 | This article needs additional citations for verification. (December 2018) |
| Original author(s) | John Mashey |
|---|---|
| Developer(s) | AT&T Bell Laboratories |
| Operating system | Unix |
| Available in | English |
| Type | Unix shell |
The PWB shell (also known as the Mashey shell) was a Unix shell.[1]
- ^ Mashey, John R. (1976-10-13). "Using a Command Language as a High-Level Programming Language". San Francisco, California, USA: Proceedings of the 2nd International Conference on Software Engineering. pp. 169–176. Archived from the original on 12 April 2020. Retrieved 12 April 2020.
In addition to these variables [$n, $p, $r, $s, and $t], the following is provided: $$ contains a 5-digit number that is the unique process number of the current shell. In some circumstances, it is necessary to know the number of a process, in order to kill it, for example. However, its most common use to date has been that of generating unique names for temporary files.