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
Lew Hing stories of the building with the basement as storage. Lew Hing and other Family Association members lived on the third floor. In the 1880s–1890s, canning food was still a new concept. Lew Hing had embarked on a long period of trial and error before the cannery could reliably produce safe and edible canned foods. When food was not preserved properly or the cans were not fully sterilized (for example, each can had to be soldered individually by hand), noxious bacterial action would ruin the product, causing cans to swell and even explode. Eventually, Lew Hing developed safer and more effective