The Korn shell has a number of options that specify your environment and control execution. They can be enabled/disabled with the set command or on the ksh command line.
| a | automatically export variables that are defined |
| b | execute all background jobs at a lower priority |
| c cmds | read and execute cmds (w/ksh only) |
| e | execute ERR trap (if set) on non-zero exit status from any commands |
| f | disable file name expansion |
| h | make commands tracked aliases when first encountered |
| i | execute in interactive mode (w/ksh only) |
| k | put variable assignment arguments in environment |
| m | enable job control (system dependent) |
| n | read commands without executing them |
| o allexport | automatically export variables that are defined |
| o bgnice | execute all background jobs at a lower priority |
| o emacs | use emacs-style editor for in-line editing |
| o errexit | execute ERR trap (if set) on non-zero exit status from any commands |
| o gmacs | use gmacs-style editor for in-line editing |
| o ignoreeof | do not exit on end of file (default Ctl-d); use exit |
| o keyword | put variable assignment arguments in environment |
| o markdirs | display trailing / on directory names resulting from file name substitution |
| o monitor | enable job control (system dependent) |
| o noclobber | prevent I/O redirection from truncating existing files |
| o noexec | read commands without executing them |
| o noglob | disable file name expansion |
| o nolog | do not save function definitions in history file |
| o nounset | return error on substitution of unset variables |
| o privileged | disable processing of $HOME/.profile, and use /etc/suid_profile instead of ENV file |
| o trackall | make commands tracked aliases when first encountered |
| o verbose | display input lines as they are read |
| o vi | use vi-style editor for in-line editing |
| o viraw | process each character as it is typed in vi mode |
| o xtrace | display commands and arguments as executed |
| p | disable processing of $HOME/.profile, and use /etc/suid_profile instead of ENV file |
| r | run a restricted shell (w/ksh only) |
| s | read commands from standard input |
| u | return error on substitution of unset variables |
| v | display input lines as they are read |
| x | display commands and arguments as executed |
| ?/span> | disable v and x flags; don't process remaining flags |
