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Top Forums Shell Programming and Scripting sed: remove first character from particular line Post 302317502 by hkansal on Tuesday 19th of May 2009 07:04:23 AM
Old 05-19-2009
sed: remove first character from particular line

Hello Experts,

I have a file "tt.txt" which is like:
Code:
#a1=a2
b1=b2
#c1=c2

I need to remove the pound (#) sign from a particular line. In this case let us assume it's 3rd line : "#c1=c2"

I can do it through:
Code:
sed "s/#c1=c2/c1=c2/" tt.txt

but it is possible that I may not know the value "c2" due to which I would not be able to use the above command.

Please point me in the right direction.

Thank You.

Regards,
HKansal
 

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ARD-PARSE-BOARDS(1)					      General Commands Manual					       ARD-PARSE-BOARDS(1)

NAME
ard-parse-boards - Read data from the Arduino boards.txt file USAGE
Dump all the data in the file: $ ard-parse-boards --dump See which boards we know about: $ ard-parse-boards --boards Look for a particular board... $ ard-parse-boards --find uno multiple terms are implicitly ANDed: $ ard-parse-boards --find duemil 328 Dump all the data for a particular board: $ ard-parse-boards atmega328 Extract a particular field: $ ard-parse-boards atmega328 build.f_cpu DESCRIPTION
The Arduino software package ships with a boards.txt file which tells the Arduino IDE details about particular hardware. So when the user says he's got a shiny new Arduino Uno, boards.txt knows that it has a 16MHz ATmega328 on it. It would be nice to access these data from the command line too. In normal operation you simply specify the tag given to the board in the boards.txt file, and optionally a field name. This program then extracts the data to STDOUT. Most boards have names which are quite unwieldy, so we always refer to a board by a tag, not its name. Strictly the tag is the bit before the first dot in the boards.txt key. You can see a list of board tags and names with the "--boards" option. OPTIONS
--boards_txt=[file] Specify the full path to the boards.txt file. The following options all disable the normal 'lookup' operation. --dump Dump the complete database in YAML format. --boards Print a list of the tag and name of every board in the file. --find [query] <query> ... Find matching data. Strictly, return a list of values which match all of the query terms, treating each term as a case-insensitive regexp. For example: --find 328 List data containing 328 (anywhere in the value). --find due List data containing 'due' (e.g. duemilanove). --find 328 due List data containing both 328 and due. BUGS AND LIMITATIONS
There are no known bugs in this application. Please report problems to the author. Patches are welcome. AUTHOR
Martin Oldfield, ex-atelier@mjo.tc Thanks to Mark Sproul who suggested doing something like this to me ages ago. LICENSE AND COPYRIGHT
Copyright (c) 2011, Martin Oldfield. All rights reserved. This file is free software; you can redistribute it and/or modify it under the terms of the GNU Lesser General Public License as published by the Free Software Foundation; either version 2.1 of the License, or (at your option) any later version. This program is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY; without even the implied warranty of MER- CHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. MAY 2012 ARD-PARSE-BOARDS(1)
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