Linux常用命令使用格式

1 Usage: date [OPTION]... [+FORMAT]
2 or: date [-u|--utc|--universal] [MMDDhhmm[[CC]YY][.ss]]
3 Display the current time in the given FORMAT, or set the system date.
4
5 Mandatory arguments to long options are mandatory for short options too.
6 -d, --date=STRING display time described by STRING, not ‘now‘
7 -f, --file=DATEFILE like --date once for each line of DATEFILE
8 -I[TIMESPEC], --iso-8601[=TIMESPEC] output date/time in ISO 8601 format.
9 TIMESPEC=‘date‘ for date only (the default),
10 ‘hours‘, ‘minutes‘, ‘seconds‘, or ‘ns‘ for date
11 and time to the indicated precision.
12 -r, --reference=FILE display the last modification time of FILE
13 -R, --rfc-2822 output date and time in RFC 2822 format.
14 Example: Mon, 07 Aug 2006 12:34:56 -0600
15 --rfc-3339=TIMESPEC output date and time in RFC 3339 format.
16 TIMESPEC=‘date‘, ‘seconds‘, or ‘ns‘ for
17 date and time to the indicated precision.
18 Date and time components are separated by
19 a single space: 2006-08-07 12:34:56-06:00
20 -s, --set=STRING set time described by STRING
21 -u, --utc, --universal print or set Coordinated Universal Time (UTC)
22 --help display this help and exit
23 --version output version information and exit
24
25 FORMAT controls the output. Interpreted sequences are:
26
27 %% a literal %
28 %a locale‘s abbreviated weekday name (e.g., Sun)
29 %A locale‘s full weekday name (e.g., Sunday)
30 %b locale‘s abbreviated month name (e.g., Jan)
31 %B locale‘s full month name (e.g., January)
32 %c locale‘s date and time (e.g., Thu Mar 3 23:05:25 2005)
33 %C century; like %Y, except omit last two digits (e.g., 20)
34 %d day of month (e.g., 01)
35 %D date; same as %m/%d/%y
36 %e day of month, space padded; same as %_d
37 %F full date; same as %Y-%m-%d
38 %g last two digits of year of ISO week number (see %G)
39 %G year of ISO week number (see %V); normally useful only with %V
40 %h same as %b
41 %H hour (00..23)
42 %I hour (01..12)
43 %j day of year (001..366)
44 %k hour, space padded ( 0..23); same as %_H
45 %l hour, space padded ( 1..12); same as %_I
46 %m month (01..12)
47 %M minute (00..59)
48 %n a newline
49 %N nanoseconds (000000000..999999999)
50 %p locale‘s equivalent of either AM or PM; blank if not known
51 %P like %p, but lower case
52 %r locale‘s 12-hour clock time (e.g., 11:11:04 PM)
53 %R 24-hour hour and minute; same as %H:%M
54 %s seconds since 1970-01-01 00:00:00 UTC
55 %S second (00..60)
56 %t a tab
57 %T time; same as %H:%M:%S
58 %u day of week (1..7); 1 is Monday
59 %U week number of year, with Sunday as first day of week (00..53)
60 %V ISO week number, with Monday as first day of week (01..53)
61 %w day of week (0..6); 0 is Sunday
62 %W week number of year, with Monday as first day of week (00..53)
63 %x locale‘s date representation (e.g., 12/31/99)
64 %X locale‘s time representation (e.g., 23:13:48)
65 %y last two digits of year (00..99)
66 %Y year
67 %z +hhmm numeric time zone (e.g., -0400)
68 %:z +hh:mm numeric time zone (e.g., -04:00)
69 %::z +hh:mm:ss numeric time zone (e.g., -04:00:00)
70 %:::z numeric time zone with : to necessary precision (e.g., -04, +05:30)
71 %Z alphabetic time zone abbreviation (e.g., EDT)
72
73 By default, date pads numeric fields with zeroes.
74 The following optional flags may follow ‘%‘:
75
76 - (hyphen) do not pad the field
77 _ (underscore) pad with spaces
78 0 (zero) pad with zeros
79 ^ use upper case if possible
80 # use opposite case if possible
81
82 After any flags comes an optional field width, as a decimal number;
83 then an optional modifier, which is either
84 E to use the locale‘s alternate representations if available, or
85 O to use the locale‘s alternate numeric symbols if available.
86
87 Examples:
88 Convert seconds since the epoch (1970-01-01 UTC) to a date
89 $ date --date=‘@2147483647‘
90
91 Show the time on the west coast of the US (use tzselect(1) to find TZ)
92 $ TZ=‘America/Los_Angeles‘ date
93
94 Show the local time for 9AM next Friday on the west coast of the US
95 $ date --date=‘TZ="America/Los_Angeles" 09:00 next Fri‘
96
97 GNU coreutils online help: //www.gnu.org/software/coreutils/>
98 For complete documentation, run: info coreutils ‘date invocation‘

1 Use: screen [-opts] [cmd [args]]
2 or: screen -r [host.tty]
3
4 Options:
5 -4 Resolve hostnames only to IPv4 addresses.
6 -6 Resolve hostnames only to IPv6 addresses.
7 -a Force all capabilities into each window‘s termcap.
8 -A -[r|R] Adapt all windows to the new display width & height.
9 -c file Read configuration file instead of ‘.screenrc‘.
10 -d (-r) Detach the elsewhere running screen (and reattach here).
11 -dmS name Start as daemon: Screen session in detached mode.
12 -D (-r) Detach and logout remote (and reattach here).
13 -D -RR Do whatever is needed to get a screen session.
14 -e xy Change command characters.
15 -f Flow control on, -fn = off, -fa = auto.
16 -h lines Set the size of the scrollback history buffer.
17 -i Interrupt output sooner when flow control is on.
18 -l Login mode on (update /var/run/utmp), -ln = off.
19 -ls [match] or
20 -list Do nothing, just list our SockDir [on possible matches].
21 -L Turn on output logging.
22 -m ignore $STY variable, do create a new screen session.
23 -O Choose optimal output rather than exact vt100 emulation.
24 -p window Preselect the named window if it exists.
25 -q Quiet startup. Exits with non-zero return code if unsuccessful.
26 -Q Commands will send the response to the stdout of the querying process.
27 -r [session] Reattach to a detached screen process.
28 -R Reattach if possible, otherwise start a new session.
29 -s shell Shell to execute rather than $SHELL.
30 -S sockname Name this session

.sockname instead of

...
31 -t title Set title. (window‘s name).
32 -T term Use term as $TERM for windows, rather than "screen".
33 -U Tell screen to use UTF-8 encoding.
34 -v Print "Screen version 4.01.00devel (GNU) 2-May-06".
35 -wipe [match] Do nothing, just clean up SockDir [on possible matches].
36 -x Attach to a not detached screen. (Multi display mode).
37 -X Execute as a screen command in the specified session.