Does not change any of the flags. This option is useful in setting $1 to -.

Marks variables which are modified or created for export.

Exits immediately if a command exits with a non-zero exit status.

Disables file name generation.

Locates and remembers function commands as functions are defined. Function commands are normally located when the function is executed.

All keyword arguments are placed in the environment for a command, not just those that precede the command name.

Reads commands but does not execute them.

Exits after reading and executing one command.

Treats unset variables as an error when substituting.

Prints shell input lines as they are read.

Prints commands and their arguments as they are executed.

A single word (or quoted string).

A space-separated list of words enclosed in parentheses.

Array assignment. Unsets the variable name and assigns values sequentially from the list arg. If +A is used, the variable name is not unset first.

All subsequent variables that are defined are automatically exported.

Causes the shell to notify the user asynchronously of background job completions.

Prevents existing files from being overwritten by the shell's > redirection operator. The >| redirection operator overrides this noclobber option for an individual file.

If a command has a non-zero exit status, executes the ERR trap, if set, and exits. This mode is disabled while reading profiles.

Disables file name generation.

Each command becomes a tracked alias when first encountered.

All variable assignment arguments are placed in the environment for a command, not just those that precede the command name.

Background jobs run in a separate process group and a line prints 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.

Reads commands and checks them for syntax errors, but does not execute them. Ignored for interactive shells.

Writes the current option settings to standard output in a format that is suitable for reinput to the shell as commands that achieve the same option settings.

The option argument can be one of the following option names: allexport

Disables processing of the $HOME/.profile file and uses the file /etc/suid_profile instead of the ENV file. This mode is on whenever the effective uid is not equal to the real uid, or when the effective gid is not equal to the real gid. Turning this off causes the effective uid and gid to be set to the real uid and gid.

Sorts the positional parameters lexicographically.

Exits after reading and executing one command.

Treats unset parameters as an error when substituting.

Prints shell input lines as they are read.

Prints commands and their arguments as they are executed.

Turns off -x and -v flags and stops examining arguments for flags.

Does not change any of the flags. This option is useful in setting $1 to a value beginning with -. If no arguments follow this flag then the positional parameters are unset.

1. Read-only variables with values cannot be reset.

2. Variables that were unset at the time they were output are not reset to the unset state if a value is assigned to the variable between the time the state was saved and the time at which the saved output is reinput to the shell.

1. Variable assignment lists preceding the command remain in effect when the command completes.

2. I/O redirections are processed after variable assignments.

3. Errors cause a script that contains them to abort.

4. Words, following a command preceded by ** that are in the format of a variable assignment, are expanded with the same rules as a variable assignment. This means that tilde substitution is performed after the = sign and word splitting and file name generation are not performed.

Set the export attribute for each variable whose name does not contain a . that you assign a value in the current shell environment.

Assign the arguments sequentially to the array named by name starting at subscript 0 rather than to the positional parameters.

The shell writes a message to standard error as soon it detects that a background job completes rather than waiting until the next prompt.

Enable {...} group expansion. On by default.

Prevents existing regular files from being overwritten using the > redirection operator. The >| redirection overrides this noclobber option.

A simple command that has a non-zero exit status causes the shell to exit unless the simple command is:

Pathname expansion is disabled.

Causes ** by itself to also match all sub-directories during pathname expansion.

Obsolete. Causes each command whose name has the syntax of an alias to become a tracked alias when it is first encountered.

Enable !-style history expansion similar to csh.

This is obsolete. All arguments of the form name=value are removed and placed in the variable assignment list for the command. Ordinarily, variable assignments must precede command arguments.

When enabled, the shell runs background jobs in a separate process group and displays a line upon completion. This mode is enabled by default for interactive shells on systems that support job control.

The shell reads commands and checks for syntax errors, but does not execute the command. Usually specified on command invocation.

If option is not specified, the list of options and their current settings is written to standard output. When invoked with a + the options are written in a format that can be input again to the shell to restore the settings. This option can be repeated to enable or disable multiple options. The value of option must be one of the following: allexport

Privileged mode. Disabling -p sets the effective user id to the real user id, and the effective group id to the real group id. Enabling -p restores the effective user and group ids to their values when the shell was invoked. The -p option is on whenever the real and effective user id is not equal or the real and effective group id is not equal. User profiles are not processed when -p is enabled.

Restricted. Enables restricted shell. This option cannot be unset once enabled.

Sort the positional parameters

Obsolete. The shell reads one command and then exits.

If enabled, the shell displays an error message when it tries to expand a variable that is unset.

Verbose. The shell displays its input onto standard error as it reads it.

Execution trace. The shell displays each command after all expansion and before execution preceded by the expanded value of the PS4 parameter.

Successful completion.

An error occurred.

Where name refers to a function name, the shell unsets the function definition.

If name refers to variable that is a reference, the variable name is unset rather than the variable it references. Otherwise, this option is equivalent to the -v option.

Where name refers to a variable name, the shell unsets it and removes it from the environment. This is the default behavior.

Successful completion. All names were successfully unset.

An error occurred, or one or more name operands could not be unset

Causes the output to be in the form of export commands that can be used as input to the shell to recreate the current exports.

Successful completion.

An error occurred.

1. Variable assignment lists preceding the command remain in effect when the command completes.

2. I/O redirections are processed after variable assignments.

3. Errors cause a script that contains them to abort.

4. They are not valid function names.

5. Words, following a command preceded by ++ that are in the format of a variable assignment, are expanded with the same rules as a variable assignment. This means that tilde substitution is performed after the = sign and field splitting and file name generation are not performed.