[astronomy]
how to download and install latest patch of IRAF with only two-commands.
IRAFの最新パッチの当て方

% cd $iraf
% make latest

that's all.
こんだけ

be aware of your original cl clripts.
自前のclスクリプトがある場合は要注意

reference
参照
ftp://iraf.noao.edu/iraf/v216/PCIX/RELEASE.txt