echo name the file that you want to read
read answer
if
then
echo you must enter a file name
fi
cat $answer
im trying to catch the error if user forget to enter the name of the file
anyone can help me ?
thanks:confused: (4 Replies)
Hi all
Is it possible to copy a structure of a directory only.
e.g.
I have a file with the following entries that is a result of a find :-
/dir1/dir2/file.dbf
/dir1/dir2/dir3/file1.dbf
/dir1/file.dbf
I want to copy these to a directory and keep the structure however starting at a new dir... (8 Replies)
Hi,
I am trying to write a script that will move all the files from source directory structure(multiple levels might exist) to destination directory structure. If a sub folder is source doesnot exist in destination then I have to skip and goto next level. I also need to delete the files in... (4 Replies)
Hi,
Can anyone help me with the following case structure?
echo "Please enter the date for which you want the Report:\c"
read dat
d1=`echo $dat|cut -c7-8`
m1=`echo $dat|cut -c5-6`
y1=`echo $dat|cut -c1-4`
yr=`expr "$d1" - 1`
case "$yr" in
0)
MONTH=`expr "$m1" - 1`... (4 Replies)
Hello Groups
I am trying to find out ways of comparing a value from a 'c' structure to a value in another 'C' structure. the 'C' structure can be a List or liked list as it contains lot many records.
if we loop it in both the structures it is going to consume time.
I am looking for a simple... (3 Replies)
Hi...
I have a directory which has multiple directories and sub directories inside...
what command should i use to get a list of all these directories, without the filenames.... (2 Replies)
I need to use the below global structure defined in code1.c in another code2.c
struct memIOptrs
{
const char *name;
unsigned char *virtptr;
}MEM_IO_PTRS;
I have a header file for the project codes.h, how should the structure be declared here.
Also, what if the structure was... (1 Reply)
Discussion started by: dragonpoint
1 Replies
LEARN ABOUT POSIX
semaphore.h
<semaphore.h>(P) POSIX Programmer's Manual <semaphore.h>(P)
NAME
semaphore.h - semaphores (REALTIME)
SYNOPSIS
#include <semaphore.h>
DESCRIPTION
The <semaphore.h> header shall define the sem_t type, used in performing semaphore operations. The semaphore may be implemented using a
file descriptor, in which case applications are able to open up at least a total of {OPEN_MAX} files and semaphores. The symbol SEM_FAILED
shall be defined (see sem_open()).
The following shall be declared as functions and may also be defined as macros. Function prototypes shall be provided.
int sem_close(sem_t *);
int sem_destroy(sem_t *);
int sem_getvalue(sem_t *restrict, int *restrict);
int sem_init(sem_t *, int, unsigned);
sem_t *sem_open(const char *, int, ...);
int sem_post(sem_t *);
int sem_timedwait(sem_t *restrict, const struct timespec *restrict);
int sem_trywait(sem_t *);
int sem_unlink(const char *);
int sem_wait(sem_t *);
Inclusion of the <semaphore.h> header may make visible symbols defined in the headers <fcntl.h> and <sys/types.h>.
The following sections are informative.
APPLICATION USAGE
None.
RATIONALE
None.
FUTURE DIRECTIONS
None.
SEE ALSO
<fcntl.h> , <sys/types.h> , the System Interfaces volume of IEEE Std 1003.1-2001, sem_destroy(), sem_getvalue(), sem_init(), sem_open(),
sem_post(), sem_timedwait(), sem_trywait(), sem_unlink(), sem_wait()
COPYRIGHT
Portions of this text are reprinted and reproduced in electronic form from IEEE Std 1003.1, 2003 Edition, Standard for Information Technol-
ogy -- Portable Operating System Interface (POSIX), The Open Group Base Specifications Issue 6, Copyright (C) 2001-2003 by the Institute of
Electrical and Electronics Engineers, Inc and The Open Group. In the event of any discrepancy between this version and the original IEEE
and The Open Group Standard, the original IEEE and The Open Group Standard is the referee document. The original Standard can be obtained
online at http://www.opengroup.org/unix/online.html .
IEEE /The Open Group 2003 <semaphore.h>(P)