The background program
background launches a command in the background, then goes on with the execution flow.Interface
In an execlineb script:
background [ -d ] { prog1... } prog2...
- background reads a prog1... command in a block and unquotes it.
- It spawns a child executing prog1....
- It sets the ! environment variable to the pid of the prog1... process.
- It then execs into prog2....
Options
- -d : doublefork. If the -d option is set, prog1... will run as a grandchild of background.
Notes
- background prog1... "" prog2... is equivalent to sh -c 'prog1... & ; exec prog2...'.