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Top Forums Shell Programming and Scripting remove column and store output to a variable Post 302450713 by loperam on Friday 3rd of September 2010 02:16:54 PM
Old 09-03-2010
remove column and store output to a variable

Hello guys

I need to run a script to remove the last column of different comma separated files.
The problem is that the number of columns of my files will be different and I won't know that number every time i run my script.

Is there any command I can use to remove the last column without specifying its number?
I can use cut but only when I know the column position.

I was trying another approach. If I calculate the number of the last column then I could use cut.
To find the last column I use:
Code:
cat filename | awk 'BEGIN {FS=","} END {print NF}'

but now I have the problem of how do I store that value in a variable so I can use cut?
If I use:
Code:
position='cat filename | awk 'BEGIN {FS=","} END {print NF}' '

I get this error: bash: FS=,: command not found

Thanks in advance

loperam

Last edited by Scott; 09-03-2010 at 03:36 PM.. Reason: Please use code tags
 

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CUT(1)							      General Commands Manual							    CUT(1)

NAME
cut - select out columns of a file SYNOPSIS
cut [ -b | -c] list [file...] cut -f list [-d delim] [ -s] OPTIONS
-b Cut specified bytes -c Select out specific characters -d Change the column delimiter to delim -f Select out specific fields that are separated by the -i Runs of delimiters count as one -s Suppres lines with no delimiter characters, when used EXAMPLES
cut -f 2 file # Extract field 2 cut -c 1-2,5 file # Extract character columns 1, 2, and 5 cut -c 1-5,7- file # Extract all columns except 6 DESCRIPTION
[file...]" delimiter character ( see delim)" with the -f option. Lines with no delimiters are passwd through untouched" Cut extracts one or more fields or columns from a file and writes them on standard output. If the -f flag is used, the fields are sepa- rated by a delimiter character, normally a tab, but can be changed using the -d flag. If the -c flag is used, specific columns can be specified. The list can be comma or BLANK separated. The -f and -c flags are mutually exclusive. Note: The POSIX1003.2 standard requires the option -b to cut out specific bytes in a file. It is intended for systems with multi byte characters (e.g. kanji), since MINIX uses only one byte characters, this option is equivalent to -c. For the same reason, the option -n has no effect and is not listed in this man- ual page. SEE ALSO
sed(1), awk(9). CUT(1)
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