A, pwd: displays your current location
grammar
pwd [options] ...
Description
Print full file name of the working directory.
-L, - logical
from the environment using the PWD, even if it contains a symbolic link
-P, - physical
avoid all symbolic links
--help display this help and exit
--version
output version information and exit
Example:
1. Display logical path
2.pwd shows the current path, use -P if the source file is a link file path is displayed
Two, PS1 show in Bash line
Modify the PS1 environment displayed in bash line
Although this modified bash command line, but this is temporary, in order to permanently alter the need to go to the configuration file / etc / bashrc change
It can permanently change
Meaning PS1 environment variable representative
