06-03-2011
I do not think you need exec or full path for sh, and exec just saves a fork. What does -b do, put that value on the command line (hope it's a well behaved value)?
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FORK(3F) FORK(3F)
NAME
fork - create a copy of this process
SYNOPSIS
integer function fork()
DESCRIPTION
Fork creates a copy of the calling process. The only distinction between the 2 processes is that the value returned to one of them
(referred to as the `parent' process) will be the process id of the copy. The copy is usually referred to as the `child' process. The
value returned to the `child' process will be zero.
All logical units open for writing are flushed before the fork to avoid duplication of the contents of I/O buffers in the external file(s).
If the returned value is negative, it indicates an error and will be the negation of the system error code. See perror(3F).
A corresponding exec routine has not been provided because there is no satisfactory way to retain open logical units across the exec. How-
ever, the usual function of fork/exec can be performed using system(3F).
FILES
/usr/lib/libU77.a
SEE ALSO
fork(2), wait(3F), kill(3F), system(3F), perror(3F)
4.2 Berkeley Distribution May 27, 1986 FORK(3F)