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.
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Discussion started by: Hijanoqu
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LEARN ABOUT LINUX
alien::package::rpm
Alien::Package::Rpm(3pm) User Contributed Perl Documentation Alien::Package::Rpm(3pm)NAME
Alien::Package::Rpm - an object that represents a rpm package
DESCRIPTION
This is an object class that represents a rpm package. It is derived from Alien::Package.
FIELDS
prefixes
Relocatable rpm packages have a prefixes field.
METHODS
checkfile
Detect rpm files by their extention.
install
Install a rpm. If RPMINSTALLOPT is set in the environement, the options in it are passed to rpm on its command line.
scan
Implement the scan method to read a rpm file.
unpack
Implement the unpack method to unpack a rpm file. This is a little nasty because it has to handle relocatable rpms and has to do a bit
of permissions fixing as well.
prep
Prepare for package building by generating the spec file.
cleantree
Delete the spec file.
build
Build a rpm. If RPMBUILDOPT is set in the environement, the options in it are passed to rpm on its command line.
An optional parameter, if passed, can be used to specify the program to use to build the rpm. It defaults to rpmbuild.
version
Set/get version.
When retreiving the version, remove any dashes in it.
postinst
postrm
preinst
prerm
Set/get script fields.
When retrieving a value, we have to do some truely sick mangling. Since debian/slackware scripts can be anything -- perl programs or
binary files -- and rpm is limited to only shell scripts, we need to encode the files and add a scrap of shell script to make it
unextract and run on the fly.
When setting a value, we do some mangling too. Rpm maintainer scripts are typically shell scripts, but often lack the leading shebang
line. This can confuse dpkg, so add the shebang if it looks like there is no shebang magic already in place.
Additionally, it's not uncommon for rpm maintainer scripts to contain bashisms, which can be triggered when they are ran on systems
where /bin/sh is not bash. To work around this, the shebang line of the scripts is changed to use bash.
Also, if the rpm is relocatable, the script could refer to RPM_INSTALL_PREFIX, which is set by rpm at run time. Deal with this by
adding code to the script to set RPM_INSTALL_PREFIX.
arch
Set/get arch field. When the arch field is set, some sanitizing is done first to convert it to the debian format used internally. When
it's retreived it's converted back to rpm form from the internal form.
AUTHOR
Joey Hess <joey@kitenet.net>
perl v5.12.3 2011-06-11 Alien::Package::Rpm(3pm)
09-28-2013
