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
Shelf-stable food Management System must be in place. Verification and validation involves collecting documentary evidence of all aspects of compliance. Quality assurance extends beyond the packaging operations through distribution. Commercial canning involves cooking food and sealing it in sterilized tin cans. Home canning usually involves mason jars and boiling the containers to kill or weaken any remaining bacteria as a form of sterilization. Retort pouches involve heat processing the food in sterilized heat-stable flexible packages. This is used for camping food and military field rations The first shelf-stable formulation of ranch dressing, created in 1983, had a shelf life of 150 days.