Unsupported titles/Double period

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  1. (computing) The parent directory.
    Type "cd Photos/Wallpapers" to go to the Wallpapers folder. Then you can type "cd .." to go to back to the Photos folder.
  2. (Should we delete(+) this sense?) (programming) The concatenation operator in Lua.
    flavor = "chocolate"
    sentence = "I want a " .. flavor .. " ice cream." -- the resulting sentence is "I want a chocolate ice cream."
  3. (programming) A range operator in some programming languages, including Perl.
    foreach(1 .. 10) # this is a range from 1 to 10