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
History of bottle recycling in the United States the taste. The first firm to successfully introduce cans was the Gottfried Krueger Brewing Company of Newark, New Jersey in 1935. Since the 12-ounce cans were much smaller and lighter than glass bottles, they could more easily be packaged and transported. However, bottlers soon started selling "one-way" bottles as well. Now, bottles and cans did not have a brand logo anymore, but an engravement that said: "No Deposit, No Return". In the early 1950s, disposable cans and bottles made up 30% of beer that was sold packaged. Technological advances made disposable bottles more prevalent, but social and economic changes were