PATH is a string, $ PATH PATH is a variable representation
Within the current working directory is generally not in the search range (value of the PATH environment variable does not contain ./ The current working directory)
Set Environment Variables
$ Export PATH = $ PATH: you need to add a directory
View Variable
$ export
View the current working directory absolute path
add files
export PATH=$PATH:$PWD
Add to the environment variables
PATH=$PATH:/home/