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Top Forums UNIX for Beginners Questions & Answers Reverse prior batch job (without simply rewriting the script) Post 303038502 by stomp on Wednesday 4th of September 2019 05:58:51 PM
Old 09-04-2019
It may be not that simple, to reverse a script.

For example, if you have a file consisting of a and b characters. Your normal script replaces a with b. How do you reverse that? It's not possible to know original a's had been.

That maybe possible or impossible depending on the specific task. But there's hardly a generic way to do this.

If the task is about manipulating files you may take a backup before the task via cp, tar, rsync, ... and reset the state to that backup when needed.

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

And of course: What's your OS environment and programming language/shell?

Last edited by stomp; 09-05-2019 at 03:09 AM..
 

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REVERSE(3)						       MBK UTILITY FUNCTIONS							REVERSE(3)

NAME
reverse - reverse a list of chained elements ORIGIN
This software belongs to the ALLIANCE CAD SYSTEM developed by the ASIM team at LIP6 laboratory of Universite Pierre et Marie CURIE, in Paris, France. Web : http://asim.lip6.fr/recherche/alliance/ E-mail : alliance-users@asim.lip6.fr SYNOPSYS
#include "mut.h" chain_list *reverse(ptold) chain_list *ptold; PARAMETER
ptold Pointer to a chain_list to be reversed DESCRIPTION
The reverse function allows to reverse the order of the elements of a chain_list. It means that the last element becomes the first one, the one before the last one the second one, and so on. remark : all mbk structures have for first field the NEXT field, so, with appropriate cast, one can reverse any mbk list. Let's notice that nothing in the C language description demands a structure to be defined in memory the same way its members are defined in C. But all compiler do it this way now a day. Let's hope it will continue! RETURN VALUE
reverse returns a pointer to the head of the reversed list. EXAMPLE
#include "mut.h" void reverse_con(p) lofig_list *p; { p->LOCON = (locon_list *)reverse((chain_list *)p->LOCON); } SEE ALSO
mbk(1), chain(3). BUG REPORT
This tool is under development at the ASIM department of the LIP6 laboratory. We need your feedback to improve documentation and tools. ASIM
/LIP6 October 1, 1997 REVERSE(3)
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