current timestamp in linux

date command gives the current time

and date command accepts the date formatting.

so the timestamp is given by

date +%s




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DATE(1)     User Commands          DATE(1)

NAME
      date - print or set the system date and time

SYNOPSIS
      date [OPTION]... [+FORMAT]
      date [-u|--utc|--universal] [MMDDhhmm[[CC]YY][.ss]]

DESCRIPTION
      Display the current time in the given FORMAT, or set the system date.

      -d, --date=STRING
       display time described by STRING, not `now'

      -f, --file=DATEFILE
       like --date once for each line of DATEFILE

      -r, --reference=FILE
       display the last modification time of FILE

      -R, --rfc-2822
       output date and time in RFC 2822 format

      --rfc-3339=TIMESPEC
       output date and time in RFC 3339 format. TIMESPEC=`date', `sec-
       onds', or `ns' for date and time to the indicated precision.

      -s, --set=STRING
       set time described by STRING

      -u, --utc, --universal
       print or set Coordinated Universal Time

      --help display this help and exit

      --version
       output version information and exit

      FORMAT controls the output.  The only valid option for the second  form
      specifies Coordinated Universal Time.  Interpreted sequences are:

      %%     a literal %

      %a     locale's abbreviated weekday name (e.g., Sun)

      %A     locale's full weekday name (e.g., Sunday)

      %b     locale's abbreviated month name (e.g., Jan)

      %B     locale's full month name (e.g., January)

      %c     locale's date and time (e.g., Thu Mar  3 23:05:25 2005)

      %C     century; like %Y, except omit last two digits (e.g., 21)

      %d     day of month (e.g, 01)

      %D     date; same as %m/%d/%y

      %e     day of month, space padded; same as %_d

      %F     full date; same as %Y-%m-%d

      %g     the  last  two  digits  of the year corresponding to the %V week
       number

      %G     the year corresponding to the %V week number

      %h     same as %b

      %H     hour (00..23)

      %I     hour (01..12)

      %j     day of year (001..366)

      %k     hour ( 0..23)

      %l     hour ( 1..12)

      %m     month (01..12)

      %M     minute (00..59)

      %n     a newline

      %N     nanoseconds (000000000..999999999)

      %p     locale's equivalent of either AM or PM; blank if not known

      %P     like %p, but lower case

      %r     locale's 12-hour clock time (e.g., 11:11:04 PM)

      %R     24-hour hour and minute; same as %H:%M

      %s     seconds since 1970-01-01 00:00:00 UTC

      %S     second (00..60)

      %t     a tab

      %T     time; same as %H:%M:%S

      %u     day of week (1..7); 1 is Monday

      %U     week number of year with Sunday as first day of week (00..53)

      %V     week number of year with Monday as first day of week (01..53)

      %w     day of week (0..6); 0 is Sunday

      %W     week number of year with Monday as first day of week (00..53)

      %x     locale's date representation (e.g., 12/31/99)

      %X     locale's time representation (e.g., 23:13:48)

      %y     last two digits of year (00..99)

      %Y     year

      %z     +hhmm numeric timezone (e.g., -0400)

      %:z    +hh:mm numeric timezone (e.g., -04:00)

       %::z +hh:mm:ss numeric time zone (e.g., -04:00:00) %:::z numeric
       time  zone  with : to necessary precision (e.g., -04, +05:30) %Z
       alphabetic time zone abbreviation (e.g., EDT)

      By default, date  pads  numeric fields with  zeroes. The  following
      optional flags may follow `%':

       - (hyphen) do not pad the field _ (underscore) pad with spaces 0
       (zero) pad with zeros ^ use upper case if possible #  use  oppo-
       site case if possible

      After  any  flags  comes  an optional field width, as a decimal number;
      then an optional modifier, which is either E to use the locale's alter-
      nate  representations  if available, or O to use the locale's alternate
      numeric symbols if available.

AUTHOR
      Written by David MacKenzie.

REPORTING BUGS
      Report bugs to .

COPYRIGHT
      Copyright (C) 2005 Free Software Foundation, Inc.
      This is free software.  You may redistribute copies  of it  under  the
      terms    of     the      GNU      General    Public      License
      . There is NO WARRANTY,  to  the
      extent permitted by law.

SEE ALSO
      The  full documentation for date is maintained as a Texinfo manual.  If
      the info and date programs are properly installed  at  your  site,  the
      command

       info date

      should give you access to the complete manual.



date 5.93    October 2008          DATE(1)

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� 1994 Man-cgi 1.15, Panagiotis Christias