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Full Discussion: exact string match ; search and print match
Top Forums Shell Programming and Scripting exact string match ; search and print match Post 302423815 by gaurav1086 on Saturday 22nd of May 2010 03:20:37 PM
Old 05-22-2010
Quote:
Originally Posted by bash_in_my_head
I am trying to match a pattern exactly in a shell script. I have tried two methods
Code:
awk '/\<mpath${CURR_MP}\>/{print $1 $2}' multipath

 perl -ne '/\bmpath${CURR_MP}\b/ and print' /var/tmp/multipath

Both these methods require that I use the escape character. I am guessing that is why
the variable ${CURR_MP} is not printing.

Does anyone know of a way I can search the file multipath for an exact string match and then print the match and the next field. $1 $2?

thanks
Try,

Code:
awk "/\<mpath${CURR_MP}\>/{print $1 $2}" multipath

I guess you want to expand the shell variable in your awk-one-liner. So use " " instead of ' ' . " " allows to interpret the shell variables before awk/perl has a go at it.

Hope this helps.
Regards,
Gaurav.
 

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LEARN ABOUT SUSE

multipath

MULTIPATH(8)						   Linux Administrator's Manual 					      MULTIPATH(8)

NAME

       multipath - Device mapper target autoconfig

SYNOPSIS

       multipath [-v verbosity] [-d] [-h|-l|-ll|-f|-t|-F] [-p failover|multibus|group_by_serial|group_by_prio|group_by_node_name] [device]

DESCRIPTION

       multipath is used to detect multiple paths to devices for fail-over or performance reasons and coalesces them

OPTIONS

       -v  level
	      verbosity, print all paths and multipaths

		   0	       no output

		   1	       print the created or updated multipath names only, for use to feed other tools like kpartx

		   2 +	       print all info : detected paths, coalesced paths (ie multipaths) and device maps

       -h     print usage text

       -d     dry run, do not create or update devmaps

       -l     show the current multipath topology from information fetched in sysfs and the device mapper

       -ll    show the current multipath topology from all available information (sysfs, the device mapper, path checkers ...)

       -f     flush a multipath device map specified as parameter, if unused

       -F     flush all unused multipath device maps

       -t     print internal hardware table to stdout

       -p policy
	      force maps to specified policy:

		   failover    1 path per priority group

		   multibus    all paths in 1 priority group

		   group_by_serial
			       1 priority group per serial

		   group_by_prio
			       1  priority group per priority value. Priorities are determined by callout programs specified as a global, per-con-
			       troller or per-multipath option in the configuration file

		   group_by_node_name
			       1 priority group per target node name. Target node names are fetched in /sys/class/fc_transport/target*/node_name.

       device update only the devmap the path pointed by device is in.	device is in the /dev/sdb (as shown by udev in the $DEVNAME  variable)	or
	      major:minor format.  device may alternatively be a multipath mapname

SEE ALSO

       multipathd(8), multipath.conf(5), kpartx(8), udev(8), dmsetup(8) hotplug(8)

AUTHORS

       multipath was developed by Christophe Varoqui, <christophe.varoqui@free.fr> and others.

								     July 2006							      MULTIPATH(8)
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