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chdir($name); transfers to directory specified in $name
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mkdir($name, mode); # makes directory with given name $name and MODE (typically 3 octal characters such as 0755)
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opendir(DIRHANDLE, $name); # opens directory with directory handle DIRHANDLE. Such names can be assigned independently of all other names and are in particular not connected with FILEHANDLEs
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closedir(DIRHANDLE); # closes directory associated with handle DIRHANDLE
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readdir(DIRHANDLE); # returns file names (including . and ..) in directory with handle DIRHANDLE
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If scalar result, readdir returns "next" file name
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If array result, readdir returns all file names in directory
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