06-19-2008
Probably a quoting issue; if $pid2 is the empty string then you get a syntax error for grep -v $pid2 but it's easy to fix: grep -v "$pid2" with double quotes around the variable (always when using variables, as a strong recommendation). However, you also need to watch out for grep -v "" because it will remove all lines. As a workaround, you could use "${pid2:-nosuchstringmadam}" to replace an empty variable value with an unlikely default string.
As an aside, you can also simplify the long string of greps with egrep -v "$pid1|$pid2|$pid3" etc. And of course, cat file | grep something is always possible to write as grep something file (the purpose of cat is to catenate multiple files together; using it on a single file is usually misdirected).
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GZGREP(1) General Commands Manual GZGREP(1)
NAME
gzgrep, gzegrep, gzfgrep - search possibly compressed files for a regular expression
SYNOPSIS
gzgrep [ grep_options ] [ -e ] pattern filename...
DESCRIPTION
gzgrep 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
fed to grep.
If gzgrep is invoked as gzegrep or gzfgrep then egrep or fgrep is used instead of grep. If the GREP environment variable is set, gzgrep
uses it as the grep program to be invoked. For example:
for sh: GREP=fgrep gzgrep string files
for csh: (setenv GREP fgrep; gzgrep string files)
AUTHOR
Charles Levert (charles@comm.polymtl.ca)
SEE ALSO
grep(1), egrep(1), fgrep(1), gzdiff(1), gzmore(1), gznew(1), gzforce(1), gzip(1), gzexe(1)
ATTRIBUTES
See attributes(5) for descriptions of the following attributes:
+--------------------+-----------------+
| ATTRIBUTE TYPE | ATTRIBUTE VALUE |
+--------------------+-----------------+
|Availability | SUNWgzip |
+--------------------+-----------------+
|Interface Stability | External |
+--------------------+-----------------+
NOTES
Source for gzip is available in the SUNWgzipS package.
GZGREP(1)