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Full Discussion: altering numbers in files
Top Forums Shell Programming and Scripting altering numbers in files Post 302178795 by era on Wednesday 26th of March 2008 10:28:39 AM
Old 03-26-2008
s/// is the substitution command you are familiar with from sed.

The regular expression \d+ is just a shorthand for [0-9]+ and putting it in parentheses "captures" it so you can refer back to it.

In the substitution part, we actually put a little Perl script, which subtracts one from the value we captured earlier (now referred to as $1).

The /g option says do this globally (really not necessary here).

The /e option is special to Perl, and says execute the substitution part, rather than just treat it as text.

Hope this helps.
 

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LEARN ABOUT FREEBSD

path_to_inst

path_to_inst(4) 						   File Formats 						   path_to_inst(4)

NAME

       path_to_inst - device instance number file

SYNOPSIS

       /etc/path_to_inst

DESCRIPTION

       /etc/path_to_inst records mappings of physical device names to instance numbers.

       The  instance  number  of  a  device  is  encoded in its minor number, and is the way that a device driver determines which of the possible
       devices that it may drive is referred to by a given special file.

       In order to keep instance numbers persistent across reboots, the system records them in /etc/path_to_inst.

       This file is read only at boot time, and is updated by add_drv(1M) and drvconfig(1M).

       Note that it is generally not necessary for the system administrator to change this file, as the system will maintain it.

       The system administrator can change the assignment of instance numbers by editing this file and doing a	reconfiguration  reboot.  However,
       any changes made in this file will be lost if add_drv(1M) or drvconfig(1M) is run before the system is rebooted.

       Each instance entry is a single line of the form:

       "physical name"	instance number "driver binding name"

       where

       physical name	       is the absolute physical pathname of a device. This pathname must be enclosed in double quotes.

       instance number	       is a decimal or hexadecimal number.

       driver binding name     is the name used to determine the driver for the device.
				This name may be a driver alias or a driver name.  The driver binding name must be enclosed in double quotes.

EXAMPLES

       Example 1: Sample path_to_inst Entries

       Here are some sample path_to_inst entries:

       "/iommu@f,e0000000" 0 "iommu"
       "/iommu@f,e0000000/sbus@f,e0001000" 0 "sbus"
       "/iommu@f,e0000000/sbus@f,e0001000/sbusmem@e,0" 14 "sbusmem"
       "/iommu@f,e0000000/sbus@f,e0001000/sbusmem@f,0" 15 "sbusmem"
       "/iommu@f,e0000000/sbus@f,e0001000/ledma@f,400010" 0 "ledma"
       "/obio/serial@0,100000" 0 "zs"
       "/SUNW,sx@f,80000000" 0 "SUNW,sx"

FILES

       /etc/path_to_inst

SEE ALSO

       add_drv(1M), boot(1M), drvconfig(1M), mknod(1M)

WARNINGS

       If  the	file  is  removed  the	system may not be bootable (as it may rely on information found in this file to find the root, usr or swap
       device).  If it does successfully boot, it will regenerate the file, but  after rebooting devices may end up having different minor numbers
       than they did before, and special files created via mknod(1M) may refer to different devices than expected.

       For the same reasons, changes should not be made to this file without careful consideration.

NOTES

       This  document  does  not  constitute  an  API.	 path_to_inst  may not exist or may have a different content or interpretation in a future
       release. The existence of this notice does not imply that any other documentation that lacks this notice constitutes an API.

SunOS 5.10							    2 Nov 1995							   path_to_inst(4)
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