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Top Forums UNIX for Dummies Questions & Answers While read issue... Post 302173871 by giannicello on Saturday 8th of March 2008 03:29:37 PM
Old 03-08-2008
That was a typo on my part in the example. However, the read a1 b1 c1 didn't resolve the issue. I do have it correct in my code (granted I called it s/thing totally different).

For the grep issue also, I'm wondering if the input file, when opened by a "while read", is in memory and when you do a grep of that file that has been read to a certain point, there's still a pointer in memory to that input file so then grep only sees everything after that first occurrence?

The first occurrence is like getting to the first '2' in Perderabo's example (a 'key word' I'm interested in doing more with) and trying to pull all '2's from the input file (countfile) again but grep doesn't see the first '2' anymore in the inner while...it only pulls the 2nd, 3rd, 4th occurrence, etc. when I sent the output to tmpcountfile ( grep $x countfile > tmpcountfile .... while read a1; do s/thing done<tmpcountfile).

It's hard to explain but I tried simple tests and it confirmed my issue with inner while. I opened the inner while tmpcountfile and the first occurrence is not an output from the grep when done within the inner while.
...
Gianni
 

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LEARN ABOUT SUSE

lzegrep

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 the 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 							    2009-07-05								 XZGREP(1)
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