How do i find the source of a command in bash?

giraffelife

This is a really useful command; to see what types of source(s) for a command, i.e. is is a binary, alias, or function, it can be more than one. For instance dir is an function and a binary.

$ type -a dir
dir is a function
dir () 
{ 
    find . -iname "$@" -exec ls -lh {} \;;
    find . -iname "$@" -print0 | xargs -r0 du -csh | tail -n 1
}
dir is /bin/dir
$ type cat
cat is hashed (/bin/cat)
$ type -a ll
ll is aliased to `ls -alF'