02-06-2013
If the ps in Don's pipeline obtains the process listing after the grep processes in the pipeline have been created, the pid of grep 'CAL255.4ge, if run by wilruiz0, will be part of the result. The grep -v grep filters it out.
However, since by the time that kill is invoked the grep processes are gone, it's highly unlikely that the pid will be valid (highly unlikely, but it's not impossible that another process could have been created with that same pid).
Regards,
Alister
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ZGREP(1) General Commands Manual ZGREP(1)
NAME
zgrep - search possibly compressed files for a regular expression
SYNOPSIS
zgrep [ grep_options ] [ -e ] pattern filename...
DESCRIPTION
Zgrep invokes grep on compressed or gzipped files. These grep options will cause zgrep to terminate with an error code:
(-[drRzZ]|--di*|--exc*|--inc*|--rec*|--nu*). All other options specified are passed directly to grep. If no file is specified, then the
standard input is decompressed if necessary and fed to grep. Otherwise the given files are uncompressed if necessary and fed to grep.
If the GREP environment variable is set, zgrep uses it as the grep program to be invoked.
EXIT CODE
2 - An option that is not supported was specified.
AUTHOR
Charles Levert (charles@comm.polymtl.ca)
SEE ALSO
grep(1), gzexe(1), gzip(1), zdiff(1), zforce(1), zmore(1), znew(1)
ZGREP(1)