Doriano Blengino wrote: > Lee McPherson ha scritto: > >> One alternative is to use the program parashell >> >> Software: http://parashell.sourceforge.net/ >> >> Docs: http://parashell.sourceforge.net/docs/parallel.txt >> >> Apparently, all you need to do is send it byte commands. (and you need >> root access) I bet that would be much easier if it works as advertised. >> >> > Nice, but don't depict this problem (a printer attached to a computer) > as more difficult than it really is. > It is possible to do an: > > echo -e "Hello world\r" >/dev/lp0 > > or > > PRINT #hPrinter, "Hello world" > > the kernel driver for parallel port already does everything we need (to > make a normal printer work) - why point out difficult (and useless) things? > > And, to better reply to Vassilis about cat and echo: > > cat file > /dev/lp0 > > /bin/cat is a Unix command, which takes the content of a file and send it, in > this case, to the first parallel printer. You can open a terminal, and type: > > cat /etc/passwd >/dev/lp0 > > to dump the contents of /etc/passwd to the printer. It will work, not very > well though... > > echo "test" > /dev/lp0 > > /bin/echo is another Unix command which sends data somewhere. The data is > taken directly from the command line, not a file. In this example... guess > where "test" is dumped to? > > These two commands will work, at least at a certain degree, if your hardware > is OK and your linux kernel correctly manages printer ports. Two modules > named "lp" and "parport" should be present and loaded for this. If it is not > done automatically, try to > > modprobe parport > modprobe lp > > (or "su modprobe blah blah blah blah"). If you don't know what cat, echo, > modprobe, shell are, then read a good Unix/Linux book. > > Regards, > Doriano > > Sorry, don't know where my head was. Your way is much, much simpler. The prog I found just takes the ASCII input method out for users who want to drive circuits of specific pins of the parallel port.
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