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
Convenience food were used by travelers. Cornmeal that was ground and dried, referred to as "pinolli", was used by travelers as a convenience food in this manner. Canned food was developed in the 19th century, primarily for military use, and became more popular during World War I. The expansion of canning depended significantly upon the development of a machine for producing large quantities of cans very cheaply. Before the 1850s, making a can for food required a skilled tinsmith; afterwards, an unskilled laborer, operating a can-making machine, could produce 15 times as many cans each day. One of the earliest industrial-scale processed