True and false (commands) 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 commands
Val de Cans International Airport South Atlantic Ocean to Sierra Leone in West Africa. These facilities provided the necessary logistical support for the thousands of planes that, manufactured in Canada and the United States were moved to North Africa and Europe. After protracted negotiations between Brazil and the United States, airstrips were built at Belém for the Air Transport Command with two runways measuring 1,500 x 45 meters on a basis of concrete and asphalt and comprising modern airport facilities, able to meet efficiently civil aviation and military needs. Val de Cans and other air bases used by the Americans during World War II were