Array Variable being Assigned Values in Loop, But Gone when Loop Completes???
Hello All,
Maybe I'm Missing something here but I have NOOO idea what the heck is going on with this....?
I have a Variable that contains a PATTERN of what I'm considering "Illegal Characters". So what I'm doing is looping
through a string containing some of these "Illegal Characters". Now when these chars are found I add them to the Array
variable, and on the very next line (while still in the same if statement, inside the loop) I print the Array Element which
shows the correct value inside that particular element.
Now after the loop completes I'm trying to print the array with a 'for' loop and for some reason its treating the array as
if it were empty, and I have NO idea why this is happening...?
Here's the Section that isn't working correctly:
Below is the Output.
The Output from the "while" loop is CORRECT. But then after that "while" loop is done, then it's the "for" loop's turn and it
prints NOTHING...
Here's the Output:
As you can see in the Output, the 'while' the loop is looping through the string and it is printing the Illegal
Characters that it finds, and you can see that the variable inside the loop DOES contain the values...
So why is the array empty after the loop has completed?
Any thoughts would be much appreciated!
Thanks in Advance,
Matt
---------- Post updated at 04:45 PM ---------- Previous update was at 03:55 PM ----------
UPDATE:
Well this look like it has something to do with my "while" loop...
Maybe something like it's spawning a sub-process so when it returns from the sub-process that Array doesn't exist anymore?
If I put the text into a file and loop using this construct (below) instead of what I have now, the array contains the data
after it completes.
NEW LOOP CONSTRUCT:
How can I do this without printing to a file first?
Seems like too much work for something as simple as looping through a string character-by-character..?
The main shell forks off a copy of itself to run while read independently of the echo so they can both run while connected by a pipe. The copy, or "sub-shell", runs successfully, setting all your variables and such as you please, until the pipe runs out of information and returns EOF. Then the loop quits.
Then the subshell dies. Control is returned to the main shell, which remains unchanged. You set all your variables in the subshell, not the main one.
In short: It's the pipe that does it. Your shell and everything behind the pipe are different processes and don't share variables.
Pipes are overkill if you have substring operators anyway. This way of getting a single character ought to work identically in bash and ksh:
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