Bash Calculator issue Post: 302336231

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Top Forums Shell Programming and Scripting Bash Calculator issue Post 302336231 by jsells20 on Tuesday 21st of July 2009 03:17:41 PM

07-21-2009

Registered User

Bash Calculator issue

Hello, I'm relatively new to using bc so I could use some help. In this script im working on I want to have the bc function to calculate float numbers for imagemagicks convert charcoal. Below is what I'm talking about. There are no syntax errors but when it outputs the users frames for example 0-10 the filter remains at an integer value. I want the filter to integrate with bc. I appreciate all help I can get. Thank you.

Code:

    count=$START
    SETSTEPS=$ (echo "scale=1; 1/25" | bc)

    SETTING=$SETSTEPS
    echo $SETSTEPS

        while [ $count -le $END ]; 
        do
        #echo $count

    #set for padding of 4 from 0-999.

        if [ $count -lt 10 ]; then 
        convert ${IMGDIR}${IMG} -charcoal $count ${OUTDIR}${OUT}.000$count.jpg
        fi

        if [ $count -ge 10 ] && [ $count -le 99 ]; then
        convert ${IMGDIR}${IMG} -charcoal $count ${OUTDIR}${OUT}.00$count.jpg
        fi
        
        if [ $count -ge 100 ] ; then
        convert ${IMGDIR}${IMG} -charcoal $count ${OUTDIR}${OUT}.0$count.jpg
        fi


        SETTING=$(echo "scale=4; $SETTING+$SETSTEPS" | bc)
        echo "processing frame: $count"

        let count=count+1

        # to view in maya's fcheck plugin
        #fcheck -n $START $END 1 ${OUTDIR}${OUT}.@@.jpg
        done

jsells20

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_lwp_sema_post

_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)