4 examples for which

  # locates executable
which bro
        

  # Shows all install locations of an executable (in this case ruby)
which -a ruby
        

  # Edit 'myscript.sh' wherever it may be (assuming it is located in a $PATH directory)
vim $(which myscript.sh)
        

  # return 0 or 1 instead of file path
which -s some_file