Replace column help Post: 302980622

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Top Forums Shell Programming and Scripting Replace column help Post 302980622 by venky338 on Tuesday 30th of August 2016 09:04:12 PM

08-30-2016

Registered User

Quote:

Originally Posted by Don Cragun

Here is the script with comments:

Code:

awk '            # Start awk script...
BEGIN {    FS = OFS = "|" }# Before reading any lines from the input file, set the
            # input file field separator (FS) and the output file
            # field separator (OFS) to the pipe symbol.
NR > 1 {$3 = 0 }    # For every line where the input file line number (NR)
            # is greater than 1 (i.e., skip the header line) set
            # field #3 to zero.
1            # For every line in the input file, perform the default
            # action (print the current input line possibly modified
            # by the above actions).
' file            # End the awk script and name the input file to be
            # processed.

Let us know if you still have questions.

Note also that the last line of the sample input you provided:

Code:

order_id|line_id|retail|cost
2324|1|99.99|50
89793|23|100|23.99
90989|9|23|76.50|56.5

has five fields (not four) and the output this script produces:

Code:

order_id|line_id|retail|cost
2324|1|0|50
89793|23|0|23.99
90989|9|0|76.50|56.5

has the 3rd field in this line set to zero; not the 4th field you said you wanted:

Code:

order_id|line_id|retail|cost
2324|1|0|50
89793|23|0|23.99
90989|9|23|0|56.5

If what you wanted was to set the next to the last field to zero instead of the 3rd field to zero, that could be done with:

Code:

awk '            # Start awk script...
BEGIN {    FS = OFS = "|" }# Before reading any lines from the input file, set the
            # input file field separator (FS) and the output file
            # field separator (OFS) to the pipe symbol.
NR > 1 {$(NF-1) = 0 }    # For every line where the input file line number (NR)
            # is greater than 1 (i.e., skip the header line) set
            # field the next to the last field (field number NF - 1)
            # to zero.
1            # For every line in the input file, perform the default
            # action (print the current input line possibly modified
            # by the above actions).
' file            # End the awk script and name the input file to be
            # processed.

but that is not what your English description of the problem requested.

Thanks for the detailed response Don. It was a typo on the input file. There should have been only four columns. Thanks again

venky338

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