An enchanced version of the korn shell, called ksh93, is also
available. The enhanced Korn shell has additional features that are not
available in the default Korn shell. For information regarding these
additional features, refer to Enhanced Korn Shell in
AIX 5L Version 5.1 System User's Guide: Operating
System and Devices.
| -a
| Exports automatically all subsequent parameters that are defined.
|
| -c String
| Causes the Korn shell to read commands from the String
variable. This flag cannot be used with the -s flag or with
the File[Parameter] parameter.
|
| -e
| Executes the ERR trap, if set, and exits if a command has a
nonzero exit status. This mode is disabled while reading
profiles.
|
| -f
| Disables file name substitution.
|
| -h
| Designates each command as a tracked alias when first encountered.
|
| -i
| Indicates that the shell is interactive. An interactive shell is
also indicated if shell input and output are attached to a terminal (as
determined by the ioctl subroutine). In this case, the
TERM environment variable is ignored (so that the kill 0
command does not kill an interactive shell) and the INTR signal is
caught and ignored (so that a wait state can be interrupted). In all
cases, the QUIT signal is ignored by the shell.
|
| -k
| Places all parameter assignment arguments in the environment for a
command, not just those arguments that precede the command name.
|
| -m
| Runs background jobs in a separate process and prints a line upon
completion. The exit status of background jobs is reported in a
completion message. On systems with job control, this flag is turned on
automatically for interactive shells.
|
| -n
| Reads commands and checks them for syntax errors, but does not execute
them. This flag is ignored for interactive shells.
|
| -o Option
| Prints the current option settings and an error message if you do not
specify an argument. You can use this flag to enable any of the
following options:
- allexport
- Same as the -a flag.
- errexit
- Same as the -e flag.
- bgnice
- Runs all background jobs at a lower priority. This is the default
mode.
- emacs
- Enters an emacs-style inline editor for command entry.
- gmacs
- Enters a gmacs-style inline editor for command entry.
- ignoreeof
- Does not exit the shell when it encounters an end-of-file
character. You must use the exit command, or override the
flag and exit the shell by pressing the Ctrl-D key sequence more than 11
times.
- keyword
- Same as the -k flag.
- markdirs
- Appends a / (slash) to all directory names that are a result of
filename substitution.
- monitor
- Same as the -m flag.
- noclobber
- Prevents redirection from truncating existing files. When you
specify this option, use the redirection symbol >| (right caret,
pipe symbol) to truncate a file.
- noexec
- Same as the -n flag.
- noglob
- Same as the -f flag.
- nolog
- Prevents function definitions from being saved in the history file.
- nounset
- Same as the -u flag.
- privileged
- Same as the -p flag.
- verbose
- Same as the -v flag.
- trackall
- Same as the -h flag.
- vi
- Enters the insert mode of a vi-style inline editor for command
entry. Entering escape character 033 puts the editor into the move
mode. A return sends the line.
- viraw
- Processes each character as it is typed in vi mode.
- xtrace
- Same as the -x flag.
You can set more than one option
on a single ksh command line.
|
| -r
| Runs a restricted shell. With a restricted shell you cannot:
- Change the current working directory.
- Set the value of the SHELL, ENV, or
PATH variable.
- Specify the pathname of a command that contains a /
(slash).
- Redirect output of a command with > (right
caret), >| (right caret, pipe symbol), <> (left
caret, right caret), or >> (two right carets).
|
| -s
| Causes the ksh command to read commands from the standard
input. Shell output, except for the output of the special commands, is
written to file descriptor 2. This parameter cannot be used with the
-c flag or with the File[Parameter]
parameter.
|
| -t
| Exits after reading and executing one command.
|
| -u
| Treats unset parameters as errors when substituting.
|
| -v
| Prints shell input lines as they are read.
|
| -x
| Prints executed commands and their arguments.
|