Chances are you can wait for that BG program, as it is in then same job tree/group as your main script. Run ps, grep for the (expanded) BIP $PROCNAME 3 process, and wait for its PID.
Chances are you can wait for that BG program, as it is in then same job tree/group as your main script. Run ps, grep for the (expanded) BIP $PROCNAME 3 process, and wait for its PID.
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.
Last edited by Don Cragun; 06-20-2013 at 01:37 AM..
Reason: fixed case: bip -> BIP.
This User Gave Thanks to Don Cragun For This Post:
since bip.sh output is redirected to a file on your main script, you may check if any process has this file open to ensure that the file is written. If no process has it open, the next command ( tail) can be started..
@Don Cragun: Right, I should have known better / read the man.
Still you could find the PID using ps, and then check for the existence of your BIP process. Or, have bip.sh report that PID back.
@Don Cragun: Right, I should have known better / read the man.
Still you could find the PID using ps, and then check for the existence of your BIP process. Or, have bip.sh report that PID back.
Yes, bip.sh could report the PID back to the caller, but the caller still can't use the wait utility to wait for it to terminate. The caller could repeatedly search ps command output to determine when the grandchild has terminated. But an invocation of wait with the PID of the grandchild as an operand will yield an exit code of 127 from wait indicating that the grandchild is not known to the current shell (i.e., the underlying waitpid() call generated an ECHILD error).
well...i go into a loop and check if a process named a.sh is still going on..if its still running, i wait for two seconds and again check as the same function is being called within itself...ps gives you the list of processes running and grep displays from the standard output the process named a.sh..if there is no process running, it will start the second process and so on...u can google a bit for the other contents used in the script. just let me know if it helped
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06-20-2013
