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What does this command actually do "grep"Net mass flux" $1 |awk '{print $3}' > timeList.dat" ?

Greetings Shridhar,

A bit of context would be nice... anyway, that command line is split in two parts:

1. grep searches for the lines that have "Net mass flux".
2. The output from grep gets piped through "|" and sent to awk for processing; awk prints out the 3rd value it picks up on each of those lines, if I'm not mistaken.

To learn more about grep and awk:
Searching online for tutorials for each command will also get you more information. I also suggest tutorials about bash, so you can understand the first "$1" ;)

Best regards,
Bruno