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Full Discussion: Compare value of a column in a file
Top Forums Shell Programming and Scripting Compare value of a column in a file Post 302851453 by Don Cragun on Monday 9th of September 2013 03:33:23 AM
Old 09-09-2013
Quote:
Originally Posted by Vivekit82
The input file has 1000 records of similar pattern as the sample input file that I have given.

However in the script you are hard coding the input values as below
print $4,$5,$7,$9}' OFS=, input
value 4h,value 5h,Value 7h,1
value 4c,value 5c,Value 7c,1

I think there should be some loop which take the values from input .csv file and then redirect the output based on search critaria(where column 9 has value 1) to some output file.
No! The script neutronscott gave you was:
Code:
awk -F, '$9==1{print $4,$5,$7,$9}' OFS=, input

which specifies that the input field separator is comma (-F,), the output field separator is comma (OFS=,), and for every line in your input file (you didn't say what the name was, but this code assumes that the input file is named input) if the ninth field is 1 ($9==1) it will print the 4th, 5th, 7th, and 9th fields (print $4,$5,$7,$9). Then he showed that with the input you supplied, it produces the output:
Code:
value 4h,value 5h,Value 7h,1
value 4c,value 5c,Value 7c,1

which is exactly what you asked for. If you have a different name for your input file change input in the script to the name of your input file. If you want to save the output in a file, add
Code:
 > your_desired_output_filename

to the end of the awk command.

This command wil work just fine with zero lines of input or as many input lines as are present in any csv file you give it (as long as you have space to store the output in the file to which you redirect output and input lines are no longer than LINE_MAX bytes for whatever value LINE_MAX is on your system).
 

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LEARN ABOUT LINUX

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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