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Top Forums UNIX for Beginners Questions & Answers Reading file and matching it from set of file Post 303004518 by Scrutinizer on Tuesday 3rd of October 2017 02:29:11 PM
Old 10-03-2017
Quote:
Originally Posted by RudiC
I'm afraid they don't:
Code:
awk ' {print FILENAME, substr($0,0,8), substr($0,1,8)}  ' unmatch 50.1 51.1
50.1 1234567 12345678
50.1 0123456 01234567

0,8 yields 7 chars, not 8, at least with my linux' mawk. In FreeBSD's awk, it seems to yield 8 chars in either case.
FWIW I could not find one awk that showed a difference, including all awk's on Solaris, AIX and HPUX. Even my version of (mawk 1.3.4 20100625) worked well.
On CentOS it worked fine as well mawk 1.3.4 20161120.

So maybe it is a bug in that particular version?


From the change log:
Code:
20090726
[..]
	+ modify workaround for (incorrect) scripts which use a zero-parameter
	  for substr to ensure the overall length of the result stays the same.
	  For example, from makewhatis:
		filename_no_gz = substr(filename, 0, RSTART - 1);


Last edited by Scrutinizer; 10-03-2017 at 10:32 PM..
 

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IGAWK(1)							 Utility Commands							  IGAWK(1)

NAME
igawk - gawk with include files SYNOPSIS
igawk [ all gawk options ] -f program-file [ -- ] file ... igawk [ all gawk options ] [ -- ] program-text file ... DESCRIPTION
Igawk is a simple shell script that adds the ability to have ``include files'' to gawk(1). AWK programs for igawk are the same as for gawk, except that, in addition, you may have lines like @include getopt.awk in your program to include the file getopt.awk from either the current directory or one of the other directories in the search path. OPTIONS
See gawk(1) for a full description of the AWK language and the options that gawk supports. EXAMPLES
cat << EOF > test.awk @include getopt.awk BEGIN { while (getopt(ARGC, ARGV, "am:q") != -1) ... } EOF igawk -f test.awk SEE ALSO
gawk(1) Effective AWK Programming, Edition 1.0, published by the Free Software Foundation, 1995. AUTHOR
Arnold Robbins (arnold@skeeve.com). Free Software Foundation Nov 3 1999 IGAWK(1)
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