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Full Discussion: setting variable value to dynamic sed match - escaping hell
Top Forums Shell Programming and Scripting setting variable value to dynamic sed match - escaping hell Post 302468946 by methyl on Thursday 4th of November 2010 09:03:22 AM
Old 11-04-2010
Just for interest, we can do this without "eval".
Code:
VAR_MATCH=$(set | grep \^"${VAR_NAME}=${VAR_REGEXP}")

We must not have a "^" at the start of $2 for this to work.
 

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LEARN ABOUT DEBIAN

aoe-mkdevs

aoe-mkdevs(8)						      System Manager's Manual						     aoe-mkdevs(8)

NAME

       aoe-mkdevs - create special device files for aoe driver

SYNOPSIS

       aoe-mkdevs {device-dir}
       env n_partitions=1 aoe-mkdevs {device-dir}

DESCRIPTION

       The aoe-mkdevs command is deprecated in favor of udev.  Systems with udev do not need to use the aoe-mkdevs or aoe-mkself commands, because
       udev will create device nodes as needed.

       Systems without udev use aoe-mkdevs to create the character special files necessary to control the aoe driver.  The aoe-mkdevs command uses
       aoe-mkshelf to also create block special files.

       The aoe drivers after version 49 support dynamic minor device numbers so that a greater number of devices can be supported.  The aoe-mkdevs
       command is incompatible with dynamic device numbers.  If your system lacks udev, and you are using an aoe driver version 50 or  above,  use
       the aoe_dyndevs=0 module option to force the aoe driver to use static device numbers.

       If  you	are  not  using  dynamic device numbers, and you built your aoe driver to support only one partition per device (whole-disk parti-
       tions), then the device files must match, and you should use the n_partitions environment variable described below.

   Arguments
       device-dir
	      This should be the name of the directory where the special device files will be created.

ENVIRONMENT VARIABLES

       If the n_partitions variable is set in the environment, it will override the default number of partitions per aoe disk, namely 16.

EXAMPLE

       In this example, the root user on a host named nai creates special files for using the aoe disks in shelf 7.  After  remembering  that  the
       driver  doesn't have partition support, this sysadmin gets rid of the mismatching device nodes and calls aoe-mkdevs again with n_partitions
       set to 1.

	      nai:~# rm -rf /dev/etherd
	      nai:~# aoe-mkdevs /dev/etherd
	      nai:~# ls /dev/etherd | wc -l
	      1603
	      nai:~# rm -rf /dev/etherd
	      nai:~# n_partitions=1 aoe-mkdevs /dev/etherd
	      nai:~# ls /dev/etherd | wc -l
	      103

SEE ALSO

       aoe-discover(8), aoe-interfaces(8), aoe-mkshelf(8), aoe-stat(8), aoetools(8), udev(7).

AUTHOR

       Ed L. Cashin (ecashin@coraid.com)

																     aoe-mkdevs(8)
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