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Top Forums Shell Programming and Scripting Need to delete previous lines Post 302441102 by linuxkid on Thursday 29th of July 2010 09:46:07 AM
Old 07-29-2010
Quote:
Originally Posted by zaxxon
Code:
$> awk 'NF==1 {if(a)print a; a=$0} NF==3 {print; a=""}' infile
one two three
one
two
four five six
four
five
seven eight nine
seven
eight
one two three

I changed your subject slightly so others might easier find or identify this thread.
my mistake, but with the input file some lines have 2 words on it (can be any word), whilst others may have jsut the one on it. I tried replacing the NF==1 with NF==2 but that didn't work properly, as it deleted two lines if the one directly above had 1 field and the one above that had 2, though if the one above only had 2 words, then it worked ok!
 

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WC(1)								   User Commands							     WC(1)

NAME
wc - print newline, word, and byte counts for each file SYNOPSIS
wc [OPTION]... [FILE]... wc [OPTION]... --files0-from=F DESCRIPTION
Print newline, word, and byte counts for each FILE, and a total line if more than one FILE is specified. With no FILE, or when FILE is -, read standard input. -c, --bytes print the byte counts -m, --chars print the character counts -l, --lines print the newline counts --files0-from=F read input from the files specified by NUL-terminated names in file F; If F is - then read names from standard input -L, --max-line-length print the length of the longest line -w, --words print the word counts --help display this help and exit --version output version information and exit AUTHOR
Written by Paul Rubin and David MacKenzie. REPORTING BUGS
Report wc bugs to bug-coreutils@gnu.org GNU coreutils home page: <http://www.gnu.org/software/coreutils/> General help using GNU software: <http://www.gnu.org/gethelp/> COPYRIGHT
Copyright (C) 2009 Free Software Foundation, Inc. License GPLv3+: GNU GPL version 3 or later <http://gnu.org/licenses/gpl.html>. This is free software: you are free to change and redistribute it. There is NO WARRANTY, to the extent permitted by law. SEE ALSO
The full documentation for wc is maintained as a Texinfo manual. If the info and wc programs are properly installed at your site, the com- mand info coreutils 'wc invocation' should give you access to the complete manual. GNU coreutils 7.1 July 2010 WC(1)
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