> Your fetch_cmd basically is a reimplementation of backticks.
Yes. But besides handling stderr it gives you another layer of indirection. And as the saying goes: there is not problem you cannot address with another layer of indirection ;-) Here it might actually be useful for logging the call (if it's generated) or storing the output for later inspection (it may not look as expected) or discard stderr or...

In reply to Re^2: capturing command output by pklausner
in thread capturing command output by morgon

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