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Full Discussion: While loop seems to exit when blank line is met
Top Forums UNIX for Dummies Questions & Answers While loop seems to exit when blank line is met Post 302421994 by methyl on Monday 17th of May 2010 08:42:16 AM
Old 05-17-2010
The test data posted contains one line which contains just one space character. The line is not blank.

This line of script is likely to be the problem:

Quote:
RESULT=$(grep $EachLine2 $DATA_DIR/cells*.dat | cut -d, -f2)
The variable $EachLine2 is not quoted. If it contains a space character or nothing it effectively disappears.
Where $DATA_DIR/cells*.dat expands to more than one filename the grep is still syntactically correct even if $EachLine2 is blank or spaces in which case the first filename gets treated as a regular expression by grep !

To see what $DATA_DIR/cells*.dat expands to, try a plain echo on the variable.
 

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LEARN ABOUT REDHAT

bzgrep

BZGREP(1)						      General Commands Manual							 BZGREP(1)

NAME

       bzgrep, bzfgrep, bzegrep - search possibly bzip2 compressed files for a regular expression

SYNOPSIS

       bzgrep [ grep_options ] [ -e ] pattern filename...
       bzegrep [ egrep_options ] [ -e ] pattern filename...
       bzfgrep [ fgrep_options ] [ -e ] pattern filename...

DESCRIPTION

       Bzgrep  is  used to invoke the grep on bzip2-compressed files. All options specified are passed directly to grep.  If no file is specified,
       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  bzgrep  is  invoked as bzegrep or bzfgrep then egrep or fgrep is used instead of grep.  If the GREP environment variable is set, bzgrep
       uses it as the grep program to be invoked. For example:

	   for sh:  GREP=fgrep	bzgrep string files
	   for csh: (setenv GREP fgrep; bzgrep string files)

AUTHOR

       Charles Levert (charles@comm.polymtl.ca). Adapted to bzip2 by Philippe Troin <phil@fifi.org> for Debian GNU/Linux.

SEE ALSO

       grep(1), egrep(1), fgrep(1), bzdiff(1), bzmore(1), bzless(1), bzip2(1)

																	 BZGREP(1)
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