Full Discussion: Strange output from grep
Top Forums UNIX for Dummies Questions & Answers Strange output from grep Post 57760 by Bab00shka on Friday 5th of November 2004 11:29:57 AM
It came out with the same output

$echo 000000 |/usr/bin/egrep -v [0-1][0-9][0-5][0-9][0-5][0-9]
000000

I also tried this which was interesting:

$echo 000000 |/usr/bin/egrep -v [0-1]
$echo 000000 |/usr/bin/egrep -v [0-1][0-9]
$echo 000000 |/usr/bin/egrep -v [0-1][0-9][0-5]
$echo 000000 |/usr/bin/egrep -v [0-1][0-9][0-5][0-9]
$echo 000000 |/usr/bin/egrep -v [0-1][0-9][0-5][0-9][0-5]
$echo 000000 |/usr/bin/egrep -v [0-1][0-9][0-5][0-9][0-5][0-9]
000000
$

Its bizarre. Smilie
 
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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), bzip2(1), or lzop(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), bzip2(1), and lzop(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), lzop(1), zgrep(1) Tukaani 2011-03-19 XZGREP(1)

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