When `gnuplot` (Note:gnuplot ) is run, it looks for an initialization file
to load. This file is called `.gnuplot` on Unix and AmigaOS systems, and
`GNUPLOT.INI` on other systems. If this file is not found in the current
directory, the program will look for it in the home directory (under AmigaOS,
Atari(single)TOS, MS-DOS and OS/2, the environment variable `gnuplot` should
contain the name of this directory). Note: if NOCWDRC is defined during the
installation, `gnuplot` will not read from the current directory.
If the initialization file is found, `gnuplot` executes the commands in it.
These may be any legal `gnuplot` commands, but typically they are limited to
setting the terminal and defining frequently-used functions or variables.