In some shells, all background processes are terminated when you logout. By default, both standard output and standard error are redirected to the file nohup.out . The syntax is similar to that of the at command. There are other queuing systems which may be installed on your system. Contact your local system adminstrator for information on queues as well as CPU limits for non-batch processes.
Most commands perform only simple tasks.
This leads to small and efficient commands. Several commands are used together to perform more complex tasks. The following commands, used alone or with other commands, are very useful. A powerful file processing tool awk matches patterns in files and performs operations on them. It is commonly used as a filter for many problems.