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Full Discussion: BASH log file
Top Forums Shell Programming and Scripting BASH log file Post 302816145 by Don Cragun on Monday 3rd of June 2013 11:13:36 AM
Old 06-03-2013
Quote:
Originally Posted by Rahul619
... ... ...
---------- Post updated 06-03-13 at 05:23 AM ---------- Previous update was 06-02-13 at 08:39 AM ----------
Code:
#!/bin/bash
# NOTE: This script runs a.sh and b.sh at the same tiem and reports the exit
# status of both before terminating (if either one fails) or moving to to c.sh
# (if both succeed).
# Start a and b...
./bin/a.sh &
pida=$!         # save pid of a.sh
./bin/b.sh &
pidb=$!         # save pid of b.sh

# Reap a...
# NOTE: The following wait will not collect the exit status of b.sh even if
# it finishes first.
wait $pida
esa=$?          # save exit status of a.sh

# NOTE: Following line creates close.log rather than appending to it.  So,
# we get a clean log for each invocation of this script.
# NOTE: There is no need to redirect stderr from these echo commands; the
# only reason for echo to fail would be if there is an error writing to the
# log file (and redirecting that error message to a file that can't be written
# to means that we would get no notification of the error).
echo "a.sh job status : $esa" >close.log
if [ $esa -eq 0 ]
then
        echo "a.sh is success at $(date)" >>close.log
else
        echo "a.sh failed at $(date)" >>close.log
fi

Don, from ur note its clear that wait $pida will not collect the status of b.sh.. can u pls tell me whether wait $pida will interupt the background execution of b.sh which was started in parallel with a.sh ??

thanks a lot in advance !!
Neither the command wait $pida nor the later command wait $pidb have any effect on the execution of a.sh nor b.sh. They merely cause this script to suspend until a.sh and b.sh, respectively, terminate (if they haven't already terminated).

Furthermore, any subsequent attempts to wait for $pida or $pidb will fail. Once the status of a terminated child has been reaped, the child no longer exists; so an attempt to wait for it again will yield an ECHILD error resulting in the wait utility returning exit code 127.
 

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LEARN ABOUT V7

wait

WAIT(2) 							System Calls Manual							   WAIT(2)

NAME

       wait - wait for process to terminate

SYNOPSIS

       wait(status)
       int *status;

       wait(0)

DESCRIPTION

       Wait  causes its caller to delay until a signal is received or one of its child processes terminates.  If any child has died since the last
       wait, return is immediate; if there are no children, return is immediate with the error bit set (resp. with a value of -1  returned).   The
       normal return yields the process ID of the terminated child.  In the case of several children several wait calls are needed to learn of all
       the deaths.

       If (int)status is nonzero, the high byte of the word pointed to receives the low byte of the argument of exit when  the	child  terminated.
       The  low  byte  receives the termination status of the process.	See signal(2) for a list of termination statuses (signals); 0 status indi-
       cates normal termination.  A special status (0177) is returned for a stopped process which has not terminated and can  be  restarted.   See
       ptrace(2).  If the 0200 bit of the termination status is set, a core image of the process was produced by the system.

       If the parent process terminates without waiting on its children, the initialization process (process ID = 1) inherits the children.

SEE ALSO

       exit(2), fork(2), signal(2)

DIAGNOSTICS

       Returns -1 if there are no children not previously waited for.

ASSEMBLER

       (wait = 7.)
       sys wait
       (process ID in r0)
       (status in r1)

       The high byte of the status is the low byte of r0 in the child at termination.

																	   WAIT(2)
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