10-02-2007
Hello,
This is not homework or school work. I'm a seasoned C++ developer on windows. My current project is both, windows and unix based. As part of my expanding job duties, I'm getting my feet wet in the unix world as well.
My problem is that I have a very large file called ColCheckMe which is tab-delimited, that I have to process. Each line in ColCheckMe has 7 columns, and the values in the 5th column are integers. Using shell functions (and standard LINUX/UNIX filters), I have to verify that these conditions are satisfied in ColCheckMe. In the same file, each value in column 1 is unique. How do I verify that? I have to write a shell function that counts the number of occurrences of the word “SpecStr” in the file ColCheckMe.
Thanks for any help.
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LEARN ABOUT FREEBSD
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