index_O

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od command 
one-liner commands, Unix 
one-time passwords 
OpenBSD
    dealing with disk hogs 
    default shell for 
    skeleton home directory location 
    spoofing with 
    swap files, adding 
openssl command 
OPIE (One-time Passwords In Everything) 
opieinfo command 
opiekey command 
opiepasswd command  2nd 
optimizing
    file servers 
    kernels 
    mail servers 
    network performance 
    software compiling 
    web servers 
OTP (One Time Password) system 
    choosing when to use 
    generating responses 
Owen, Howard