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Written by Oleksandr Gavenko (AKA gavenkoa), compiled on 2017-01-30 from rev ccaa2f364422+.

Shell.

Quoting.

http://www.mpi-inf.mpg.de/~uwe/lehre/unixffb/quoting-guide.html
A Guide to Unix Shell Quoting

Portability.

http://code.dogmap.org/lintsh/
lintsh is a Bourne shell that optionally warns about suspicious or nonportable constructs
http://www.gnu.org/software/autoconf/manual/html_node/Portable-Shell.html
Portable Shell Programming

Kill processes after timeout.

$ yes xxx& p1=$! ; yes ===& p2=$! ; sleep 2; kill $p1; kill $p2