Why the command in /root/.bash_profile start twice?

问题

Here is my /root/.bash_profile:

export DISPLAY=:42 && cd /home/df/SimulatedRpu-ex/bin && ./SimulatedRpu-V1 &

When I start my server,I run ps aux | grep SimulatedRpu and here is the output:

root      2758  0.2  1.0  62316 20416 ?        Sl   14:35   0:00 ./SimulatedRpu-V1
root      3197  0.5  0.9  61428 19912 pts/0    Sl   14:35   0:00 ./SimulatedRpu-V1
root      3314  0.0  0.0   5112   716 pts/0    S+   14:35   0:00 grep SimulatedRpu

So,the program print error message about the port is already used. But why the command in /root/.bash_profile start twice? Please help me,thank you!By the way,I use Redhat Enterprise 5.5

回答1:

The profile is read every time you log in. So just by logging in to run the ps aux | grep SimulatedRpu, you run the profile once more and thus start a new process.

You should put the command into an init script instead.

[EDIT] You should also run Xvnc in the same script - that way, you can start and stop the display server together with your app.

回答2:

Try it like

if ! ps aux | grep '[S]imulateRpu'; then
    export DISPLAY=:42 && cd /home/df/SimulatedRpu-ex/bin && ./SimulatedRpu-V1 &
fi;

This way it will first check if if the application is not running yet. The [] around the S are to prevent grep from finding itself ;)

来源：https://stackoverflow.com/questions/9715063/why-the-command-in-root-bash-profile-start-twice