ttail/src/include/doxygen.h

/**@page ttail
 *@brief timed tail for logfiles
 *@section SYNOSPIS
 *ttail [OPTION]... [FILE]...
 *@section DESCRIPTION
 *Display loglines given a minimum date and/or a maximum date.
 *
 *For huge files (or a huge list of files) you should have better performance
 *giving files as argument (thank's to binary search on file list and in files).
 *
 *@par -d --date-min=DATE
 *Start to output loglines starting from this date
 *@par -m --date-max=DATE
 *Stop to output loglines starting from this date
 *@par -f --date-format=FMT
 *The date format present in the logfiles and used by -d --date-min and
 *-m --date-max options (see @ref datefmt for more details)
 *@par -p --prefix-len
 *Set a constant prefix len to drop for each logline
 *@par -P --permissive
 *Tell ttail to continue after some errors (prefix or date not found, invalid file, etc.)
 *@par -r --re-prefix=REGEX
 *Drop matching prefix for each logline
 *@par -E --re-extended 
 *Interpret -r --re-prefix as an extended regular expression (specified by 
 *POSIX)
 *@par -I --re-ignore-cas
 *Ignore case for -r --re-prefix option (specified by POSIX)
 *@par -v[v[v[...]]]
 *Augment the loglevel
 *
 *@section datefmt Date formats
 *
 * ttail understand two date formats : strprtime and relative
 *
 *@subsection datefmt_rel Relative date format
 *Relative date format is used with -d --date-min or -m --date-max arguments.
 *The shape of a relative date is "-#[VAL][UNIT]" with VAL an integer and UNIT
 *one of the recognized units :
 *- y[ear]
 *- M[onth]
 *- d[ay]
 *- h[our]
 *- m[in]
 *- s[ec]
 *
 *@subsection datefmt_strptime Strptime date format
 * The supported input field descriptors are listed below.  In case a text string (such as the name
 * of a day of the week or a month name) is to be matched, the comparison is case insensitive.   In
 * case a number is to be matched, leading zeros are permitted but not required.
 * 
 * \%%     The % character.
 * 
 * \%a or %A
 * The  name  of the day of the week according to the current locale, in abbreviated form or
 * the full name.
 * 
 * \%b or %B or %h
 * The month name according to the current locale, in abbreviated form or the full name.
 * 
 * \%c     The date and time representation for the current locale.
 * 
 * \%C     The century number (0-99).
 * 
 * \%d or %e
 * The day of month (1-31).
 * 
 * \%D     Equivalent to %m/%d/%y.  (This is the American style date, very confusing  to  non-Ameri‐
 * cans,  especially  since %d/%m/%y is widely used in Europe.  The ISO 8601 standard format
 * is %Y-%m-%d.)
 * 
 * \%H     The hour (0-23).
 * 
 * \%I     The hour on a 12-hour clock (1-12).
 * 
 * \%j     The day number in the year (1-366).
 * 
 * \%m     The month number (1-12).
 * 
 * \%M     The minute (0-59).
 * 
 * \%n     Arbitrary whitespace.
 * 
 * \%p     The locale's equivalent of AM or PM.  (Note: there may be none.)
 * 
 * \%r     The 12-hour clock time (using the locale's AM or PM).  In the POSIX locale equivalent  to
 * \%I:%M:%S  %p.  If t_fmt_ampm is empty in the LC_TIME part of the current locale, then the
 * behavior is undefined.
 * 
 * \%R     Equivalent to %H:%M.
 * 
 * \%S     The second (0-60; 60 may occur for leap seconds; earlier also 61 was allowed).
 * 
 * \%t     Arbitrary whitespace.
 * 
 * \%T     Equivalent to %H:%M:%S.
 * 
 * \%U     The week number with Sunday the first day of the week (0-53).  The first Sunday of  Janu‐
 * ary is the first day of week 1.
 * 
 * \%w     The ordinal number of the day of the week (0-6), with Sunday = 0.
 * 
 * \%W     The  week number with Monday the first day of the week (0-53).  The first Monday of Janu‐
 * ary is the first day of week 1.
 * 
 * \%x     The date, using the locale's date format.
 * 
 * \%X     The time, using the locale's time format.
 * 
 * \%y     The year within century (0-99).  When a century is not otherwise specified, values in the
 * range  69-99  refer  to  years  in the twentieth century (1969-1999); values in the range
 * 00-68 refer to years in the twenty-first century (2000-2068).
 * 
 * \%Y     The year, including century (for example, 1991).
 * 
 * Some field descriptors can be modified by the E or O modifier characters  to  indicate  that  an
 * alternative  format or specification should be used.  If the alternative format or specification
 * does not exist in the current locale, the unmodified field descriptor is used.
 * 
 * 
 * The E modifier specifies that the input string may contain alternative locale-dependent versions
 * of the date and time representation:
 * 
 * \%Ec    The locale's alternative date and time representation.
 * 
 * \%EC    The name of the base year (period) in the locale's alternative representation.
 * 
 * \%Ex    The locale's alternative date representation.
 * 
 * \%EX    The locale's alternative time representation.
 * 
 * \%Ey    The offset from %EC (year only) in the locale's alternative representation.
 * 
 * \%EY    The full alternative year representation.
 * 
 * The O modifier specifies that the numerical input may be in an alternative locale-dependent for‐
 * mat:
 * 
 * \%Od or %Oe
 * The day of the month using the locale's alternative numeric symbols;  leading  zeros  are
 * permitted but not required.
 * 
 * \%OH    The hour (24-hour clock) using the locale's alternative numeric symbols.
 * 
 * \%OI    The hour (12-hour clock) using the locale's alternative numeric symbols.
 * 
 * \%Om    The month using the locale's alternative numeric symbols.
 * 
 * \%OM    The minutes using the locale's alternative numeric symbols.
 * 
 * \%OS    The seconds using the locale's alternative numeric symbols.
 * 
 * \%OU    The  week  number  of  the  year (Sunday as the first day of the week) using the locale's
 * alternative numeric symbols.
 * 
 * \%Ow    The ordinal number of the day of the week (Sunday=0),
 * using the locale's alternative numeric symbols.
 * 
 * \%OW    The week number of the year (Monday as the first day of  the  week)  using  the  locale's
 * alternative numeric symbols.
 * 
 * \%Oy    The year (offset from %C) using the locale's alternative numeric symbols.
 *
 *@section AUTHOR
 *Written by Yann Weber <yann.weber@members.fsf.org>
 *
 *@section COPYRIGHT
 *Copyright  ©  2017  Weber Yann  License GPLv3+: GNU GPL version 3 or later 
 *<http://gnu.org/licenses/gpl.html>.
 *
 *This is free software: you are free  to  change  and  redistribute  it.
 *There is NO WARRANTY, to the extent permitted by law.
 *
 */

/**@mainpage
 *
 *Super options : -d -r -p -v -m
 */