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Full Discussion: Help with xargs
Top Forums Shell Programming and Scripting Help with xargs Post 302782271 by Corona688 on Monday 18th of March 2013 12:46:20 PM
Old 03-18-2013
It's not a command, it's a special variable which determines what value(s) the shell splits and joins strings upon. Setting it to | allows me to join $1 $2 $3 ... together like "A|B|C" so I can grep for more than one thing at once -- that being the syntax egrep uses for multiple search strings. plain grep doesn't have that.

egrep also lets you group things with (). So It searches for (PID1|PID2|PID3)/, so PID1/, or PID2/, or PID3/. That way it won't accidentally match a number elsewhere in netstat, it will just look for them in the PID field where they belong.
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LEARN ABOUT LINUX

xzegrep

XZGREP(1)							     XZ Utils								 XZGREP(1)

NAME

       xzgrep - search compressed files for a regular expression

SYNOPSIS

       xzgrep [grep_options] [-e] pattern file...
       xzegrep ...
       xzfgrep ...
       lzgrep ...
       lzegrep ...
       lzfgrep ...

DESCRIPTION

       xzgrep  invokes	grep(1)  on  files  which may be either uncompressed or compressed with xz(1), lzma(1), gzip(1), or bzip2(1).  All options
       specified are passed directly to grep(1).

       If no file is specified, then standard input is decompressed if necessary and fed to grep(1).  When reading from  standard  input,  gzip(1)
       and bzip2(1) compressed files are not supported.

       If  xzgrep  is  invoked as xzegrep or xzfgrep then egrep(1) or fgrep(1) is used instead of grep(1).  The same applies to names lzgrep, lze-
       grep, and lzfgrep, which are provided for backward compatibility with LZMA Utils.

ENVIRONMENT

       GREP   If the GREP environment variable is set, xzgrep uses it instead of grep(1), egrep(1), or fgrep(1).

SEE ALSO

       grep(1), xz(1), gzip(1), bzip2(1), zgrep(1)

Tukaani 							    2010-09-27								 XZGREP(1)
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