[PATCH] t*: avoid using pipes

Hi,
I'm Prathamesh Chavan. As a part of my micropraoject I have been working on
"Avoid pipes for git related commands in test suites". I tried sending the
patch, but it got blocked since the mail contained more than 100 000
characters.
Hence, I have made the required changes in branch "micro-proj" and you may
find it in 'git' repository on my github account. My user name is: pratham-pc.
Please review the changes.

Thanks.