so to correctly output the result i need this command?
printf(pipeout, bytes);
For the third time, don't use printf. printf expects NULL-terminated C strings and raw data read from a file is almost never a NULL-terminated C string.
To output properly, use the code I gave you:
Quote:
Originally Posted by Corona688
This is not pseudocode. read() and write() are system calls. All of that is necessary, including the loop, to properly handle the program's output, otherwise it might stop before the program's actually finished.
hi all. thanks for looking
i am doing some homework.
one question is that when type
wc
and then how to tell the program that we have finished entering data?
also
why do some operating systems report 22 as the number of bytes in the file above, while others only 20?
thanks so much,... (1 Reply)
Hello,
I have problem in writing the shell script involving MPE command STREAM related to HP-UX and Unix command. Script is
sh "nlshCMD 'STREAM <job name1>' | 'SHOWJOB' | grep $HPJOBNUM"
sh "nlshCMD 'STREAM <job name2>' | 'SHOWJOB' | grep $HPJOBNUM"
sh "nlshCMD 'STREAM <job name3>' |... (0 Replies)
Hello,
I have problem in writing the shell script involving MPE command STREAM related to HP-UX and Unix command. Script is
sh "nlshCMD 'STREAM <job name1>' | 'SHOWJOB' | grep $HPJOBNUM"
sh "nlshCMD 'STREAM <job name2>' | 'SHOWJOB' | grep $HPJOBNUM"
sh "nlshCMD 'STREAM <job name3>' |... (1 Reply)
Hi ,
I have a piece of code ...wherein I need to assign the following ...
1) A command line argument to a variable
e.g origCount=ARGV
2) A unix command to a variable
e.g result=`wc -l testFile.txt`
in my awk shell script
When I do this :
print "origCount" origCount --> I get the... (0 Replies)
Hi,
Well my title isn't very clear I think. So to understand my goal:
I have a script "test1"
#!/bin/bash
xvkbd -text blabla
with xbindkeys, I bind F5 key in order it runs my test1 script
So when I press F5, test1 runs.
I'm under Emacs/Vi and I press F5 in order to have "blabla" be... (0 Replies)
I am going through the Unix Made Easy second edition book by John Muster. So far it's been very informative and I can tell it may be a bit out of date.
In one of the exercises it talks about the "sort" command and using it to sort column's of data etc. The "sort" command has changed a bit and... (1 Reply)
Hi all,
I wish to know whether Unix can access window's file in Unix's terminal?
Apart from that, how to copy files or share files between Window and Unix? I get to know of secure copy, however, my company's Unix does not support the feature of secure copy? Any other method for me to share/... (5 Replies)
I'm trying to write a bash script called YN that looks like the following
YN "Specify a question" "doThis" "doThat"
where "doThis" will be executed if the answer is "y", otherwise "doThat".
For example
YN "Do you want to list the file dog?" "ls -al dog" ""
Here's my attempt... (3 Replies)
Hi Folks,
I have a file name abc.xml in my windows machine at the location c:\ytr\abc.xml
which I want to place at the unix box machine inside cde directory.. at the following location that is /opt/app/cde/
now the credentials of unix box are
abc345 -->(dummyid)
ftyiu88--->(dummy passwd)
... (4 Replies)
Discussion started by: punpun66
4 Replies
LEARN ABOUT HPUX
system
system(3S)system(3S)NAME
system() - issue a shell command
SYNOPSIS DESCRIPTION
executes the command specified by the string pointed to by command. The environment of the executed command is as if a child process were
created using (see fork(2)), and the child process invoked the sh-posix(1) utility via a call to (see exec(2)) as follows:
ignores the and signals, and blocks the signal, while waiting for the command to terminate. If this might cause the application to miss a
signal that would have killed it, the application should examine the return value from and take whatever action is appropriate to the
application if the command terminated due to receipt of a signal.
does not affect the termination status of any child of the calling processes other than the process or processes it itself creates.
does not return until the child process has terminated.
APPLICATION USAGE
If the return value of is not -1, its value can be decoded through the use of the macros described in For convenience, these macros are
also provided in
Note that, while must ignore and and block while waiting for the child to terminate, the handling of signals in the executed command is as
specified by fork(2) and exec(2). For example, if is being caught or is set to when is called, the child is started with handling set to
Ignoring and in the parent process prevents coordination problems (such as two processes reading from the same terminal) when the executed
command ignores or catches one of the signals.
RETURN VALUE
If command is null, returns non-zero.
If command is not null, returns the termination status of the command language interpreter in the format specified by wait(2). The termi-
nation status of the command language interpreter is as specified for sh-posix(1), except that if some error prevents the command language
interpreter from executing after the child process is created, the return value from is as if the command language interpreter had termi-
nated using If a child process cannot be created, or if the termination status for the command language interpreter cannot be obtained,
returns -1 and sets to indicate the error.
DIAGNOSTICS
forks to create a child process which, in turn, in order to execute string. If the fork fails, returns -1 and sets If the exec fails,
returns the status value returned by (see wait(2)) for a process that terminates with a call of
ERRORS
If errors are encountered, sets values as described by fork(2).
FILES SEE ALSO sh(1), fork(2), exec(2), wait(2), thread_safety(5).
STANDARDS CONFORMANCE system(3S)