Need help with simple startup bash script in CentOS
Hi guys,
I am very new to linux, so please bear with me.
I need a simple script (bash / .sh) to start 2 programs at server startup. Both programs should run in a detached screen of their own.
So basically:
1) start a detached screen with Program A running in it
2) start a new detached screen with Program B running in it
I have it already set up that it runs a 'start.sh' script on startup - so that part works. I just need the script itself.
I've tested a bunch of things that I've found on the internet, but nothing really works.
My latest test is this:
Code:
#!/bin/bash
screen -dmS "minecraft" sh -c 'cd /root/lastcrafters; ./MCMA2_Linux_x86_64' &
screen -dmS "teamspeak" sh -c '/root/lastcrafters/teamspeak/ts3server_startscript.sh start; exec bash' &
Each of the 2 commands work flawless when copy/pasted into Putty. But for some reason in the startup script they dont always work properly. Sometimes it works fine and both programs start as wanted. Sometimes only 1 of the 2 programs will start, and sometimes one of the programs will start doubled (once with a screen and once without a screen).
I have absolutely NO idea why this is. I have tried a sleep command between the 2 lines, to give it some time or something, but that didnt work either.
The 'exec bash' in the 2nd command is to keep the screen from closing, because teamspeak doesnt do anything in the screen and thus the screen would close from inactivity.
The 1st command doesnt need this, as Minecraft keeps spitting out things in the screen anyways.
I appreciate ANY and all help. Thank you for your time.
P.S.: I'm also open to any other/better way to get my goal accomplished. However, as I am completely new to linux, please explain thoroughly what I would have to do etc.
I'm sure I'm doing something wrong but as I am new to bash shell scripting I'm not sure what:
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Discussion started by: Hijanoqu
14 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)
09-28-2013
