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Full Discussion: awk regular expression
Top Forums Shell Programming and Scripting awk regular expression Post 302785019 by @man on Sunday 24th of March 2013 10:11:37 AM
Old 03-24-2013
awk regular expression
Hello,

I have big files which I wanna filter them based on first column.

first column should be one of these strings: chr2L || chr2R || chr3L || chr3R || chr4 || chrX
and something like chr2Lh or chrY or chrM3L is not accepted.

I used the following command:
Code:
 awk '{ if ($1=="chr2L" || $1=="chr2R" || $1=="chr3L" || $1=="chr3R" || $1== "chr4" || $1=="chrX") print $0 }' input | sort -k1,1 -k2,2n > output

Is there easier way to do it? or is it true anyway?!!
And BTW, I wanna sort based on two column which the first is string and second is number and you see what I used in the code above. Please let me know if it's true also.

Thanks in advance.
 

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LEARN ABOUT DEBIAN

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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