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Top Forums UNIX for Advanced & Expert Users Problem while counting number of fields in TAB delimited file Post 302530420 by itkamaraj on Tuesday 14th of June 2011 02:44:42 AM
Old 06-14-2011
don't store the header in the variable. (it is losing the tab )

use it like this

Code:
col_cnt=`nawk -F"\t" '{ if(NR==1) { print NF }}' $1`

Code:
bash-3.00$ cat /tmp/myfile   # tab seperated file
abcd    edfg    hijk
bash-3.00$ nawk  -F"\t" '{print $1}' /tmp/myfile
abcd
bash-3.00$ my_var=`cat /tmp/myfile | head -1`
bash-3.00$ echo $my_var  # variable loses the tab 
abcd edfg hijk
bash-3.00$ cat /tmp/myfile      # tab seperated file
abcd    edfg    hijk
bash-3.00$ echo $my_var | nawk  -F"\t" '{print $1}'   # nawk is not able to recognize the delimeter
abcd edfg hijk

This User Gave Thanks to itkamaraj For This Post:
 

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CUT(1)									FSF								    CUT(1)

NAME
cut - remove sections from each line of files SYNOPSIS
cut [OPTION]... [FILE]... DESCRIPTION
Print selected parts of lines from each FILE to standard output. Mandatory arguments to long options are mandatory for short options too. -b, --bytes=LIST output only these bytes -c, --characters=LIST output only these characters -d, --delimiter=DELIM use DELIM instead of TAB for field delimiter -f, --fields=LIST output only these fields; also print any line that contains no delimiter character, unless the -s option is specified -n with -b: don't split multibyte characters -s, --only-delimited do not print lines not containing delimiters --output-delimiter=STRING use STRING as the output delimiter the default is to use the input delimiter --help display this help and exit --version output version information and exit Use one, and only one of -b, -c or -f. Each LIST is made up of one range, or many ranges separated by commas. Each range is one of: N N'th byte, character or field, counted from 1 N- from N'th byte, character or field, to end of line N-M from N'th to M'th (included) byte, character or field -M from first to M'th (included) byte, character or field With no FILE, or when FILE is -, read standard input. AUTHOR
Written by David Ihnat, David MacKenzie, and Jim Meyering. REPORTING BUGS
Report bugs to <bug-coreutils@gnu.org>. COPYRIGHT
Copyright (C) 2002 Free Software Foundation, Inc. This is free software; see the source for copying conditions. There is NO warranty; not even for MERCHANTABILITY or FITNESS FOR A PARTICU- LAR PURPOSE. SEE ALSO
The full documentation for cut is maintained as a Texinfo manual. If the info and cut programs are properly installed at your site, the command info cut should give you access to the complete manual. cut (coreutils) 4.5.3 February 2003 CUT(1)
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