$ whatis time

time (7) - overview of time and timers

time (1) - run programs and summarize system resource usage

time (3am) - time functions for gawk

time (2) - get time in seconds

Examples:

1. Use: screen [-opts] [cmd [args]]

   or: screen -r [host.tty]

2. Options:

3. -4 Resolve hostnames only to IPv4 addresses.

4. -6 Resolve hostnames only to IPv6 addresses.

5. -a Force all capabilities into each window's termcap.

6. -A -[r|R] Adapt all windows to the new display width & height.

7. -c file Read configuration file instead of '.screenrc'.

8. -d (-r) Detach the elsewhere running screen (and reattach here).

9. -dmS name Start as daemon: Screen session in detached mode.

10. -D (-r) Detach and logout remote (and reattach here).

11. -D -RR Do whatever is needed to get a screen session.

12. -e xy Change command characters.

13. -f Flow control on, -fn = off, -fa = auto.

14. -h lines Set the size of the scrollback history buffer.

15. -i Interrupt output sooner when flow control is on.

16. -l Login mode on (update /var/run/utmp), -ln = off.

17. -ls [match] or

18. -list Do nothing, just list our SockDir [on possible matches].

19. -L Turn on output logging.

20. -Logfile file Set logfile name.

21. -m ignore $STY variable, do create a new screen session.

22. -O Choose optimal output rather than exact vt100 emulation.

23. -p window Preselect the named window if it exists.

24. -q Quiet startup. Exits with non-zero return code if unsuccessful.

25. -Q Commands will send the response to the stdout of the querying process.

26. -r [session] Reattach to a detached screen process.

27. -R Reattach if possible, otherwise start a new session.

28. -s shell Shell to execute rather than $SHELL.

29. -S sockname Name this session .sockname instead of ...

30. -t title Set title. (window's name).

31. -T term Use term as $TERM for windows, rather than "screen".

32. -U Tell screen to use UTF-8 encoding.

33. -v Print "Screen version 4.06.02 (GNU) 23-Oct-17".

34. -wipe [match] Do nothing, just clean up SockDir [on possible matches].

35. -x Attach to a not detached screen. (Multi display mode).

36. -X Execute as a screen command in the specified session.

37. byobu (1) - wrapper script for seeding a user's byobu configuration and launching a text based window manager ...

38. byobu-screen (1) - Launch byobu with screen as the backend

39. clear (1) - clear the terminal screen

40. figlet (6) - display large characters made up of ordinary screen characters

41. figlet-figlet (6) - display large characters made up of ordinary screen characters

42. mapscrn (8) - load screen output mapping table

43. scr_dump (5) - format of curses screen-dumps.

44. screen (1) - screen manager with VT100/ANSI terminal emulation

45. screendump (1) - dump the contents of a virtual console to stdout

46. setfont (8) - load EGA/VGA console screen font

47. setvesablank (8) - Turn VESA screen blanking on or off

48. showconsolefont (8) - Show the current EGA/VGA console screen font

49. vcstime (8) - Show time in upper right hand corner of the console screen

50. watch (1) - execute a program periodically, showing output fullscreen

51. xdg-screensaver (1) - command line tool for controlling the screensaver

52. xrefresh (1) - refresh all or part of an X screen

53. __ppc_get_timebase (3) - get the current value of the Time Base Register on Power architecture and its frequency.

54. __ppc_get_timebase_freq (3) - get the current value of the Time Base Register on Power architecture and its frequency.

55. a2query (1) - retrieve runtime configuration from a local Apache 2 HTTP server

56. adjtime (3) - correct the time to synchronize the system clock

57. adjtimex (2) - tune kernel clock

58. aio_suspend (3) - wait for asynchronous I/O operation or timeout

59. annotate-output (1) - annotate program output with time and stream

60. asctime (3) - transform date and time to broken-down time or ASCII

61. asctime_r (3) - transform date and time to broken-down time or ASCII

62. bootparam (7) - introduction to boot time parameters of the Linux kernel

63. chrt (1) - manipulate the real-time attributes of a process

64. Class::XSAccessor (3pm) - Generate fast XS accessors without runtime compilation

65. Class::XSAccessor::Array (3pm) - Generate fast XS accessors without runtime compilation

66. clock (3) - determine processor time

67. clock_getcpuclockid (3) - obtain ID of a process CPU-time clock

68. clock_getres (2) - clock and time functions

69. clock_getres (3) - clock and time functions

70. clock_gettime (2) - clock and time functions

71. clock_gettime (3) - clock and time functions

72. clock_settime (2) - clock and time functions

73. clock_settime (3) - clock and time functions

74. ctime (3) - transform date and time to broken-down time or ASCII

75. ctime_r (3) - transform date and time to broken-down time or ASCII

76. date (1) - print or set the system date and time

77. Date::Parse (3pm) - Parse date strings into time values

78. daylight (3) - initialize time conversion information

79. difftime (3) - calculate time difference

80. docker-events (1) - Get real time events from the server

81. docker-system-events (1) - Get real time events from the server

82. unimplemented (2) - unimplemented system calls

83. ftime (3) - return date and time

84. utimensat (2) - change file timestamps with nanosecond precision

85. futimens (3) - change file timestamps with nanosecond precision

86. futimes (3) - change file timestamps

87. futimesat (2) - change timestamps of a file relative to a directory file descriptor

88. getdate (3) - convert a date-plus-time string to broken-down time

89. getdate_err (3) - convert a date-plus-time string to broken-down time

90. getdate_r (3) - convert a date-plus-time string to broken-down time

91. getitimer (2) - get or set value of an interval timer

92. gettimeofday (2) - get / set time

93. gmtime (3) - transform date and time to broken-down time or ASCII

94. gmtime_r (3) - transform date and time to broken-down time or ASCII

95. hwclock (8) - time clocks utility

96. IPC::Run::Timer (3pm) - - Timer channels for IPC::Run.

97. kbdrate (8) - reset the keyboard repeat rate and delay time

98. keep-one-running (1) - run just one instance at a time of some command and unique set of arguments (useful for cronjobs, eg)

99. ldconfig (8) - configure dynamic linker run-time bindings

100. localtime (3) - transform date and time to broken-down time or ASCII

101. localtime (5) - Local timezone configuration file

102. localtime_r (3) - transform date and time to broken-down time or ASCII

103. lutimes (3) - change file timestamps

104. mktime (3) - transform date and time to broken-down time or ASCII

105. Module::Runtime (3pm) - runtime module handling

106. modules (5) - kernel modules to load at boot time

107. mq_timedreceive (2) - receive a message from a message queue

108. mq_timedreceive (3) - receive a message from a message queue

109. mq_timedsend (2) - send a message to a message queue

110. mq_timedsend (3) - send a message to a message queue

111. ntp_adjtime (3) - tune kernel clock

112. ntp_gettime (3) - get time parameters (NTP daemon interface)

113. ntp_gettimex (3) - get time parameters (NTP daemon interface)

114. openssl-s_time (1ssl) - SSL/TLS performance timing program

115. openssl-ts (1ssl) - Time Stamping Authority tool (client/server)

116. openssl-tsget (1ssl) - Time Stamping HTTP/HTTPS client

117. pam_time (8) - PAM module for time control access

118. pam_timestamp (8) - Authenticate using cached successful authentication attempts

119. pam_timestamp_check (8) - Check to see if the default timestamp is valid

120. profil (3) - execution time profile

121. pthread_getcpuclockid (3) - retrieve ID of a thread's CPU time clock

122. pthread_timedjoin_np (3) - try to join with a terminated thread

123. pts-subscribe (1) - time-limited subscription to the PTS

124. pts-unsubscribe (1) - time-limited subscription to the PTS

125. rt_sigtimedwait (2) - synchronously wait for queued signals

126. rtc (4) - real-time clock

127. rtcwake (8) - enter a system sleep state until specified wakeup time

128. rtime (3) - get time from a remote machine

129. run-one (1) - run just one instance at a time of some command and unique set of arguments (useful for cronjobs, eg)

130. run-one-constantly (1) - run just one instance at a time of some command and unique set of arguments (useful for cronjobs...

131. run-one-until-failure (1) - run just one instance at a time of some command and unique set of arguments (useful for cronj...

132. run-one-until-success (1) - run just one instance at a time of some command and unique set of arguments (useful for cronj...

133. run-this-one (1) - run just one instance at a time of some command and unique set of arguments (useful for cronjobs, eg)

134. runc (8) - Open Container Initiative runtime

135. s390_runtime_instr (2) - enable/disable s390 CPU run-time instrumentation

136. s_time (1ssl) - SSL/TLS performance timing program

137. sem_timedwait (3) - lock a semaphore

138. semtimedop (2) - System V semaphore operations

139. setitimer (2) - get or set value of an interval timer

140. settimeofday (2) - get / set time

141. sigtimedwait (2) - synchronously wait for queued signals

142. slabtop (1) - display kernel slab cache information in real time

143. sleep (1) - delay for a specified amount of time

144. stime (2) - set time

145. strftime (3) - format date and time

146. strptime (3) - convert a string representation of time to a time tm structure

147. sysconf (3) - get configuration information at run time

148. sysctl (8) - configure kernel parameters at runtime

149. systemd-debug-generator (8) - Generator for enabling a runtime debug shell and masking specific units at boot

150. systemd-run (1) - Run programs in transient scope units, service units, or path-, socket-, or timer-triggered servic...

151. systemd-timedated (8) - Time and date bus mechanism

152. systemd-timedated.service (8) - Time and date bus mechanism

153. systemd-timesyncd (8) - Network Time Synchronization

154. systemd-timesyncd.service (8) - Network Time Synchronization

155. systemd-tmpfiles-clean.timer (8) - Creates, deletes and cleans up volatile and temporary files and directories

156. systemd.time (7) - Time and date specifications

157. systemd.timer (5) - Timer unit configuration

158. time (1) - run programs and summarize system resource usage

159. time (2) - get time in seconds

160. time (3am) - time functions for gawk

161. time (7) - overview of time and timers

162. time.conf (5) - configuration file for the pam_time module

163. Time::Zone (3pm) - - miscellaneous timezone manipulations routines

164. timedatectl (1) - Control the system time and date

165. timegm (3) - inverses of gmtime and localtime

166. timelocal (3) - inverses of gmtime and localtime

167. timeout (1) - run a command with a time limit

168. timer_create (2) - create a POSIX per-process timer

169. timer_delete (2) - delete a POSIX per-process timer

170. timer_getoverrun (2) - get overrun count for a POSIX per-process timer

171. timer_gettime (2) - arm/disarm and fetch state of POSIX per-process timer

172. timer_settime (2) - arm/disarm and fetch state of POSIX per-process timer

173. timeradd (3) - timeval operations

174. timerclear (3) - timeval operations

175. timercmp (3) - timeval operations

176. timerfd_create (2) - timers that notify via file descriptors

177. timerfd_gettime (2) - timers that notify via file descriptors

178. timerfd_settime (2) - timers that notify via file descriptors

179. timerisset (3) - timeval operations

180. timersub (3) - timeval operations

181. times (2) - get process times

182. timesyncd.conf (5) - Network Time Synchronization configuration files

183. timesyncd.conf.d (5) - Network Time Synchronization configuration files

184. timezone (3) - initialize time conversion information

185. touch (1) - change file timestamps

186. ts (1ssl) - Time Stamping Authority tool (client/server)

187. tsget (1ssl) - Time Stamping HTTP/HTTPS client

188. tzfile (5) - timezone information

189. tzname (3) - initialize time conversion information

190. tzselect (1) - view timezones

191. tzselect (8) - select a timezone

192. tzset (3) - initialize time conversion information

193. uptime (1) - Tell how long the system has been running.

194. utime (2) - change file last access and modification times

195. utimes (2) - change file last access and modification times

196. vcstime (8) - Show time in upper right hand corner of the console screen

197. vtimes (3) - get resource usage

198. xfs_rtcp (8) - XFS realtime copy command

199. zdump (8) - timezone dumper

200. zic (8) - timezone compiler

Please click on " man time " to see the Manual Page for this command.