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Full Discussion: Need to remove columns from file at run time
Top Forums Shell Programming and Scripting Need to remove columns from file at run time Post 302957790 by Amit Joshi on Thursday 15th of October 2015 03:31:38 AM
Old 10-15-2015
Need to remove columns from file at run time
I want to built a generic code to remove columns from file. Column number will be passed at run time.I may have multiple number like 2,5,10 so Can you please help.

I know how to remove when we know column number but I want a generic code where column number will be passed at run time.

Example:
Code:
cat test1
1,Amit
2,Ajay
3,AJ
 
cat > test2
11,aa,22,ss
12,ss,23,ff

Delete 2nd column from test1 then out put should be:
Code:
1
2
3

Delete 2nd and 4th column from test2 then out put should be
Code:
11,22
12,23

the above should be done with same code

Thanks in advance.
Last edited by Amit Joshi; 10-15-2015 at 05:48 AM.. Reason: added example
 

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LEARN ABOUT OSX

colrm

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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