Naming variables

A variable name in bash must begin with a letter or an underscore, and can be followed by any letter or number, or more underscores.

These variables names are all legal:

• myvar
• MYVAR
• Myvar
• mYVAR
• _myvar
• my_var
• myvar_
• my012

These variable names are not allowed:

• 1myvar
• my-var
• my.var
• my:var