Invoking the Shell
The command interpreter for the Bash shell (bash) or the Korn shell (ksh) can be invoked as follows:
bash [options] [arguments] ksh [options] [arguments]
ksh and Bash can execute
commands from a terminal, from a file (when the first
argument is an executable script), or from
standard input (if no arguments remain or if -s is
specified). Both shells automatically print prompts if standard input
is a terminal, or if -i is given on the command
line.
On many systems, /bin/sh is a link to Bash. When invoked as sh, Bash acts more like the traditional Bourne shell: login shells read /etc/profile and ~/.profile, and regular shells read $ENV, if it’s set. Full details are available in the bash(1) manpage.
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