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?
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.
I want to have a script that parses another script and does the job in another order.
I would not say this isn't possible, but extremely complex to parse any scripting language or shell. I wouldn't ever dare to start such a program even having 20+ years of experience in scripting.
You need to have the skill level of a compiler/interpreter developer. Definitively not a practical way to go.
An option i got to know of are snaphotting tools: Run some programm. Look what it did(changed files, permissions,...) and undo the effects made.
Besides: We're at unix.com here. I doubt that you find much ms windows expertise here.
and pipe the result into sh. Be aware that when "automating" things you should know exactly what you are doing , and do a test run before each "live" run...
I want to have a script that parses another script and does the job in another order.
I would not say this isn't possible, but extremely complex to parse any scripting language or shell. I wouldn't ever dare to start such a program even having 20+ years of experience in scripting.
You need to have the skill level of a compiler/interpreter developer. Definitively not a practical way to go.
Thats what I sadly figured, but asking is free of charge as they say
Quote:
Originally Posted by RudiC
It may be as simple as
Code:
awk '{print $1, $3, $2}' file
and pipe the result into sh. Be aware that when "automating" things you should know exactly what you are doing , and do a test run before each "live" run...
That looks interesting, sadly I'd have to run this via windows utitlites (awk might exist, but it isn't stock inventory).
The good news for my script is that the
"move" "parameter 1" "parameter2"
are certainly constant. Also they are all seperated by one " " space and each line is build that way.
If it was possible to move -one line at a time- and use these parameters" that way.. hmm..
Hi,
I am using a batch file to run 2 or more shutdown batch for each of my server like below:
Shutdown_serverA.bat
Shutdown_serverB.bat
...
Is there anyway i can do this in parallel instead of serially:confused:
ServerA & ServerB shutdown at the same time in one click (batch). (4 Replies)
Hi ,
I am trying to execute one script residing on server B from server A and in automated way but with a trigger.
My main quetion are
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Hi!
I'm a beginner at scripting, but have managed to complete a working KSH-script.. :D
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Hi,
I have a shell script to find files older than 'X' days ($2) in directory path ($1) and delete them.
Like this:
my_file_remover.sh /usr/home/c 90
Now, I need to modify this script and add it in CRON, so that it checks other directories also.
Like:
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Hi all,
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hi all,
I am a newbie in unix shell script. May I know how to write a bacth job to
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i.e.
inside input.txt
====
a.txt
b.txt
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I need to modify some existing scripts, but am having trouble finding information on windows scripting, a forum similar... (2 Replies)
09-07-2019
