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As is often the case with a little bit of jiggery pokery there is a pseudo-back-door.
The storage device can be your friend although it will slow things down with the disk thrashing and huge...

As Ravinder has already said it is because of the pipeline. Basically in classical Bourne Shell (and its descendants, bash - Bourne Again Shell - among them) code like this:

process1 | process2
...

It's good to mention that there is a major difference between bash and ksh running the same code.
Which is expected due to ksh / bash difference in implementation.


# ./in_ksh.sh
Outside loop...

Hello Adarshreddy01,

IMHO that's because you are passing output of cat file1 command to while loop which is considered as a new shell(or in other language creates a sub shell to execute while...

Yes, the problem is not the loop but the pipe; things behind a pipe are executed in a separate subshell and don't modify variables in your original shell. Temporary files are actually a pretty good...