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kpathsea: Tilde expansion

 
 5.3.3 Tilde expansion
 ---------------------
 
 A leading '~' in a path element is replaced by the value of the
 environment variable 'HOME', or '.' if 'HOME' is not set.  On Windows,
 the environment variable 'USERPROFILE' is checked instead of 'HOME'.
 
    A leading '~USER' in a path element is replaced by USER's home
 directory from the system 'passwd' database.
 
    For example,
      setenv TEXINPUTS ~/mymacros:
 
 will prepend a directory 'mymacros' in your home directory to the
 default path.
 
    As a special case, if a home directory ends in '/', the trailing
 slash is dropped, to avoid inadvertently creating a '//' construct in
 the path.  For example, if the home directory of the user 'root' is '/',
 the path element '~root/mymacros' expands to just '/mymacros', not
 '//mymacros'.
 
    Tilde expansion is implemented in the source file 'kpathsea/tilde.c'.
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