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Full Discussion: subsetting data
Top Forums UNIX for Dummies Questions & Answers subsetting data Post 302231079 by dennis.jacob on Monday 1st of September 2008 02:30:19 PM
Old 09-01-2008
There would be one limitation here..
that system will not identify whether the netry for the 4th column is missing or not, for it will consider the 5th column as 4th..One approch is that if we know that the 4th column length is 4 and fifth column length is 2 (as shown in ur example), it would be easy..

Code:
awk '{ if(length($4)==2) print; }'  filename

 

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COLRM(1)						    BSD General Commands Manual 						  COLRM(1)

NAME
colrm -- remove columns from a file SYNOPSIS
colrm [start [stop]] DESCRIPTION
The colrm utility removes selected columns from the lines of a file. A column is defined as a single character in a line. Input is read from the standard input. Output is written to the standard output. If only the start column is specified, columns numbered less than the start column will be written. If both start and stop columns are spec- ified, columns numbered less than the start column or greater than the stop column will be written. Column numbering starts with one, not zero. Tab characters increment the column count to the next multiple of eight. Backspace characters decrement the column count by one. ENVIRONMENT
The LANG, LC_ALL and LC_CTYPE environment variables affect the execution of colrm as described in environ(7). EXIT STATUS
The colrm utility exits 0 on success, and >0 if an error occurs. SEE ALSO
awk(1), column(1), cut(1), paste(1) HISTORY
The colrm command appeared in 3.0BSD. BSD
August 4, 2004 BSD
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