Similar to TCP_Wrapper

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  Tr (UNIX)

  Tr (Unix)
  
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  Tty

  Tty (Unix)
  
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  Oracle Tuxedo

  Tuxedo (software)
  
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  Uconv

  Uconv
  
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  Uname

  Uname
  
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  Uniq

  Uniq
  
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  Unix to Unix Copy Protocol

  UUCP
  
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  Upstart

  Upstart (software)
  
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  Uptime

  Uptime
  
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  Uuencode

  Uuencoding
  
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  Vi

  Vi (text editor)
  ▲2 trends

  
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  W (UNIX)

  W (Unix)
  
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  Wait

  Wait (command)
  
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  Wall (UNIX)

  Wall (Unix)
  
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  Wc (UNIX)

  Wc (Unix)
  
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  Webmin

  Webmin
  
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  Whoami

  Whoami
  
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  Write (UNIX)

  Write (Unix)
  
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  WU-FTPD

  WU-FTPD
  
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  Xargs

  Xargs
  
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  XEmacs

  XEmacs
  
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  Xterm

  Xterm
  
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  Xz (ファイルフォーマット)

  
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  XZ Utils

  XZ Utils
  
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  Yes (UNIX)

  Yes (Unix)
  
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  ANSYS

  
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  お座りマスコット

  
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  Sun ONE

  Sun ONE