Print rows, having pattern in specific column... Post: 302359195

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Top Forums Shell Programming and Scripting Print rows, having pattern in specific column... Post 302359195 by radoulov on Tuesday 6th of October 2009 03:23:39 AM

10-06-2009

Registered User

Quote:

Originally Posted by Scrutinizer

[..] But even then it causes unnecessary processing.

Yes,
it executes the second action for every record in the first non empty input file also:

Code:

zsh-4.3.10[t]% print -l {1..1000}>pattern
zsh-4.3.10[t]% print -l A\ {1..1000}>input  
zsh-4.3.10[t]% head -3 pattern input 
==> pattern <==
1
2
3

==> input <==
A 1
A 2
A 3
zsh-4.3.10[t]% wc -l input pattern 
1000 input
1000 pattern
2000 total
zsh-4.3.10[t]% pgawk>/dev/null 'NR==FNR{_[$1]}$2 in _' pattern input 
zsh-4.3.10[t]% cat awkprof.out 
    # gawk profile, created Tue Oct  6 09:18:58 2009

    # Rule(s)

  2000  NR == FNR    { # 1000
  1000      _[$1]
    }

  2000  $2 in _    { # 1000
  1000      print $0
    }
zsh-4.3.10[t]% pgawk>/dev/null 'NR==FNR{_[$1];next}$2 in _' pattern input
zsh-4.3.10[t]% cat awkprof.out 
    # gawk profile, created Tue Oct  6 09:22:42 2009

    # Rule(s)

  2000  NR == FNR    { # 1000
  1000      _[$1]
  1000      next
    }

  1000  $2 in _    { # 1000
  1000      print $0
    }

radoulov

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LEARN ABOUT MINIX

grep

GREP(1) 						      General Commands Manual							   GREP(1)

NAME

       grep - search a file for lines containing a given pattern

SYNOPSIS

       grep [-elnsv] pattern [file] ...

OPTIONS

       -e     -e pattern is the same as pattern

       -c     Print a count of lines matched

       -i     Ignore case

       -l     Print file names, no lines

       -n     Print line numbers

       -s     Status only, no printed output

       -v     Select lines that do not match

EXAMPLES

       grep mouse file	   # Find lines in file containing mouse

       grep [0-9] file	   # Print lines containing a digit

DESCRIPTION

       Grep  searches  one  or	more  files (by default, stdin) and selects out all the lines that match the pattern.  All the regular expressions
       accepted by ed and mined are allowed.  In addition, + can be used instead of * to mean 1 or more occurrences, ? can be used to mean 0 or  1
       occurrences,  and  |  can  be used between two regular expressions to mean either one of them.  Parentheses can be used for grouping.  If a
       match is found, exit status 0 is returned.  If no match is found, exit status 1 is returned.  If an error is detected,  exit  status  2	is
       returned.

SEE ALSO

       cgrep(1), fgrep(1), sed(1), awk(9).

																	   GREP(1)