BF_options (3ssl)    - Blowfish encryption
btrfs (5)            - mount options and supported file attributes for the bt...
ccw_device_clear_options (9) - clear some options
ccw_device_set_options (9) - set some options
ccw_device_set_options_mask (9) - set some options and unset the rest
dhcp-options (5)     - Dynamic Host Configuration Protocol options
Dpkg::BuildOptions (3) - parse and update build options
ExtUtils::Mksymlists (3perl) - write linker options files for dynamic extension
get_options (9)      - Parse a string into a list of integers
getopt (1)           - parse command options (enhanced)
getopt (3)           - Parse command-line options
Getopt::Long (3perl) - Extended processing of command line options
getopt_long (3)      - Parse command-line options
getopt_long_only (3) - Parse command-line options
getsockopt (2)       - get and set options on sockets
git-config (1)       - Get and set repository or global options
GnuPG::Options (3pm) - GnuPG options embodiment
grog (1)             - guess options for groff command
gtk-options (7)      - Standard Command Line Options for GTK+ Programs
hosts_options (5)    - host access control language extensions
my_print_defaults (1) - display options from option files
optarg (3)           - Parse command-line options
opterr (3)           - Parse command-line options
optind (3)           - Parse command-line options
optopt (3)           - Parse command-line options
php-config (1)       - get information about PHP configuration and compile op...
php-config5 (1)      - get information about PHP configuration and compile op...
posixoptions (7)     - optional parts of the POSIX standard
setsockopt (2)       - get and set options on sockets
shtool-slo (1)       - GNU shtool separate linker options by library class
SSL_clear_options (3ssl) - manipulate SSL options
SSL_CTX_clear_options (3ssl) - manipulate SSL options
SSL_CTX_get_options (3ssl) - manipulate SSL options
SSL_CTX_set_options (3ssl) - manipulate SSL options
SSL_get_options (3ssl) - manipulate SSL options
SSL_get_secure_renegotiation_support (3ssl) - manipulate SSL options
SSL_set_options (3ssl) - manipulate SSL options
uart_parse_earlycon (9) - Parse earlycon options
uart_parse_options (9) - Parse serial port baud/parity/bits/flow control.
uart_set_options (9) - setup the serial console parameters
w1_post_write (9)    - post-write options
xfs (5)              - layout and mount options for the XFS filesystem
Xsession.options (5) - configuration options for Xsession (5)
Xwrapper.config (5)  - configuration options for X server wrapper
zshoptions (1)       - zsh options