Return code 127 when waiting for process id

Question

I am currently running an Ab Initio command from a ksh script. The process is giving me a return code of 127..

air sandbox run ${PSET_FILE_PATH} -SOURCE_DATA_DT ${LAST_DATE_CURR_MON} -AI_LOG_FILE ${LOG_FILE} >> ${LOG_FILE} 2>&1 &
    process_id=${$}
    sleep 60
    ps -e -oruser=UID -opid,ppid,vsz,args=CMD | grep "${USER}" | grep -v grep | grep -v 'ps '  > ${ENV_BASE}/cems/recovery/hltcheck/${USER}_startup_mem.txt
    wait ${process_id}
    RC=${?}
    [[ ${RC} -eq 0 ]] || End ERROR "Pset execution of creating mfs failed"

There are lots of processes here. Which one produces the 127 return code (which, incidentally, is the return code used by the shell to indicate a command could not be found). — chepner, Mar 01 '17 at 15:55
Dear Brian, in many cases braces are not required and you can save typing and improve readibility; you can use for example `$PSET_FILE_PATH` and `RC=$?` (and others) directly. — linuxfan says Reinstate Monica, Mar 02 '17 at 09:27

score 2 · Answer 1 · answered Mar 02 '17 at 01:58

The script is not doing what I think you want it to do.

The return code "127" is because the wait ${process_id} command returns it since the process id received as argument is not a background process.
The process id to wait for is not correct because the command process_id=${$} receives the PID of the current shell script instance. The correct thing would be to use process_id=$! which will assign the PID of the last process put in background.

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Return code 127 when waiting for process id

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