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1. The problem statement, all variables and given/known data:
This is a problem I am having with my 2 semester senior project. I have a LAMP server running Ubuntu 9.10 with... (8 Replies)
I'm a bit new to bash programming and I was assigned the job of writing a script that will check to see if a program server is running and to restart the program if it is not up. The script is supposed to check the program every hour (which I have looked up and I believe I know how to do) and send... (3 Replies)
I just can't figure it out , so please just give me a pice of advise how to:
The existing Linux program foo2bar takes as its only argument the name of a single foo file and converts it to an appropriately-named bar file. Provide a script that when executed will run foo2bar against all foo... (4 Replies)
I'm trying to write a script the simplifies the execution of a program:
After starting the program (sh ~/.mfix/model/make_mfix) I am prompted four times for options:
Do you need SMP version? (y/n)
Do you need DMP version? (y/n)
Do you need debug version? (y/n)
Force re-compilation of... (2 Replies)
Hi,
I have create a Shell Script, with one function.
I want to call the script file in Java Program.
It working fine. but the problem is the function in the Shell Script is not executed.
Please suggest me,
Regards,
Nanthagopal A (2 Replies)
suppose i have a bash script:
#!/bin/bash
echo "hello"
echo "how are you"
echo "today"
how can i put the entire script above into a basic c program?
i do not want to translate the bash code to a c code. i want C to run the bash code. is this possible?
i found this on the... (15 Replies)
I wish to be able to give to a client the opportunity to :
0) Turn one of my ubuntu computers into a webserver
1) See a webpage after visiting a url where an external user/client can set a couple of variables (e.g. Number1= ?, Number2=?)
2) By pressing "run" the program runs on my machine
3)... (1 Reply)
I have a majority of this problem done but seem to be struggling on the last couple of steps. Here is the whole problem to help you guys get a better understanding.
Write a shell script that implements a simple spell checker.
The filename you will use for your script will be your Z-id followed... (1 Reply)
I can't seem to get this right. I've tried it every way imaginable using every trick I see on stackexchange and such. No luck. So nothing major here, something like:
#!/bin/bash
SEARCH="ARG1 ARG2 '((^EXACT$)|(.*InTheMiddle*)|(^AtBeginning*))'"
java -cp /my/class/path MyClassName $SEARCH... (3 Replies)
Discussion started by: stonkers
3 Replies
LEARN ABOUT REDHAT
system
SYSTEM(3) Linux Programmer's Manual SYSTEM(3)NAME
system - execute a shell command
SYNOPSIS
#include <stdlib.h>
int system(const char *string);
DESCRIPTION
system() executes a command specified in string by calling /bin/sh -c string, and returns after the command has been completed. During
execution of the command, SIGCHLD will be blocked, and SIGINT and SIGQUIT will be ignored.
RETURN VALUE
The value returned is -1 on error (e.g. fork failed), and the return status of the command otherwise. This latter return status is in the
format specified in wait(2). Thus, the exit code of the command will be WEXITSTATUS(status). In case /bin/sh could not be executed, the
exit status will be that of a command that does exit(127).
If the value of string is NULL, system() returns nonzero if the shell is available, and zero if not.
system() does not affect the wait status of any other children.
CONFORMING TO
ANSI C, POSIX.2, BSD 4.3
NOTES
As mentioned, system() ignores SIGINT and SIGQUIT. This may make programs that call it from a loop uninterruptable, unless they take care
themselves to check the exit status of the child. E.g.
while(something) {
int ret = system("foo");
if (WIFSIGNALED(ret) &&
(WTERMSIG(ret) == SIGINT || WTERMSIG(ret) == SIGQUIT))
break;
}
Do not use system() from a program with suid or sgid privileges, because strange values for some environment variables might be used to
subvert system integrity. Use the exec(3) family of functions instead, but not execlp(3) or execvp(3). system() will not, in fact, work
properly from programs with suid or sgid privileges on systems on which /bin/sh is bash version 2, since bash 2 drops privileges on
startup. (Debian uses a modified bash which does not do this when invoked as sh.)
The check for the availability of /bin/sh is not actually performed; it is always assumed to be available. ISO C specifies the check, but
POSIX.2 specifies that the return shall always be non-zero, since a system without the shell is not conforming, and it is this that is
implemented.
It is possible for the shell command to return 127, so that code is not a sure indication that the execve() call failed.
SEE ALSO sh(1), signal(2), wait(2), exec(3)
2001-09-23 SYSTEM(3)