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Full Discussion: How to find the null member or blank in the text file?
Top Forums UNIX for Dummies Questions & Answers How to find the null member or blank in the text file? Post 302891813 by MadeInGermany on Saturday 8th of March 2014 12:12:31 PM
Old 03-08-2014
As already said, not all grep have -q.
And only GNU/Linux grep has -m1 (stop after first match).
Some grep can search for "blank" i.e. SPACE or TAB in ASCII,
the following lists the line numbers:
Code:
if output=`grep -n "^[[:blank:]]*$" file`
then
   echo "Empty lines found:
$output" | mail ...
fi

 

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LEARN ABOUT NETBSD

zfgrep

ZGREP(1)						    BSD General Commands Manual 						  ZGREP(1)

NAME

     zgrep, zegrep, zfgrep -- print lines matching a pattern in gzip-compressed files

SYNOPSIS

     zgrep [grep-flags] [--] pattern [files ...]

     zegrep [grep-flags] [--] pattern [file ...]

     zfgrep [grep-flags] [--] pattern [file ...]

DESCRIPTION

     zgrep runs grep(1) on files or stdin, if no files argument is given, after decompressing them with zcat(1).

     The grep-flags and pattern arguments are passed on to grep(1).  If an -e flag is found in the grep-flags, zgrep will not look for a pattern
     argument.

     zegrep calls egrep(1), while zfgrep calls fgrep(1).

EXIT STATUS

     In case of missing arguments or missing pattern, 1 will be returned, otherwise 0.

SEE ALSO

     egrep(1), fgrep(1), grep(1), gzip(1), zcat(1)

AUTHORS

     Thomas Klausner <wiz@NetBSD.org>

BSD
								 December 28, 2003							       BSD
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