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Full Discussion: Masking algorithm
Top Forums Shell Programming and Scripting Masking algorithm Post 302951053 by Don Cragun on Friday 31st of July 2015 09:33:30 PM
Old 07-31-2015
Is this a homework assignment. Homework assignments must be filed in the Homework & Coursework forum and the 1st post in threads in that forum must contain a completely filled out homework template.

If it isn't homework, you need to make your requirements much clearer. A masking operation would blank out or remove a specific character or a specific set of characters; not replace one set of characters with another set of characters.

And without sample input and corresponding sample output (in CODE tags), your specification is ambiguous. If an A is found and converted to a B (as in your sample), is the output for that position supposed to be aB or should it be a C because the 2nd line in your sample input file says B should be changed to C?
 

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JIGDO-LITE(1)															     JIGDO-LITE(1)

NAME
jigdo-lite - Download jigdo files using wget SYNOPSIS
jigdo-lite [ URL ] DESCRIPTION
See jigdo-file(1) for an introduction to Jigsaw Download. Given the URL of a `.jigdo' file, jigdo-lite downloads the large file (e.g. a CD image) that has been made available through that URL. wget(1) is used to download the necessary pieces of administrative data (contained in the `.jigdo' file and a corresponding `.template' file) as well as the many pieces that the large file is made from. The jigdo-file(1) utility is used to reconstruct the large file from the pieces. `.jigdo' files that contain references to Debian mirrors are treated specially: When such a file is recognized, you are asked to select one mirror out of a list of all Debian mirrors. If URL is not given on the command line, the script prompts for a location to download the `.jigdo' file from. The following command line options are recognized: -h --help Output short summary of command syntax. -v --version Output version number. --scan FILES Do not ask for "Files to scan", use this path. --noask Do not ask any questions, instead behave as if the user had pressed Return at all prompts. This can be useful when running jigdo- lite from cron jobs or in other non-interactive environments. SEE ALSO
jigdo-file(1), jigdo-mirror(1), wget(1) (or `info wget') CD images for Debian Linux can be downloaded with jigdo <URL:http://www.debian.org/CD/jigdo-cd/>. AUTHOR
Jigsaw Download <URL:http://atterer.net/jigdo/> was written by Richard Atterer <jigdo atterer.net>, to make downloading of CD ROM images for the Debian Linux distribution more convenient. 19 May 2006 JIGDO-LITE(1)
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