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
Campbell's Soup Cans which is then transferred with glue onto silk. In either case, one needs to produce a glue-based version of a positive two-dimensional image (positive means that open spaces are left where the paint will appear). Usually, the ink is rolled across the medium so that it passes through the silk and not the glue. Campbell's Soup cans were among Warhol's first silkscreen productions; the first were U.S. dollar bills. The pieces were made from stencils; one for each color. Warhol did not begin to convert photographs to silkscreens until after the original series of Campbell's Soup cans had been produced.