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Top Forums Shell Programming and Scripting Help with merge data at same column but different row inquiry Post 302963638 by Aia on Monday 4th of January 2016 01:21:55 PM
Old 01-04-2016
Quote:
Originally Posted by looney
hi Disedorgue,
in code
Code:
awk '{B=A;A=$0};NR > 1 && $0=B"#"A ' file

I got the code how it is working but i have a doubt.In the highlighted part how pattern matching and action is being performed together?. && is between action and pattern matching.As we know that action is performed in braces , otherwise default action is print $0 if braces are not used.Kindly explain.
Hi looney,

All the highlighted part is pattern, so it will be the equivalent of:
Code:
NR > 1 && $0=B"#"A {print $0}

If every term of the pattern evaluates to true print the whole record. The interesting bit is that if NR == 1 (first line) it will be false and the other expression is not evaluated, therefore $0 never gets modified as B"#"A, nor it gets printed.

Last edited by Aia; 01-05-2016 at 05:35 PM..
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FC-PATTERN(1)															     FC-PATTERN(1)

NAME
fc-pattern - parse and show pattern SYNOPSIS
fc-pattern [ -cdVh ] [ --config ] [ --default ] [ [ -f format ] [ --format format ] ] [ --version ] [ --help ] [ pattern [ element... ] ] DESCRIPTION
fc-pattern parses pattern (empty pattern by default) and shows the parsed result. If --config is given, config substitution is performed on the pattern before being displayed. If --default is given, default substitution is performed on the pattern before being displayed. If any elements are specified, only those are printed. OPTIONS
This program follows the usual GNU command line syntax, with long options starting with two dashes (`-'). A summary of options is included below. -c Perform config substitution on pattern. -d Perform default substitution on pattern. -f Format output according to the format specifier format. -V Show version of the program and exit. -h Show summary of options. pattern Parses and displays pattern (uses empty pattern by default). element If set, the element property is displayed for parsed pattern. SEE ALSO
FcNameParse(3) FcConfigSubstitute(3) FcDefaultSubstitute(3) FcPatternPrint(3) FcPatternFormat(3) fc-cat(1) fc-cache(1) fc-list(1) fc- match(1) fc-query(1) fc-scan(1) The fontconfig user's guide, in HTML format: /usr/share/doc/fontconfig/fontconfig-user.html. AUTHOR
This manual page was updated by Behdad Esfahbod <behdad@behdad.org>. Apr 20, 2010 FC-PATTERN(1)
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