Invoking the Shell (UNIX in a Nutshell: System V Edition) 4.7. Invoking the Shell The command interpreter for the Bourne shell (sh) or the Korn shell (ksh) can be invoked as follows: sh [options] [arguments] ksh [options] [arguments] ksh and sh 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). ksh and sh automatically print prompts if standard input is a terminal, or if -i is given on the command line. ArgumentsArguments are assigned in order to the positional parameters $1, $2, etc. If array assignment is in effect (-A or +A), arguments are assigned as array elements. If the first argument is an executable script, commands are read from it, and the remaining arguments are assigned to $1, $2, etc. Options -c strRead commands from string str. -DPrint all $"..." strings in the program. ksh93 only. -iCreate an interactive shell (prompt for input). -I fileCreate a cross-reference database for variable and command definitions and references. May not be compiled in. ksh93 only. -pStart up as a privileged user (Bourne shell: don't set the effective user and group IDs to those of the real user and group IDs. Korn shell: don't process $HOME/.profile). -rCreate a restricted shell (same as rksh or rsh). -sRead commands from standard input; output from built-in commands goes to file descriptor 1; all other shell output goes to file descriptor 2. The remaining options to sh and ksh are listed under the set built-in command. 4.6. Job Control4.8. Restricted Shells Copyright © 2003 O'Reilly & Associates. All rights reserved.