Definition of beaker for Students. : a cup or glass with a wide mouth and usually a lip for pouring that is used especially in science laboratories for holding and measuring liquids.
In Microsoft Windows, each environment variable's default value is stored in the Windows registry or set in the AUTOEXEC.BAT file. On Unix, a setuid program is given an environment chosen by its caller, but it runs with different authority from its caller.
1 To set an environment variable, use the command  export varname=value , which sets the variable and exports it to the global environment (available to other processes). 2  Enclosed the value with double quotes if it contains spaces. 3  To set a local variable, use the command  varname =value  (or  set varname =value ).