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If you have GNU Parallel GNU Parallel - GNU Project - Free Software Foundation (http://www.gnu.org/software/parallel/) installed you can do this:
parallel '{} >{.}.out' ::: sample*.shor:
seq 4 |...

For best performance it is important that the data is not written back to disk. So it is a goal to get everything done in RAM.

cat testfile | parallel --pipe --block 10M 'sort | uniq -c' | perl...

To do it in parallel install GNU Parallel:
find . -type f -name "execute_command.sh" | parallel
Watch the intro video to learn more: Part 1: GNU Parallel script processing and execution - YouTube...

If you cannot accept that a few lines will be mixed together then you need to avoid race conditions like:
mkfifo fifo
(echo program1_line1; sleep 2; echo program1_line2) >fifo &
(echo...

This is probably what you are looking for:

parallel -j0 mv {} {.} ::: *.xml.dat
parallel -j0 echo {} -\\\> {.}\;mv {} {.} ::: *.xml.dat

GNU Parallel makes it often easy to generate command lines:
parallel "echo {}; cut -f5 {} | sort -k1.3n | uniq | wc -l" ::: *.rod
It will also run the jobs in parallel. If you jobs are...

GNU Parallel (http://www.gnu.org/software/parallel/) is your friend:

cat syslogs | nawk '/From/ { print $3 }' | uniq | parallel "grep {} syslogs >> {}"

This even does the grepping in parallel,...