This shouldn't work. You can only "wait" for your children; not your grandchildren or siblings. Since the last thing bip.sh does before exiting is invoke BIP asynchronously, bip.sh returns just after BIP has been started without waiting for it to finish and leaving the process that invoked bip.sh with no way to reap the grandchild's exit status and no direct way to wait for the grandchild to finish.

The obvious fix here is to remove the & at the end of the last line in bip.sh and invoke bip.sh with an & in cases where you want to continue other processing while BIP runs. The shell that invokes bip.sh can then wait for bip.sh to complete using a wait command without operands. But, of course, this may require modifying every other script that calls bip.sh and doesn't want to wait for it to finish.

Similarly, Just Ice's suggestion to use:

Code:

bip.sh && c.sh

won't work if the intent is to wait for the BIP command that was started by bip.sh to finish before starting c.sh because the current version of bip.sh returns without waiting for BIP to finish.