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## B.3.1 Case Matters!

One really important first thought is that Linux commands and Linux filenames are case specific. A file named TkEmc.txt is not the same file as Tkemc.txt. Most of the time a Linux program WILL NOT find TkEmc.txt if you tell it to find Tkemc.txt or tkemc.txt. The command ``CD'' is not the same command as ``cd'' is. When you are in the middle of a text based session and you ask to see the contents of a file and the answer comes back

  cat: templex: No such file or directory

remember that case matters.