Sixth day of Learning Linux

1.Shell programming

Bash variables: all stored in string format

X=5 equal to or not have a space, will be treated as a command

How to Invoke:

Echo $x This method cannot be numerically calculated, the output of a non-existent variable is null

Set-u Setting variable Error

x= "$x" x=${x}e3 variable overlay, at this time x=532e3

unset x Delete Variable

Set view set of variables

Pstree Print environment variable tree

Bash enters a new branch

Export z=1 Setting environment variables

Env View System Information

Sixth day of Learning Linux