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1. Shell Programming and Scripting
Hi,
I'm trying to edit my working bash script to an SGE script in order to submit it as a job to the cluster.
Currently I have:
#!/bin/bash
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... (0 Replies)
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2. Shell Programming and Scripting
hello
my script is submitting POST-data to a site
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3. UNIX for Dummies Questions & Answers
Dear all,
I have a simple question. I have many cut commands like below to run. I am wondering how to just type and submit all the commands at once and then each of the command will be run automaticaly one by one. Thanks a lot!
cut -d ' ' -f 3-2002 ... (4 Replies)
Discussion started by: forevertl
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4. Post Here to Contact Site Administrators and Moderators
have a doubt.
Where I can submit shell scripts done by me ? (5 Replies)
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5. Ubuntu
I'm trying to upload a file to a page using curl and after uploading that file i want to store the redirecting page so i can download the results.
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6. Shell Programming and Scripting
Hi,
I have a custom HTML form that has a couple radio buttons and a text field that requires a number.
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hello admins,
i dont use unix.com very often - but when i do have questions, i submit them at the site - but now I cannot submit anything in any forum on the site. The is the only forum i could add a new thread.
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8. Shell Programming and Scripting
Hi all,
I am currently facing a problem when i am submitting a script to run in the background to collect statistics round the clock on an AIX box. I don't have root authority nor can I set it in cron.
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9. Shell Programming and Scripting
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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)
