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Top Forums Shell Programming and Scripting Simple grep is not working properly on busybox Post 302909995 by Don Cragun on Monday 21st of July 2014 10:01:12 PM
Old 07-21-2014
In the standards, the behavior of grep is only defined when the operands are text files. One use of the .pgn extension is for Portable Game Notation files, but the names you showed us don't sound like game status files. If these are some kind of (binary) graphics files, your version of grep may be rejecting them.

Did you just try:
Code:
grep FEN test

or did your also try one or both of:
Code:
grep FEN sample_test_50_diag_011.pgn
grep FEN sample_50_diag_012.pgn

?
 

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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 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 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)
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