True and false (commands) Bash: True and false (commands) In Unix-like operating systems, codice_1 and codice_2 are commands whose only function is to always return with a predetermined exit status. Programmers and scripts often use the exit status of a command to assess success (exit status zero) or failure (non-zero) of the command. The codice_1 and codice_2 commands represent the logical values of command success, because "true" returns 0, and "false" returns 1. The commands are usually employed in conditional statements and loops of shell scripts. For example, the following shell script repeats the "echo hello" loop until interrupted: while true do done The
Beverage-can stove including stoves made of tin cans such as cat food tins, tuna cans, and juice cans — the basic design is very similar. Windscreens/stands can be fabricated from tin cans, cut to size with ventilation holes added. Steel beverage cans of the classic 12 ounces design are still in limited use and while they are heat resistant, their coating will burn off and they will rust if not cared for. Each stove works well to supply one or two people. When used to cook larger meals (greater than 2 cups (0.5 litres)), it is less efficient than a more-powerful stove