in the pipeline. The return code will be from the final grep -vi "exception" for which there is no input, therefore you get an eror return code - it didn't find any lines that did not have the word exception in them, in fact no lines at all. Are you looking for records that match the three conditions, but don't want to display them?
Try moving the -q to the final grep in the pipeline and see if that helps.
Kind regards,
Robin
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NAME
zgrep - search possibly compressed files for a regular expression
SYNOPSIS
zgrep [ grep_options ] [ -e ] pattern filename...
DESCRIPTION
Zgrep is used to invoke the grep on compress'ed or gzip'ed files. All options specified are passed directly to grep. If no file is speci-
fied, then the standard input is decompressed if necessary and fed to grep. Otherwise the given files are uncompressed if necessary and
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If zgrep is invoked as zegrep or zfgrep then egrep or fgrep is used instead of grep. If the GREP environment variable is set, zgrep uses
it as the grep program to be invoked. For example:
for sh: GREP=fgrep zgrep string files
for csh: (setenv GREP fgrep; zgrep string files)
AUTHOR
Charles Levert (charles@comm.polymtl.ca)
SEE ALSO
grep(1), egrep(1), fgrep(1), zdiff(1), zmore(1), znew(1), zforce(1), gzip(1), gzexe(1)
ZGREP(1)