/usr/share/doc/yorick-doc/html_xref/keywords-u.html
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unix julian_day,   make,   mkdirp,   plug_in,   silo_cd,   strglob,   strgrep,   sysafe,   tz_set,   unix_time  
upper case fits,   fits_get_xtension,   fits_init,   MultiFile,   strcase,   strmatch,   strtoupper,   strupper