>Number:         7351
>Category:       bin
>Synopsis:       ksh problem if last command of pipe is a shell built-in
>Confidential:   no
>Severity:       serious
>Priority:       high
>Responsible:    bin-bug-people (Utility Bug People)
>State:          open
>Class:          sw-bug
>Submitter-Id:   net
>Arrival-Date:   Fri Apr  9 19:35:01 1999
>Last-Modified:
>Originator:     C Kane
>Organization:
>Release:        NetBSD/i386 1.4_ALPHA 990408
>Environment:
System: NetBSD ckane5 1.4_ALPHA NetBSD 1.4_ALPHA (ckane4) #17: Thu Apr 1 23:10:16 PST 1999 root@ckane5:/usr/netbsd-current/src/sys/arch/i386/compile/ckane4 i386


>Description:
	ksh appears to run the last component of a pipeline in a
	child process which causes problems if setting envariables.

>How-To-Repeat:
	This example:
	  echo test | read a
	  echo $a
	should print "test" but prints a blank line.

	This example:
	  #!/bin/ksh
	  ps -ax | while read PID TT STAT TIME COMMAND ARGS
	  do
	    case $COMMAND in
	      syslogd  ) SYSLOGD=$PID ;;
	      portmap  ) PORTMAP=$PID ;;
	      update   ) UPDATE=$PID ;;
	    esac
	    echo syslogd=$SYSLOGD portmap=$PORTMAP update=$UPDATE
	  done
	  echo FINAL syslogd=$SYSLOGD portmap=$PORTMAP update=$UPDATE
	demonstrates that the loop is run in a subshell and when it
	exits, the envariables that were set are no longer set.

>Fix:
	Unknown
>Audit-Trail:
>Unformatted: