Reverse prior batch job (without simply rewriting the script) Post: 303038517

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Top Forums UNIX for Beginners Questions & Answers Reverse prior batch job (without simply rewriting the script) Post 303038517 by pasc on Thursday 5th of September 2019 05:07:49 AM

09-05-2019

Registered User

What are you about to do? Why do want to reverse an action?

Simple:

I want to have a second script that is not simply a "line by line reverse copy" of the first script,
but rather something that reads from the first.
=> So I don't have to have update two scripts.

Example:

Quote:

You have a program a that outputs folders in the following order:
11111112a
111111123b
111111124c
and these folders cannot be read by program b
That program requires the names to be:

aaaaaaaab1
aaaaaaaabc2
aaaaaaaabd3

You write a script that does:
move 11111112a aaaaaaaab1
...

so it will work with program b.
However then program a (that originally outputted the data)
can nolonger access the data.

=> You'd have to maintain "move filenames to program-b.bat" and "move-filenames-to-program-a.bat"
A real hassle, cause you have to update both scripts with each new entry, and if you forget just a single line along the way the corresponding script is worthless until you go error hunting.

TL;DR:
I want to have a script that parses another script and does the job in another order.

pasc

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LEARN ABOUT LINUX

service

service(8)						      System Manager's Manual							service(8)

NAME

       service - run a System V init script

SYNOPSIS

       service SCRIPT COMMAND [OPTIONS]

       service --status-all

       service --help | -h | --version

DESCRIPTION

       service runs a System V init script in as predictable environment as possible, removing most environment variables and with current working
       directory set to /.

       The SCRIPT parameter specifies a System V init script, located in /etc/init.d/SCRIPT.  The  supported  values  of  COMMAND  depend  on  the
       invoked	script,  service  passes  COMMAND and OPTIONS it to the init script unmodified.  All scripts should support at least the start and
       stop commands.  As a special case, if COMMAND is --full-restart, the script is run twice, first with the stop command, then with the  start
       command.

       service --status-all runs all init scripts, in alphabetical order, with the status command.

EXIT CODES

       service calls the init script and returns the status returned by it.

FILES

       /etc/init.d
	      The directory containing System V init scripts.

ENVIRONMENT

       LANG, TERM
	      The only environment variables passed to the init scripts.

SEE ALSO

       /etc/init.d/skeleton,
       update-rc.d(8),
       init(8),
       invoke-rc.d(8).

								     Jan 2006								service(8)