Linux environment variable View and modification

For example, with commands

Echo $PATH

You can view the environment variable as/usr/local/sbin:/usr/local/bin:/usr/sbin:/usr/bin:/sbin:/bin

Add an environment to define a variable

A=${path}:.

$a assignment to the environment variable path=

Re-view Echo $PATH

The environment variable becomes/usr/local/sbin:/usr/local/bin:/usr/sbin:/usr/bin:/sbin:/bin:.

If you modify the environment variable home

See Echo $HOME First

You can see that the environment variable is/root

and make a=/home/

Assign a value home= $a

Re-view Echo $HOME

into a/home/.

Linux environment variable View and modification