Getting Error count Post: 302909421

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Top Forums Shell Programming and Scripting Getting Error count Post 302909421 by Don Cragun on Wednesday 16th of July 2014 09:00:25 PM

07-16-2014

Registered User

What shell are you using? What OS are you using?

Your pseudo-code raise lots of ambiguities. You have ifs and thens, but no elses or fis.

count it as digit is not a valid shell command and doesn't seem to match the comments before your pseudo-code.

If you are using any POSIX conforming shell (such as ksh or bash), you could also try this alternative to what fpmurchpy suggested:

Code:

count=0
cp a/x.csv b/x.csv || count=$((count + 1))
cp a/d.csv b/f.csv || count=$((count + 1))
mv b/x.csv b/vin.csv || count=$((count + 1))
mv b/f.csv b/test.csv || count=$((count + 1))
exit $((count > 2))

As shown by fpmurphy, some of the arithmetic could be further simplified with a 1993 or later version of ksh or a recent version of bash. This code won't hide the diagnostics if some of the commands fail. (The code fpmurphy suggested will hide any diagnostics.)

It seems very strange to me to try to perform either of those mv commands if the corresponding cp command preceding it failed. It also seems very strange to return a 0 exit code if one or two of the cp or mv commands fails. But this code seems to do what you asked for.

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_lwp_sema_trywait

_lwp_sema_wait(2)						   System Calls 						 _lwp_sema_wait(2)

NAME

       _lwp_sema_wait, _lwp_sema_trywait, _lwp_sema_init, _lwp_sema_post - semaphore operations

SYNOPSIS

       #include <sys/lwp.h>

       int _lwp_sema_wait(lwp_sema_t *sema);

       int _lwp_sema_trywait(lwp_sema_t *sema);

       int _lwp_sema_init(lwp_sema_t *sema, int count);

       int _lwp_sema_post(lwp_sema_t *sema);

DESCRIPTION

       Conceptually,  a  semaphore  is an non-negative integer count that is atomically incremented and decremented. Typically this represents the
       number of resources available. The _lwp_sema_init() function initializes the count, _lwp_sema_post() atomically increments the  count,  and
       _lwp_sema_wait() waits for the count to become greater than 0 and then atomically decrements it.

       LWP  semaphores	must  be  initialized  before  use.  The _lwp_sema_init() function initializes the count associated with the LWP semaphore
       pointed to by sema to count.

       The _lwp_sema_wait() function blocks the calling LWP until the semaphore count becomes greater than 0 and then atomically decrements it.

       The _lwp_sema_trywait() function atomically decrements the count if it is greater than zero. Otherwise it returns an error.

       The _lwp_sema_post() function atomically increments the semaphore count. If there are any LWPs blocked on the semaphore, one is unblocked.

RETURN VALUES

       Upon successful completion, 0 is returned. A non-zero value indicates an error.

ERRORS

       The _lwp_sema_init(), _lwp_sema_trywait(), _lwp_sema_wait(), and _lwp_sema_post() functions will fail if:

       EINVAL	 The sema argument points to an invalid semaphore.

       EFAULT	 The sema argument points to an illegal address.

       The  _lwp_sema_wait() function will fail if:

       EINTR	The function execution was interrupted by a signal or fork(2).

       The  _lwp_sema_trywait() function will fail if:

       EBUSY	The function was called on a semaphore with a zero count.

       The  _lwp_sema_post() function will fail if:

       EOVERFLOW    The value of the sema argument exceeds SEM_VALUE_MAX.

SEE ALSO

       fork(2)

SunOS 5.11							    8 May 1998							 _lwp_sema_wait(2)