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SYSTEMD.INDEX

NAME
B
C
D
H
I
J
K
L
M
N
O
P
R
S
T
U
V
SEE ALSO

NAME

systemd.index − List all manpages from the systemd project

B

binfmt.d(5) −− Configure additional binary formats for executables at boot
bootchart.conf(5) −− Boot performance analysis graphing tool configuration file
bootctl(1) −− Control the firmware and boot manager settings
bootup(7) −− System bootup process
busctl(1) −− Introspect the bus

C

crypttab(5) −− Configuration for encrypted block devices

D

daemon(7) −− Writing and packaging system daemons

H

halt(8) −− Halt, power−off or reboot the machine
hostname(5) −− Local hostname configuration file
hostnamectl(1) −− Control the system hostname

I

init(1) −− systemd system and service manager

J

journalctl(1) −− Query the systemd journal
journald.conf(5) −− Journal service configuration file

K

kernel-command-line(7) −− Kernel command line parameters
kernel-install(8) −− Add and remove kernel and initramfs images to and from /boot

L

locale.conf(5) −− Configuration file for locale settings
localectl(1) −− Control the system locale and keyboard layout settings
localtime(5) −− Local timezone configuration file
loginctl(1) −− Control the systemd login manager
logind.conf(5) −− Login manager configuration file

M

machine-id(5) −− Local machine ID configuration file
machine-info(5) −− Local machine information file
machinectl(1) −− Control the systemd machine manager
modules-load.d(5) −− Configure kernel modules to load at boot

N

nss-myhostname(8) −− Provide hostname resolution for the locally configured system hostname.

O

os-release(5) −− Operating system identification

P

pam_systemd(8) −− Register user sessions in the systemd login manager
poweroff(8) −− Halt, power−off or reboot the machine

R

reboot(8) −− Halt, power−off or reboot the machine
runlevel(8) −− Print previous and current SysV runlevel

S

sd-daemon(3) −− APIs for new−style daemons
sd-id128(3) −− APIs for processing 128−bit IDs
sd-journal(3) −− APIs for submitting and querying log entries to and from the journal
sd-login(3) −− APIs for tracking logins
sd-readahead(3) −− Reference implementation of APIs for controlling boot−time read−ahead
SD_ALERT(3) −− APIs for new−style daemons
sd_booted(3) −− Test whether the system is running the systemd init system
sd_bus_creds_get_audit_login_uid(3) −− Retrieve fields from a credentials object
sd_bus_creds_get_audit_session_id(3) −− Retrieve fields from a credentials object
sd_bus_creds_get_cgroup(3) −− Retrieve fields from a credentials object
sd_bus_creds_get_cmdline(3) −− Retrieve fields from a credentials object
sd_bus_creds_get_comm(3) −− Retrieve fields from a credentials object
sd_bus_creds_get_exe(3) −− Retrieve fields from a credentials object
sd_bus_creds_get_gid(3) −− Retrieve fields from a credentials object
sd_bus_creds_get_mask(3) −− Retrieve credentials object for the specified PID
sd_bus_creds_get_owner_uid(3) −− Retrieve fields from a credentials object
sd_bus_creds_get_pid(3) −− Retrieve fields from a credentials object
sd_bus_creds_get_pid_starttime(3) −− Retrieve fields from a credentials object
sd_bus_creds_get_selinux_context(3) −− Retrieve fields from a credentials object
sd_bus_creds_get_session(3) −− Retrieve fields from a credentials object
sd_bus_creds_get_slice(3) −− Retrieve fields from a credentials object
sd_bus_creds_get_tid(3) −− Retrieve fields from a credentials object
sd_bus_creds_get_tid_comm(3) −− Retrieve fields from a credentials object
sd_bus_creds_get_uid(3) −− Retrieve fields from a credentials object
sd_bus_creds_get_unique_name(3) −− Retrieve fields from a credentials object
sd_bus_creds_get_unit(3) −− Retrieve fields from a credentials object
sd_bus_creds_get_user_unit(3) −− Retrieve fields from a credentials object
sd_bus_creds_get_well_known_names(3) −− Retrieve fields from a credentials object
sd_bus_creds_has_bounding_cap(3) −− Retrieve fields from a credentials object
sd_bus_creds_has_effective_cap(3) −− Retrieve fields from a credentials object
sd_bus_creds_has_inheritable_cap(3) −− Retrieve fields from a credentials object
sd_bus_creds_has_permitted_cap(3) −− Retrieve fields from a credentials object
sd_bus_creds_new_from_pid(3) −− Retrieve credentials object for the specified PID
sd_bus_creds_ref(3) −− Retrieve credentials object for the specified PID
sd_bus_creds_unref(3) −− Retrieve credentials object for the specified PID
sd_bus_default_system(3) −− Open a connection to the system or user bus
sd_bus_default_user(3) −− Open a connection to the system or user bus
sd_bus_error(3) −− sd−bus error handling
sd_bus_error_copy(3) −− sd−bus error handling
sd_bus_error_free(3) −− sd−bus error handling
sd_bus_error_get_errno(3) −− sd−bus error handling
sd_bus_error_has_name(3) −− sd−bus error handling
sd_bus_error_is_set(3) −− sd−bus error handling
sd_bus_error_set(3) −− sd−bus error handling
sd_bus_error_set_const(3) −− sd−bus error handling
sd_bus_error_set_errno(3) −− sd−bus error handling
sd_bus_error_set_errnof(3) −− sd−bus error handling
sd_bus_label_escape(3) −− Escape D−Bus object path special characters
sd_bus_label_unescape(3) −− Escape D−Bus object path special characters
sd_bus_message_get_cookie(3) −− Returns the transaction cookie of a message
sd_bus_message_get_monotonic_usec(3) −− Retrieve the sender timestamps and sequence number of a message
sd_bus_message_get_realtime_usec(3) −− Retrieve the sender timestamps and sequence number of a message
sd_bus_message_get_reply_cookie(3) −− Returns the transaction cookie of a message
sd_bus_message_get_seqnum(3) −− Retrieve the sender timestamps and sequence number of a message
sd_bus_new(3) −− Create a new bus object and create or destroy references to it
sd_bus_open_system(3) −− Open a connection to the system or user bus
sd_bus_open_system_container(3) −− Open a connection to the system or user bus
sd_bus_open_system_remote(3) −− Open a connection to the system or user bus
sd_bus_open_user(3) −− Open a connection to the system or user bus
sd_bus_ref(3) −− Create a new bus object and create or destroy references to it
sd_bus_release_name(3) −− Request or release a well−known name on a bus
sd_bus_request_name(3) −− Request or release a well−known name on a bus
sd_bus_unref(3) −− Create a new bus object and create or destroy references to it
SD_CRIT(3) −− APIs for new−style daemons
SD_DEBUG(3) −− APIs for new−style daemons
SD_EMERG(3) −− APIs for new−style daemons
SD_ERR(3) −− APIs for new−style daemons
sd_get_machine_names(3) −− Determine available seats, sessions, logged in users and virtual machines/containers
sd_get_seats(3) −− Determine available seats, sessions, logged in users and virtual machines/containers
sd_get_sessions(3) −− Determine available seats, sessions, logged in users and virtual machines/containers
sd_get_uids(3) −− Determine available seats, sessions, logged in users and virtual machines/containers
SD_ID128_CONST_STR(3) −− APIs for processing 128−bit IDs
sd_id128_equal(3) −− APIs for processing 128−bit IDs
SD_ID128_FORMAT_STR(3) −− APIs for processing 128−bit IDs
SD_ID128_FORMAT_VAL(3) −− APIs for processing 128−bit IDs
sd_id128_from_string(3) −− Format or parse 128−bit IDs as strings
sd_id128_get_boot(3) −− Retrieve 128−bit IDs
sd_id128_get_machine(3) −− Retrieve 128−bit IDs
SD_ID128_MAKE(3) −− APIs for processing 128−bit IDs
sd_id128_randomize(3) −− Generate 128−bit IDs
sd_id128_t(3) −− APIs for processing 128−bit IDs
sd_id128_to_string(3) −− Format or parse 128−bit IDs as strings
SD_INFO(3) −− APIs for new−style daemons
sd_is_fifo(3) −− Check the type of a file descriptor
sd_is_mq(3) −− Check the type of a file descriptor
sd_is_socket(3) −− Check the type of a file descriptor
sd_is_socket_inet(3) −− Check the type of a file descriptor
sd_is_socket_unix(3) −− Check the type of a file descriptor
sd_is_special(3) −− Check the type of a file descriptor
sd_journal(3) −− Open the system journal for reading
sd_journal_add_conjunction(3) −− Add or remove entry matches
sd_journal_add_disjunction(3) −− Add or remove entry matches
sd_journal_add_match(3) −− Add or remove entry matches
SD_JOURNAL_APPEND(3) −− Journal change notification interface
sd_journal_close(3) −− Open the system journal for reading
SD_JOURNAL_CURRENT_USER(3) −− Open the system journal for reading
sd_journal_enumerate_data(3) −− Read data fields from the current journal entry
sd_journal_enumerate_unique(3) −− Read unique data fields from the journal
sd_journal_flush_matches(3) −− Add or remove entry matches
SD_JOURNAL_FOREACH(3) −− Advance or set back the read pointer in the journal
SD_JOURNAL_FOREACH_BACKWARDS(3) −− Advance or set back the read pointer in the journal
SD_JOURNAL_FOREACH_DATA(3) −− Read data fields from the current journal entry
SD_JOURNAL_FOREACH_UNIQUE(3) −− Read unique data fields from the journal
sd_journal_get_catalog(3) −− Retrieve message catalog entry
sd_journal_get_catalog_for_message_id(3) −− Retrieve message catalog entry
sd_journal_get_cursor(3) −− Get cursor string for or test cursor string against the current journal entry
sd_journal_get_cutoff_monotonic_usec(3) −− Read cut−off timestamps from the current journal entry
sd_journal_get_cutoff_realtime_usec(3) −− Read cut−off timestamps from the current journal entry
sd_journal_get_data(3) −− Read data fields from the current journal entry
sd_journal_get_data_threshold(3) −− Read data fields from the current journal entry
sd_journal_get_events(3) −− Journal change notification interface
sd_journal_get_fd(3) −− Journal change notification interface
sd_journal_get_monotonic_usec(3) −− Read timestamps from the current journal entry
sd_journal_get_realtime_usec(3) −− Read timestamps from the current journal entry
sd_journal_get_timeout(3) −− Journal change notification interface
sd_journal_get_usage(3) −− Journal disk usage
SD_JOURNAL_INVALIDATE(3) −− Journal change notification interface
SD_JOURNAL_LOCAL_ONLY(3) −− Open the system journal for reading
sd_journal_next(3) −− Advance or set back the read pointer in the journal
sd_journal_next_skip(3) −− Advance or set back the read pointer in the journal
SD_JOURNAL_NOP(3) −− Journal change notification interface
sd_journal_open(3) −− Open the system journal for reading
sd_journal_open_container(3) −− Open the system journal for reading
sd_journal_open_directory(3) −− Open the system journal for reading
sd_journal_open_files(3) −− Open the system journal for reading
sd_journal_perror(3) −− Submit log entries to the journal
sd_journal_previous(3) −− Advance or set back the read pointer in the journal
sd_journal_previous_skip(3) −− Advance or set back the read pointer in the journal
sd_journal_print(3) −− Submit log entries to the journal
sd_journal_printv(3) −− Submit log entries to the journal
sd_journal_process(3) −− Journal change notification interface
sd_journal_query_unique(3) −− Read unique data fields from the journal
sd_journal_reliable_fd(3) −− Journal change notification interface
sd_journal_restart_data(3) −− Read data fields from the current journal entry
sd_journal_restart_unique(3) −− Read unique data fields from the journal
SD_JOURNAL_RUNTIME_ONLY(3) −− Open the system journal for reading
sd_journal_seek_cursor(3) −− Seek to a position in the journal
sd_journal_seek_head(3) −− Seek to a position in the journal
sd_journal_seek_monotonic_usec(3) −− Seek to a position in the journal
sd_journal_seek_realtime_usec(3) −− Seek to a position in the journal
sd_journal_seek_tail(3) −− Seek to a position in the journal
sd_journal_send(3) −− Submit log entries to the journal
sd_journal_sendv(3) −− Submit log entries to the journal
sd_journal_set_data_threshold(3) −− Read data fields from the current journal entry
sd_journal_stream_fd(3) −− Create log stream file descriptor to the journal
SD_JOURNAL_SUPPRESS_LOCATION(3) −− Submit log entries to the journal
SD_JOURNAL_SYSTEM(3) −− Open the system journal for reading
sd_journal_test_cursor(3) −− Get cursor string for or test cursor string against the current journal entry
sd_journal_wait(3) −− Journal change notification interface
sd_listen_fds(3) −− Check for file descriptors passed by the system manager
SD_LISTEN_FDS_START(3) −− Check for file descriptors passed by the system manager
sd_login_monitor(3) −− Monitor login sessions, seats, users and virtual machines/containers
sd_login_monitor_flush(3) −− Monitor login sessions, seats, users and virtual machines/containers
sd_login_monitor_get_events(3) −− Monitor login sessions, seats, users and virtual machines/containers
sd_login_monitor_get_fd(3) −− Monitor login sessions, seats, users and virtual machines/containers
sd_login_monitor_get_timeout(3) −− Monitor login sessions, seats, users and virtual machines/containers
sd_login_monitor_new(3) −− Monitor login sessions, seats, users and virtual machines/containers
sd_login_monitor_unref(3) −− Monitor login sessions, seats, users and virtual machines/containers
SD_NOTICE(3) −− APIs for new−style daemons
sd_notify(3) −− Notify service manager about start−up completion and other daemon status changes
sd_notifyf(3) −− Notify service manager about start−up completion and other daemon status changes
sd_pid_get_machine_name(3) −− Determine session, service, owner of a session, container/VM or slice of a specific PID
sd_pid_get_owner_uid(3) −− Determine session, service, owner of a session, container/VM or slice of a specific PID
sd_pid_get_session(3) −− Determine session, service, owner of a session, container/VM or slice of a specific PID
sd_pid_get_slice(3) −− Determine session, service, owner of a session, container/VM or slice of a specific PID
sd_pid_get_unit(3) −− Determine session, service, owner of a session, container/VM or slice of a specific PID
sd_pid_get_user_unit(3) −− Determine session, service, owner of a session, container/VM or slice of a specific PID
sd_readahead(3) −− Control ongoing disk boot−time read−ahead operations
sd_seat_can_graphical(3) −− Determine state of a specific seat
sd_seat_can_multi_session(3) −− Determine state of a specific seat
sd_seat_can_tty(3) −− Determine state of a specific seat
sd_seat_get_active(3) −− Determine state of a specific seat
sd_seat_get_sessions(3) −− Determine state of a specific seat
sd_session_get_class(3) −− Determine state of a specific session
sd_session_get_display(3) −− Determine state of a specific session
sd_session_get_remote_host(3) −− Determine state of a specific session
sd_session_get_remote_user(3) −− Determine state of a specific session
sd_session_get_seat(3) −− Determine state of a specific session
sd_session_get_service(3) −− Determine state of a specific session
sd_session_get_state(3) −− Determine state of a specific session
sd_session_get_tty(3) −− Determine state of a specific session
sd_session_get_type(3) −− Determine state of a specific session
sd_session_get_uid(3) −− Determine state of a specific session
sd_session_get_vt(3) −− Determine state of a specific session
sd_session_is_active(3) −− Determine state of a specific session
sd_session_is_remote(3) −− Determine state of a specific session
sd_uid_get_seats(3) −− Determine login state of a specific Unix user ID
sd_uid_get_sessions(3) −− Determine login state of a specific Unix user ID
sd_uid_get_state(3) −− Determine login state of a specific Unix user ID
sd_uid_is_on_seat(3) −− Determine login state of a specific Unix user ID
SD_WARNING(3) −− APIs for new−style daemons
sd_watchdog_enabled(3) −− Check whether the service manager expects watchdog keep−alive notifications from a service
shutdown(8) −− Halt, power−off or reboot the machine
sysctl.d(5) −− Configure kernel parameters at boot
systemctl(1) −− Control the systemd system and service manager
systemd(1) −− systemd system and service manager
systemd-activate(8) −− Test socket activation of daemons
systemd-analyze(1) −− Analyze system boot−up performance
systemd-ask-password(1) −− Query the user for a system password
systemd-ask-password-console.path(8) −− Query the user for system passwords on the console and via wall
systemd-ask-password-console.service(8) −− Query the user for system passwords on the console and via wall
systemd-ask-password-wall.path(8) −− Query the user for system passwords on the console and via wall
systemd-ask-password-wall.service(8) −− Query the user for system passwords on the console and via wall
systemd-backlight(8) −− Load and save the display backlight brightness at boot and shutdown
systemd-backlight@.service(8) −− Load and save the display backlight brightness at boot and shutdown
systemd-binfmt(8) −− Configure additional binary formats for executables at boot
systemd-binfmt.service(8) −− Configure additional binary formats for executables at boot
systemd-bootchart(1) −− Boot performance graphing tool
systemd-bus-proxyd(8) −− Connect STDIO or a socket to a given bus address
systemd-bus-proxyd.socket(8) −− Proxy classic D−Bus clients to kdbus
systemd-bus-proxyd@.service(8) −− Proxy classic D−Bus clients to kdbus
systemd-cat(1) −− Connect a pipeline or program's output with the journal
systemd-cgls(1) −− Recursively show control group contents
systemd-cgtop(1) −− Show top control groups by their resource usage
systemd-coredumpctl(1) −− Retrieve coredumps from the journal
systemd-cryptsetup(8) −− Full disk decryption logic
systemd-cryptsetup-generator(8) −− Unit generator for
systemd-cryptsetup@.service(8) −− Full disk decryption logic
systemd-delta(1) −− Find overridden configuration files
systemd-detect-virt(1) −− Detect execution in a virtualized environment
systemd-efi-boot-generator(8) −− Generator for automatically mounting the EFI System Partition used by the current boot to
systemd-fsck(8) −− File system checker logic
systemd-fsck-root.service(8) −− File system checker logic
systemd-fsck@.service(8) −− File system checker logic
systemd-fstab-generator(8) −− Unit generator for /etc/fstab
systemd-getty-generator(8) −− Generator for enabling getty instances on the console
systemd-gpt-auto-generator(8) −− Generator for automatically discovering and mounting
systemd-halt.service(8) −− System shutdown logic
systemd-hibernate.service(8) −− System sleep state logic
systemd-hostnamed(8) −− Host name bus mechanism
systemd-hostnamed.service(8) −− Host name bus mechanism
systemd-hybrid-sleep.service(8) −− System sleep state logic
systemd-inhibit(1) −− Execute a program with an inhibition lock taken
systemd-initctl(8) −− /dev/initctl compatibility
systemd-initctl.service(8) −− /dev/initctl compatibility
systemd-initctl.socket(8) −− /dev/initctl compatibility
systemd-journal-gatewayd(8) −− HTTP server for journal events
systemd-journal-gatewayd.service(8) −− HTTP server for journal events
systemd-journal-gatewayd.socket(8) −− HTTP server for journal events
systemd-journald(8) −− Journal service
systemd-journald.service(8) −− Journal service
systemd-journald.socket(8) −− Journal service
systemd-kexec.service(8) −− System shutdown logic
systemd-localed(8) −− Locale bus mechanism
systemd-localed.service(8) −− Locale bus mechanism
systemd-logind(8) −− Login manager
systemd-logind.service(8) −− Login manager
systemd-machine-id-setup(1) −− Initialize the machine ID in /etc/machine−id
systemd-machined(8) −− Virtual machine and container registration manager
systemd-machined.service(8) −− Virtual machine and container registration manager
systemd-modules-load(8) −− Configure kernel modules to load at boot
systemd-modules-load.service(8) −− Configure kernel modules to load at boot
systemd-networkd(8) −− Network manager
systemd-networkd.service(8) −− Network manager
systemd-notify(1) −− Notify service manager about start−up completion and other daemon status changes
systemd-nspawn(1) −− Spawn a namespace container for debugging, testing and building
systemd-poweroff.service(8) −− System shutdown logic
systemd-quotacheck(8) −− File system quota checker logic
systemd-quotacheck.service(8) −− File system quota checker logic
systemd-random-seed(8) −− Load and save the system random seed at boot and shutdown
systemd-random-seed.service(8) −− Load and save the system random seed at boot and shutdown
systemd-readahead(8) −− Disk read ahead logic
systemd-readahead-collect.service(8) −− Disk read ahead logic
systemd-readahead-done.service(8) −− Disk read ahead logic
systemd-readahead-done.timer(8) −− Disk read ahead logic
systemd-readahead-replay.service(8) −− Disk read ahead logic
systemd-reboot.service(8) −− System shutdown logic
systemd-remount-fs(8) −− Remount root and kernel file systems
systemd-remount-fs.service(8) −− Remount root and kernel file systems
systemd-rfkill(8) −− Load and save the RF kill switch state at boot and shutdown
systemd-rfkill@.service(8) −− Load and save the RF kill switch state at boot and shutdown
systemd-run(1) −− Run programs in transient scope or service units
systemd-shutdown(8) −− System shutdown logic
systemd-shutdownd(8) −− Scheduled shutdown service
systemd-shutdownd.service(8) −− Scheduled shutdown service
systemd-shutdownd.socket(8) −− Scheduled shutdown service
systemd-sleep(8) −− System sleep state logic
systemd-sleep.conf(5) −− Suspend and hibernation configuration file
systemd-socket-proxyd(8) −− Bidirectionally proxy local sockets to another (possibly remote) socket.
systemd-suspend.service(8) −− System sleep state logic
systemd-sysctl(8) −− Configure kernel parameters at boot
systemd-sysctl.service(8) −− Configure kernel parameters at boot
systemd-system-update-generator(8) −− Generator for redirecting boot to offline update mode
systemd-system.conf(5) −− System and session service manager configuration file
systemd-timedated(8) −− Time and date bus mechanism
systemd-timedated.service(8) −− Time and date bus mechanism
systemd-tmpfiles(8) −− Creates, deletes and cleans up volatile and temporary files and directories
systemd-tmpfiles-clean.service(8) −− Creates, deletes and cleans up volatile and temporary files and directories
systemd-tmpfiles-clean.timer(8) −− Creates, deletes and cleans up volatile and temporary files and directories
systemd-tmpfiles-setup-dev.service(8) −− Creates, deletes and cleans up volatile and temporary files and directories
systemd-tmpfiles-setup.service(8) −− Creates, deletes and cleans up volatile and temporary files and directories
systemd-tty-ask-password-agent(1) −− List or process pending systemd password requests
systemd-udevd(8) −− Device event managing daemon
systemd-udevd-control.socket(8) −− Device event managing daemon
systemd-udevd-kernel.socket(8) −− Device event managing daemon
systemd-udevd.service(8) −− Device event managing daemon
systemd-update-utmp(8) −− Write audit and utmp updates at bootup, runlevel changes and shutdown
systemd-update-utmp-runlevel.service(8) −− Write audit and utmp updates at bootup, runlevel changes and shutdown
systemd-update-utmp.service(8) −− Write audit and utmp updates at bootup, runlevel changes and shutdown
systemd-user-sessions(8) −− Permit user logins after boot, prohibit user logins at shutdown
systemd-user-sessions.service(8) −− Permit user logins after boot, prohibit user logins at shutdown
systemd-user.conf(5) −− System and session service manager configuration file
systemd-vconsole-setup(8) −− Configure the virtual console at boot
systemd-vconsole-setup.service(8) −− Configure the virtual console at boot
systemd.automount(5) −− Automount unit configuration
systemd.device(5) −− Device unit configuration
systemd.directives(7) −− Index of configuration directives
systemd.exec(5) −− Execution environment configuration
systemd.journal-fields(7) −− Special journal fields
systemd.kill(5) −− Process killing procedure configuration
systemd.mount(5) −− Mount unit configuration
systemd.path(5) −− Path unit configuration
systemd.preset(5) −− Service enablement presets
systemd.resource-control(5) −− Resource control unit settings
systemd.scope(5) −− Scope unit configuration
systemd.service(5) −− Service unit configuration
systemd.slice(5) −− Slice unit configuration
systemd.snapshot(5) −− Snapshot unit configuration
systemd.socket(5) −− Socket unit configuration
systemd.special(7) −− Special systemd units
systemd.swap(5) −− Swap unit configuration
systemd.target(5) −− Target unit configuration
systemd.time(7) −− Time and date specifications
systemd.timer(5) −− Timer unit configuration
systemd.unit(5) −− Unit configuration

T

telinit(8) −− Change SysV runlevel
timedatectl(1) −− Control the system time and date
tmpfiles.d(5) −− Configuration for creation, deletion and cleaning of volatile and temporary files

U

udev(7) −− Dynamic device management
udevadm(8) −− udev management tool

V

vconsole.conf(5) −− Configuration file for the virtual console

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Free Software

Free Software provides computer programs and capabilities at no cost but more importantly, it provides the freedom to run, edit, contribute to, and share the software. The importance of free software is a matter of access, not price. Software at no cost is a benefit but ownership rights to the software and source code is far more significant.

Free Office Software - The Libre Office suite provides top desktop productivity tools for free. This includes, a word processor, spreadsheet, presentation engine, drawing and flowcharting, database and math applications. Libre Office is available for Linux or Windows.

Free Books

The Free Books Library is a collection of thousands of the most popular public domain books in an online readable format. The collection includes great classical literature and more recent works where the U.S. copyright has expired. These books are yours to read and use without restrictions.

Source Code - Want to change a program or know how it works? Open Source provides the source code for its programs so that anyone can use, modify or learn how to write those programs themselves. Visit the GNU source code repositories to download the source.

Education

Study at Harvard, Stanford or MIT - Open edX provides free online courses from Harvard, MIT, Columbia, UC Berkeley and other top Universities. Hundreds of courses for almost all major subjects and course levels. Open edx also offers some paid courses and selected certifications.

Linux Manual Pages - A man or manual page is a form of software documentation found on Linux/Unix operating systems. Topics covered include computer programs (including library and system calls), formal standards and conventions, and even abstract concepts.