08-07-2016
Thank you Stomp. Now here is my understanding. Please correct me if wrong:
1. awk scans each row of the file.
2. It stores entire row in d[$1$4"_1" and column to compare in d[$1$4"_2"
3. After comparing it prints the row where column 6 value is greater.
Few more questions:
1. What is the purpose of substr(v,length(v))==1). Does this check for the value _1?
2. Does awk scan and store the entire file first and then starts comapring?
3. How does awk know that column 1 and column 4 need to be identical and compare value of column 6 between 1st and 2nd row or so on?
These questions may appear very naive. I am not very familiar with array in awk. Sorry to trouble you on this.
Thanks
Angsuman
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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