used.(1) - phpMan

Test2::API::Instance (3pm) - Object used by Test2::API under the hood
Test2::Hub::Interceptor (3pm) - Hub used by interceptor to grab results.
Test2::Hub::Interceptor::Terminator (3pm) - Exception class used by Test2::Hu...
Test2::Hub::Subtest (3pm) - Hub used by subtests
Test2::Util (3pm)    - Tools used by Test2 and friends.
Encode::MIME::Name (3pm) - - internally used by Encode
B::Showlex (3pm)     - Show lexical variables used in functions or files
CGI::Util (3pm)      - Internal utilities used by CGI module
crontab (5)          - files used to schedule the execution of programs
db_archive (1)       - Find unused log files for archival
dbus-update-activation-environment (1) - update environment used for D-Bus se...
deallocvt (1)        - deallocate unused virtual consoles
Encode::CJKConstants (3pm) - - Internally used by Encode::??::ISO_2022_*
Encode::CN::HZ (3pm) - - internally used by Encode::CN
Encode::Config (3pm) - - internally used by Encode
Encode::JP::H2Z (3pm) - - internally used by Encode::JP::2022_JP*
Encode::JP::JIS7 (3pm) - - internally used by Encode::JP
Encode::KR::2022_KR (3pm) - - internally used by Encode::KR
ExtUtils::MM_Unix (3pm) - methods used by ExtUtils::MakeMaker
ExtUtils::ParseXS::Utilities (3pm) - Subroutines used with ExtUtils::ParseXS
free (1)             - Display amount of free and used memory in the system
fstrim (8)           - discard unused blocks on a mounted filesystem
githooks (5)         - Hooks used by Git
grubby (8)           - command line tool used to configure bootloader menu en...
libxml (3)           - library used to parse XML files
lvmdiskscan (8)      - List devices that may be used as physical volumes
Net::Cmd (3pm)       - Network Command class (as used by FTP, SMTP etc)
program_invocation_name (3) - obtain name used to invoke calling program
program_invocation_short_name (3) - obtain name used to invoke calling program
selabel_x (5)        - userspace SELinux labeling interface and configuration...
selinuxenabled (8)   - tool to be used within shell scripts to determine if s...
selinuxexeccon (8)   - report SELinux context used for this executable
setfsgid (2)         - set group identity used for file system checks
setfsgid32 (2)       - set group identity used for file system checks
setfsuid (2)         - set user identity used for file system checks
setfsuid32 (2)       - set user identity used for file system checks
smime_keys (1)       - Utility to add S/MIME certificate to the internal data...
spamassassin (1)     - extensible email filter used to identify spam
systemd-efi-boot-generator (8) - Generator for automatically mounting the EFI...
Time::tm (3pm)       - internal object used by Time::gmtime and Time::localtime
x_contexts (5)       - userspace SELinux labeling interface and configuration...