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regex on first string in a variable.
Post 302231800 by Endo on Wednesday 3rd of September 2008 07:21:35 AM
09-03-2008
regex on first string in a variable.
Hi all, this is driving me nuts.
I need to evaluate if a variable in a shell script has a heading s or m character e.g. s92342394 or m9233489 if so then I need to get rid of them. I'm quite familiar with PERL and could do it there in 3 mins but I have not found a decent way to do this in a shell. And I can't use Perl for this example.
Any ideas are highly appreciated.
Thanks a ton
This is how far I got so far....
#for sem in `ipcs -s |grep dmadmin|awk '{print $2}'`
for sem in 's62464053' '53267' 's23760930' '452629'
do
#print $sem
if [echo $sem | egrep -e 's' ]
then
print $sem
else
echo "keins "
#print $sem
#ipcrm -s $sem
fi
done
I need to evaluate if a variable in a shell script has a heading s or m character e.g. s92342394 or m9233489 if so then I need to get rid of them. I'm quite familiar with PERL and could do it there in 3 mins but I have not found a decent way to do this in a shell. And I can't use Perl for this example.
Any ideas are highly appreciated.
Thanks a ton
This is how far I got so far....
#for sem in `ipcs -s |grep dmadmin|awk '{print $2}'`
for sem in 's62464053' '53267' 's23760930' '452629'
do
#print $sem
if [echo $sem | egrep -e 's' ]
then
print $sem
else
echo "keins "
#print $sem
#ipcrm -s $sem
fi
done
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LEARN ABOUT OSF1
sem_trywait
sem_wait(3) Library Functions Manual sem_wait(3) NAME
sem_wait, sem_trywait - Performs (or conditionally performs) a semaphore lock (P1003.1b) LIBRARY
Realtime Library (librt.so, librt.a) SYNOPSIS
#include <semaphore.h> int sem_wait ( sem_t *sem); int sem_trywait ( sem_t *sem); PARAMETERS
sem Specifies a pointer to the semaphore to be locked. DESCRIPTION
The sem_wait function locks the semaphore referenced by sem by performing a semaphore lock operation on it. If the semaphore value is zero, the sem_wait function blocks until it either locks the semaphore or is interrupted by a signal. The sem_trywait function locks a semaphore only if the semaphore is currently not locked. If the semaphore value is zero, the sem_trywait function returns without locking the semaphore. These functions help ensure that the resource associated with the semaphore cannot be accessed by other processes. The semaphore remains locked until the process unlocks it with a call to the sem_post function. Use the sem_wait function instead of the sem_trywait function if the process should wait for access to the semaphore. RETURN VALUES
If the sem_wait or sem_trywait function returns successfully, a value of 0 (zero) is returned and the function executes the semaphore lock operation. On an unsuccessful call, a value of -1 is returned and errno is set to indicate that an error occurred. The state of the semaphore remains unchanged. ERRORS
The sem_wait and sem_trywait functions fail under the following conditions: [EAGAIN] The semaphore was already locked and cannot be locked by the sem_trywait operation (sem_trywait only). [EINTR] A signal interrupted this function. [EINVAL] The sem argument does not refer to a valid semaphore. RELATED INFORMATION
Functions: sem_post(3) Guide to Realtime Programming delim off sem_wait(3)