A leading `~' in a path element is replaced by the value of the
environment variable HOME, or `.' if HOME is not set.
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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