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Full Discussion: Confusing sed error message
Top Forums Shell Programming and Scripting Confusing sed error message Post 303027506 by Ralph on Monday 17th of December 2018 05:00:24 PM
Old 12-17-2018
Thanks. That worked well.

I also modified my script to avoid duplicates in the first place, using an array to save filenames and compare them to incoming new ones.

It is reassuring that the results are the same as with awk '!A[$2,$3]++ && !A[$3,$2]++' file.

Now spending some time with awk to figure out what that actually does...

--- Post updated at 10:00 PM ---

Quote:
Originally Posted by Scrutinizer
Assuming the fields in your input file are whitespace separated, you could try this approach:
Code:
awk '!A[$2,$3]++ && !A[$3,$2]++' file

Hm...
I converted this, with some trial and error, into what I think an awk program would look like:
Code:
#!/usr/bin/awk -f
{
#       !A[$2,$3]++ && !A[$3,$2]++
        !A[$2 " " $3]++ && !A[$3 " " $2]++
}
END {
        for ( i in A ){
                if ( A[i] == 1 )
                print A[i], i;
        }
}

Two questions:
1) If I keep the A[$2,$3] and A[$3,$2] then the output produces a funny character between the two filenames but the command line version works fine. What is the problem?
2) How does the command line version know to print only those keys (i) for which the count is 1?

I'm using GNU Awk 4.1.4, API: 1.1 (GNU MPFR 3.1.5, GNU MP 6.1.2)

(I'll figure it out somehow but it's getting late and it doesn't hurt to ask.)
Thanks.
Last edited by Ralph; 12-17-2018 at 06:29 PM..
 

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LEARN ABOUT LINUX

shtool-subst

SHTOOL-SUBST.TMP(1)					      GNU Portable Shell Tool					       SHTOOL-SUBST.TMP(1)

NAME

       shtool-subst - GNU shtool sed(1) substitution operations

SYNOPSIS

       shtool subst [-v|--verbose] [-t|--trace] [-n|--nop] [-w|--warning] [-q|--quiet] [-s|--stealth] [-i|--interactive] [-b|--backup ext]
       [-e|--exec cmd] [-f|--file cmd-file] [file] [file ...]

DESCRIPTION

       This command applies one or more sed(1) substitution operations to stdin or any number of files.

OPTIONS

       The following command line options are available.

       -v, --verbose
	   Display some processing information.

       -t, --trace
	   Enable the output of the essential shell commands which are executed.

       -n, --nop
	   No operation mode. Actual execution of the essential shell commands which would be executed is suppressed.

       -w, --warning
	   Show warning on substitution operation resulting in no content change on every file. The default is to show a warning on substitution
	   operations resulted in no content change on all files.

       -q, --quiet
	   Suppress warning on substitution operation resulting in no content change.

       -s, --stealth
	   Stealth operation. Preserve timestamp on file.

       -i, --interactive
	   Enter interactive mode where the user has to approve each operation.

       -b, --backup ext
	   Preserve backup of original file using file name extension ext.  Default is to overwrite the original file.

       -e, --exec cmd
	   Specify sed(1) command directly.

       -f, --file cmd-file
	   Read sed(1) command from file.

EXAMPLE

	#   shell script
	shtool subst -i -e 's;(c) ([0-9]*)-2000;(c) 1-2001;' *.[ch]

	#    RPM spec-file
	%install
	    shtool subst -v -n 
		-e 's;^(prefix=).*;1 $RPM_BUILD_ROOT%{_prefix};g' 
		-e 's;^(sysconfdir=).*;1 $RPM_BUILD_ROOT%{_prefix}/etc;g' 
		`find . -name Makefile -print`
	    make install

HISTORY

       The GNU shtool subst command was originally written by Ralf S.  Engelschall <rse@engelschall.com> in 2001 for GNU shtool.  It was prompted
       by the need to have a uniform and convenient patching frontend to sed(1) operations in the OpenPKG package specifications.

SEE ALSO

       shtool(1), sed(1).

18-Jul-2008							   shtool 2.0.8 					       SHTOOL-SUBST.TMP(1)
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