(trailing '/' is required) before the source command. To simply use iraf you don't need to do either of these steps, they are mostly needed for development or e.g. to build external packages. I think your 'sudo' command is failing because you used the /home/iraf path instead of /iraf/iraf
If /home/iraf is where you actually unpacked the files then that is what you should use. 'source' is a C-shell command and is used to load the definitions in the irafuser.csh file, however this presumes that you are using a C-shell at the time and not a Bash shell. If this is the problem, type 'csh' before running the source/setenv commands.
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