Working more productively with bash 2.x/3.xOverview and Introduction bash is a shell, a.k.a. command language interpreter for modern computers. It is Bourne shell (sh) compatible and incorporates useful features from the Korn shell (ksh) and C shell (csh). It conforms to the IEEE POSIX P1003.2/ISO 9945.2 Shell and Tools standard. Some of bash's features are, in no particular order: editing and completion; history and command re-entry; job
