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This is more of a general Linux question, but from the manpage of bash (likely your shell):
If a command is terminated by the control operator &, the shell executes the command in the background in a subshell. The shell does not wait for the command to finish, and the return status is 0.
In other words: adding the '&' allows you to continue to use the terminal, while roscore is running in the background. If you did not add the '&', roscore would start and all input (into the terminal window) would be directed to roscore. You'd need a second terminal to do your work in.
For reference: man bash.
I run other command after roscore &, and I find I can not use Ctrl+C to terminate it.
Yes. I run other command such as ls after roscore &, and the terminal can correctly display the files. However, I can not use Ctrl+C to terminate roscore after I run ls.
You can use fg to bring running "jobs" to the "foreground". So if you type jobs you'll see a list of all running jobs. They'll all have a unique number like [#]. So if roscore was job 1, you could type fg %1 and that would bring roscore to the foreground and Ctrl-C could kill it.
Asked: 2014-11-19 08:46:55 -0500
Seen: 4,396 times
Last updated: Nov 19 '14
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