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Basically I am using back tick operator due to which multiple instance of gzip get triggered as the thread is not waiting for the shell to return.

Backticks also block. (Unless you are deliberately backgrounding the command, in which case, don't do that!)

Post your failing code and you'll get help.

With the rise and rise of 'Social' network sites: 'Computers are making people easier to use everyday'

Examine what is said, not who speaks -- Silence betokens consent -- Love the truth but pardon error.

"Science is about questioning the status quo. Questioning authority".

In the absence of evidence, opinion is indistinguishable from prejudice.

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