Get nth occurence of string from a file Post: 302940896

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Top Forums Shell Programming and Scripting Get nth occurence of string from a file Post 302940896 by Corona688 on Thursday 9th of April 2015 05:30:43 PM

04-09-2015

Registered User

Please use code tags for all code, data, and output.

awk is a powerful language for this sort of thing, you can match strings like grep, but you can also count the number of lines and columns, tell it how columns are separated, count things and use variables. You'll find it on any UNIX or UNIX-like system.

Code:

$ awk -F"," -v X="03" -v N=2 '($1 == X) && ((++L)>=(N+0)) { print $2 ; exit }' inputfile

test2

$

-F"," tells it to consider , as column splitters.

-v X="03" and -v N=2 preset the X and N variables inside awk. awk has its own variables independent of the shell's.

($1 == X) && ((++L) ==(N+0)) { ... } means "run the following code when the first column equals the variable X, and L is equal to N". $ means column in awk, not variable. $1 would be 01, $2 would be 0000000, etc. "++L" adds one to L every time ($1 == X) is true.

I did (N+0) to make sure awk used N as a number, not a string.

{ print $2 ; exit } means "print the second column, then stop reading this file".

So, a combined grep, wc, and cut.

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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