How does one wait for multiple background jobs to complete before continuing with a process?
For example, I want to get five files from the internet and then cat them together. In serial mode:
for i in 1 2 3 4 5; wget http://foo.com/path/to/file/file$i done cat file{1,2,3,4,5} > one big.file.txt
While the above works, it could be made faster if I could do the wgets in parallel, like so:
for i in 1 2 3 4 5; wget http://foo.com/path/to/file/file$i & done
However, I somehow have to wait at the end of the loop for the last job to finish before starting the cat. How can I do that? In pseudocode:
for i in 1 2 3 4 5; wget http://foo.com/path/to/file/file$i & done wait-for-last-job-to-finish cat file{1,2,3,4,5} > one big.file.txt
I'm experimenting with the wait command in bash. Will see how that goes.
Regards, - Robert http://www.cwelug.org/downloads Help others get OpenSource. Distribute FLOSS for Windows, Linux, *BSD, and MacOS X with BitTorrent
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