what is bash shell
The GNU project (GNU's Not UNIX) provides tools for UNIX-like system administration which are free software and comply to UNIX standards. Bash is an sh-compatible shell that incorporates useful features from the Korn shell (ksh) and C shell (csh).he GNU project (GNU's Not UNIX) provides tools for UNIX-like system administration which are free software and comply to UNIX standards. Bash is an sh-compatible shell that incorporates useful features from the Korn shell (ksh) and C shell (csh).