only.(2) - phpMan

aria_pack (1)        - generate compressed, read-only Aria tables
AutoLoader (3pm)     - load subroutines only on demand
doveadm-altmove (1)  - Move matching mails to the alternative storage (dbox-o...
git-shell (1)        - Restricted login shell for Git-only SSH access
grub2-reboot (8)     - Set the default boot menu entry for the next boot only.
myisampack (1)       - generate compressed, read-only MyISAM tables
pam_rootok (8)       - Gain only root access
pam_wheel (8)        - Only permit root access to members of group wheel
readonly (1p)        - set the readonly attribute for variables
SelfLoader (3pm)     - load functions only on demand
Thread (3pm)         - Manipulate threads in Perl (for old code only)