-a Mark variables which are modified or created
for export.
-e Exit immediately if a command exits with a
non-zero exit status.
-f Disable file name generation.
-h Locate and remember function commands as func-
tions are defined (function commands are nor-
mally located when the function is executed).
-k All keyword arguments are placed in the
environment for a command, not just those that
precede the command name.
-n Read commands but do not execute them.
-t Exit after reading and executing one command.
-u Treat unset variables as an error when substi-
tuting.
-v Print shell input lines as they are read.
-x Print commands and their arguments as they are
executed.
- Do not change any of the flags; useful in set-
ting $1 to -.
Using + rather than - causes these flags to be turned
off. These flags can also be used upon invocation of the
shell. The current set of flags may be found in $-. The
remaining arguments are positional parameters and are
assigned, in order, to $1, $2, ... If no arguments are
given, the values of all names are printed.
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