awk: switching lines and concatenating lines? Post: 302408188

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Top Forums Shell Programming and Scripting awk: switching lines and concatenating lines? Post 302408188 by alister on Sunday 28th of March 2010 03:38:25 PM

03-28-2010

Registered User

For the best help possible, you should post the entire pipeline (your filter).

Your awk code appears to delete lines that end in "pause" or contain "continue" because when a continue line is found, and you look up $1$2 in the array, there is never a match. $1$2 for the continue line is equal to a key value followed by the word "continue". None of the pause lines will match that as the second field begins with a number. You need to key on $1 alone, not $1 and $2.

Tweaking your code:

Code:

awk '/pause$/ {array[$1]=$0; next}/continue/ {if($1 in array) print array[$1] $0; delete array[$1]; next}{ print $0 }'

... but, that's just a more verbose version of Franklin52's solution above.

This approach will reorder the lines a bit, because while the array holds a pause line until its continue is found, other lines may print, effectively moving a pause line further down the sequence.

Alister

Last edited by alister; 03-28-2010 at 04:50 PM..

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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)

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