background processing in BASH Post: 302311684

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Operating Systems Linux background processing in BASH Post 302311684 by jville on Wednesday 29th of April 2009 09:58:46 AM

04-29-2009

Registered User

here is the o/p after I added set -x

+ ./child1
+ ./child2
+ set +b
+ trap test USR1
+ sleep 1
+ disown 24540
+ wait
in child process 1 child1
in child process 4 child2
in child process 5 child2
in child process 6 child2
+ kill -USR1 24534
++ test
++ jobs -n
++ sed -n '/ Done / s/^\[$[0-9]*$\].*/\1/p'
+ DONE=
+ '[' -n '' ']'
+ sleep 1
+ disown 25575
+ wait
in child process 2 child1
+ kill -USR1 24534
++ test
++ jobs -n
++ sed -n '/ Done / s/^\[$[0-9]*$\].*/\1/p'
+ DONE=
+ '[' -n '' ']'
+ sleep 1
+ disown 26616
+ wait
+ kill -USR1 24534
++ test
++ jobs -n
++ sed -n '/ Done / s/^\[$[0-9]*$\].*/\1/p'
+ DONE=
+ '[' -n '' ']'
+ sleep 1
+ disown 27658
+ wait
in child process 3 child1
+ kill -USR1 24534
++ test
++ jobs -n
++ sed -n '/ Done / s/^\[$[0-9]*$\].*/\1/p'
+ DONE=
+ '[' -n '' ']'
+ sleep 1
+ disown 28694
+ wait
+ kill -USR1 24534
++ test
++ jobs -n
++ sed -n '/ Done / s/^\[$[0-9]*$\].*/\1/p'
+ DONE=
+ '[' -n '' ']'
+ sleep 1
+ disown 29744
+ wait
+ kill -USR1 24534
++ test
++ sed -n '/ Done / s/^\[$[0-9]*$\].*/\1/p'
++ jobs -n
+ DONE=
+ '[' -n '' ']'
+ sleep 1
+ disown 30772
+ wait
+ kill -USR1 24534
++ test
++ jobs -n
++ sed -n '/ Done / s/^\[$[0-9]*$\].*/\1/p'
+ DONE=
+ '[' -n '' ']'
+ disown 31808
+ wait
+ sleep 1
+ kill -USR1 24534
++ test
++ jobs -n
++ sed -n '/ Done / s/^\[$[0-9]*$\].*/\1/p'
+ DONE=
+ '[' -n '' ']'
+ sleep 1
+ disown 371
+ wait
+ kill -USR1 24534
++ test
++ jobs -n
++ sed -n '/ Done / s/^\[$[0-9]*$\].*/\1/p'
+ DONE=
+ '[' -n '' ']'
+ sleep 1
+ disown 1486
+ wait
+ kill -USR1 24534
++ test
++ sed -n '/ Done / s/^\[$[0-9]*$\].*/\1/p'
++ jobs -n
+ DONE=
+ '[' -n '' ']'
+ sleep 1
+ disown 2516
+ wait

$ + kill -USR1 24534
./p2: line 26: kill: (24534) - No such process

jville

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LEARN ABOUT OPENSOLARIS

disown

disown(1)							   User Commands							 disown(1)

NAME

       disown - ksh93 built-in function to disassociate a job with the current shell

SYNOPSIS

       disown [job ...]

DESCRIPTION

       The  ksh93  disown command prevents the current shell from sending a HUP signal to each of the specified jobs when the current shell termi-
       nates a login session.

       If job is omitted, disown sends the HUP signal to the most recently started or stopped background job.

OPERANDS

       The following operands are supported:

       job    Specifies the job or jobs on which disown operates.

	      Specify job as one of the following:

	      number	  Refers to a process ID.

	      -number	  Refers to a process group ID.

	      %number	  Refers to a job number.

	      %string	  Refers to a job whose name begins with string.

	      %?string	  Refers to a job whose name contains string.

	      %+ or %%	  Refers to the current job.

	      %-	  Refers to the previous job.

EXIT STATUS

       0     Successful completion.

       >0    One or more specified jobs does not exist.

EXAMPLES

       Example 1 Disowning a Job

       The following example disowns job 1:

	 example% disown %1

AUTHORS

       David Korn, dgk@research.att.com

ATTRIBUTES

       See attributes(5) for descriptions of the following attributes:

       +-----------------------------+-----------------------------+
       |      ATTRIBUTE TYPE	     |	    ATTRIBUTE VALUE	   |
       +-----------------------------+-----------------------------+
       |Availability		     |SUNWcsu			   |
       +-----------------------------+-----------------------------+
       |Interface Stability	     |Uncommitted		   |
       +-----------------------------+-----------------------------+

SEE ALSO

       bg(1), jobs(1), ksh93(1), wait(1), attributes(5)

SunOS 5.11							    18 Apr 2007 							 disown(1)

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