FLTK and ffmpeg

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FLTK and ffmpeg

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Juergen
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RE: FLTK and ffmpeg

mikshaw Wrote:

Quote:

>/dev/null & echo $!"

Looks like this is where I was going wrong.
I'd tried "urxvt & && echo $!" and "urxvt &; echo $!", which choked, and "(urxvt &) && echo $!", which echoed nothing.
I didn't know using a single "&" would separate the commands, but that makes sense to me now.

All control operators terminate a command. Control operators are "|" "&" "||" "&&" ";" ";;" "(" ")" and a new line.

You can also write someting like os.execute("cmd1 \n cmd2 \n cmd3") or use the ";" operator to separate two commands, but you can't use two control operators together (except for newline or the subshell operators). The || and && operators also require two expressions (expression1 || expression2) which cmd& can't be because it is executed in the background and can't give anything back.

Actually the bash manpage isn't that bad. If you open it and go down a few paragraphs to the "DEFINITIONS" section you'll see it is pretty easy. Although you should be aware that bash is only a bourne compatible shell and is a mix of Korn shell, Bourne shell and POSIX shell (which is also a mix). So not everything in that manual applies to other shells.

Juergen

04-08-2008 11:01 PM