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Full Discussion: shell scripting
Top Forums Shell Programming and Scripting shell scripting Post 302675037 by Pavan Ganesh on Saturday 21st of July 2012 09:45:30 AM
Old 07-21-2012
I have multiple text files (tab delimited) - all with four columns - id, name, salary and department.

Column order in each txt file is not guarenteed.

I need to write a Korn shell script which takes one of the file name as input and returns id and department columns as output.

I am not sure about how to return those two specific columns considering that the order of those two columns is not same for the input file that gets passed and so I am assuming I cannot use fixed ordinal position (like $1 or $3..). Is there a way I can read the data from file based on column names instead of ordinal positions (my input text file can contain column headers).

Any help in this regard would be greatly appreciated. Thanks!
 

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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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