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Full Discussion: Remove 5th character from Field1 & Print
Top Forums Shell Programming and Scripting Remove 5th character from Field1 & Print Post 302151255 by bakunin on Friday 14th of December 2007 04:57:10 AM
Old 12-14-2007
Quote:
Originally Posted by abdulaziz
any explanation of thoese sed commands
The base of the all is to match the first four characters in a line (the four dots) and put tem into a variable (the surrounding escaped brackets), then match the 6th and all following characters and put them into a variable too - in other words, match the complete line except the fifth character. I have marked the first, second and third part of the regexp with 1, 2 and 3 for you. In the output you skip part 2:

Code:
sed 's/^\(....\).\(.*\)$/\1\2/'
        111111112333333

The other sed-statement is just a variation on that. You can "multiply" regular expressions: The asterisk is such a "multiplier", it will create a copy of the previous regular expression as often as it is needed to match. The construction with the curly brackets is less vague: you can control the exact number of repetitions or even a range of repetitions. The following regexp parts are examples of this:

Code:
/..../    /.\{4\}/  -> four times the preceding "."

/.*/                -> matches 0 or more instances of "."
/.\{4,5\}/          -> matches 4 or 5 instances of "."

bakunin
 

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LEARN ABOUT DEBIAN

hotswaprc

HOTSWAPRC(5)							File Formats Manual						      HOTSWAPRC(5)

NAME

       hotswaprc - configuration file for  hotswap

DESCRIPTION

       /etc/hotswaprc is the global configuration file for the hotswap utility.

       It  allows system administrators to specify arbitrary shell scripts to be run after a device is inserted, as well as before and after it is
       removed. Scripts are selected according to the model name retrieved from the device. This is particularly helpful for automatic	configura-
       tion of CD-RW drives, which require SCSI emulation and bypass normal access via the IDE subsystem.

       hotswaprc  is  implemented  as  an  Extensible Mark-up Language (XML) application.  XML documents are structured using elements of the form
       <tag-name> content <tag-name>. A Document Type Definition (DTD) describes the possible content of each element.

       Please refer to the XML specification for more information. The hotswap distribution also contains an example file,  doc/hotswaprc.example,
       which includes the DTD for the configuration file format.

ELEMENTS

       <hotswap>
	      This is the root element of the document. Each valid hotswaprc must contain exactly one <hotswap> element. The <hotswap> element may
	      contain an arbitrary number of <device> elements.

       <device>
	      The configuration file contains one <device> element for every device for which scripts are defined. The <device>  element  is  com-
	      posed of the following elements in this order: <name>, <post-insert>, <pre-remove>, <post-remove>. All but <name> are optional.

       <name> The content of this element is the model identification string of the IDE device the current <device> element refers to.

       <post-insert>
	      Contains the shell script that is to be executed after the device has been inserted and registered with the kernel.

       <pre-remove>
	      Contains the shell script that is to be run before hotswap attempts to unregister the device.

       <post-remove>
	      Contains the shell script that is to be run after the device had been unregistered.

REPORT BUGS

       Report bugs to t.stadelmann1@physics.ox.ac.uk.

AUTHOR

       Written by Tim Stadelmann.

SEE ALSO

       hotswap(1), xhotswap(1).

COPYRIGHT

       Copyright (c) 2002-2003 Tim Stadelmann.

       Permission is granted to copy, distribute and/or modify this document under the terms of the GNU General Public License (GPL), Version 2 or
       any later version published by the Free Software Foundation.

								26th November 2002						      HOTSWAPRC(5)
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