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Symbols, numbers A B C D E F G H I J K L M N O P Q R S T U V W X Y

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• XAR (extended attribute record)
• xargs(C)
• .Xauthority
• xauth(X)
• X. (execute) files, ``The UUCP spool directory contents'', ``How UUCP works''
• xhost(X), ``Security in a networked environment'', ``Security in a networked environment''
• XON/XOFF
• XPG3
• XT console keyboard
• xtod(C)