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Full Discussion: Masking algorithm
Top Forums Shell Programming and Scripting Masking algorithm Post 302951089 by n78298 on Sunday 2nd of August 2015 03:07:32 AM
Old 08-02-2015
This is not an assignment; this is a real time challenge. Apologies for not articulating problem in the correct manner and fully explaining the issue.
Maybe calling it a masking solution is not the right thing. My actual requirement is to replace a set of characters with another set of character. That too a character by character replacement so reverse decryption can be easily achieved as well.
As it’s character by character replacement every character will have one and only one replacement character. Hence ABCDE should convert to BCDEF where replacement algorithm is like
Code:
A : B
B : C
C : D
D : E
E : F

The first character to be found and replaced by second character.
 

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SYSTEMD-DEBUG-GENERATOR(8)				      systemd-debug-generator					SYSTEMD-DEBUG-GENERATOR(8)

NAME
systemd-debug-generator - Generator for enabling a runtime debug shell and masking specific units at boot SYNOPSIS
/lib/systemd/system-generators/systemd-debug-generator DESCRIPTION
systemd-debug-generator is a generator that reads the kernel command line and understands three options: If the systemd.mask= option is specified and followed by a unit name, this unit is masked for the runtime, similar to the effect of systemctl(1)'s mask command. This is useful to boot with certain units removed from the initial boot transaction for debugging system startup. May be specified more than once. If the systemd.wants= option is specified and followed by a unit name, a start job for this unit is added to the initial transaction. This is useful to start one or more additional units at boot. May be specified more than once. If the systemd.debug_shell option is specified, the debug shell service "debug-shell.service" is pulled into the boot transaction. It will spawn a debug shell on tty9 during early system startup. Note that the shell may also be turned on persistently by enabling it with systemctl(1)'s enable command. systemd-debug-generator implements systemd.generator(7). SEE ALSO
systemd(1), systemctl(1), kernel-command-line(7) systemd 237 SYSTEMD-DEBUG-GENERATOR(8)
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