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why there are six getty processes running on my desktop?

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linux-howto

http://unix.stackexchange.com – My desktop system is: $ uname -a Linux xmachine 3.0.0-13-generic #22-Ubuntu SMP Wed Nov 2 13:25:36 UTC 2011 i686 i686 i386 GNU/Linux By running ps a | grep getty, I get this output: 900 tty4 Ss+ 0:00 /sbin/getty -8 38400 tty4 906 tty5 Ss+ 0:00 /sbin/getty -8 38400 tty5 915 tty2 Ss+ 0:00 /sbin/getty -8 38400 tty2 917 tty3 Ss+ 0:00 /sbin/getty -8 38400 tty3 923 tty6 Ss+ 0:00 /sbin/getty -8 38400 tty6 1280 tty1 Ss+ 0:00 /sbin/getty -8 38400 tty1 5412 pts/1 S+ 0:00 grep --color=auto getty I think ttyX processes is for input/ouput (HowTos)