If you installed ePiX for personal use, you need to ensure the
directory $HOME/bin is in your PATH. To check, do

echo $PATH

at a prompt. If $HOME/bin is not in your PATH, you need to edit
your shell configuration file. If you don't know what shell you
are using, try typing "?" at a prompt. If you get the message,
"bash: ?: command not found" you're running bash :)
If you get the message "?: no match", you're running a csh-type
shell.

If you use csh or a variant, put the line

setenv PATH $PATH:$HOME/bin

in your .cshrc file (in your home directory). 


If you use bash, put the line

export PATH=$PATH:$HOME/bin

in your .bashrc file.