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When it starts, GHCi always reads and executes commands from $HOME/.ghci, followed by ./.ghci.
The .ghci in your home directory is most useful for turning on favourite options (eg. :set +s), and defining useful macros. Placing a .ghci file in a directory with a Haskell project is a useful way to set certain project-wide options so you don't have to type them everytime you start GHCi: eg. if your project uses GHC extensions and CPP, and has source files in three subdirectories A B and C, you might put the following lines in .ghci:
(Note that strictly speaking the -i flag is a static one, but in fact it works to set it using :set like this. The changes won't take effect until the next :load, though.)
Two command-line options control whether the .ghci files are read: