CAL(1)                     POSIX Programmer's Manual                    CAL(1)



PPRROOLLOOGG
       This manual page is part of the POSIX Programmer's Manual.  The OS
       implementation of this interface may differ (consult the corresponding
       OS manual page for details of OS behavior), or the interface may not be
       implemented on OS.

NNAAMMEE
       cal -- print a calendar

SSYYNNOOPPSSIISS
       cal [[[[_m_o_n_t_h]] _y_e_a_r]]

DDEESSCCRRIIPPTTIIOONN
       The _c_a_l utility shall write a calendar to standard output using the
       Julian calendar for dates from January 1, 1 through September 2, 1752
       and the Gregorian calendar for dates from September 14, 1752 through
       December 31, 9999 as though the Gregorian calendar had been adopted on
       September 14, 1752.

       If no operands are given, _c_a_l shall produce a one-month calendar for
       the current month in the current year. If only the _y_e_a_r operand is
       given, _c_a_l shall produce a calendar for all twelve months in the given
       calendar year. If both _m_o_n_t_h and _y_e_a_r operands are given, _c_a_l shall
       produce a one-month calendar for the given month in the given year.

OOPPTTIIOONNSS
       None.

OOPPEERRAANNDDSS
       The following operands shall be supported:

       _m_o_n_t_h     Specify the month to be displayed, represented as a decimal
                 integer from 1 (January) to 12 (December).

       _y_e_a_r      Specify the year for which the calendar is displayed,
                 represented as a decimal integer from 1 to 9999.

SSTTDDIINN
       Not used.

IINNPPUUTT FFIILLEESS
       None.

EENNVVIIRROONNMMEENNTT VVAARRIIAABBLLEESS
       The following environment variables shall affect the execution of _c_a_l:

       _L_A_N_G      Provide a default value for the internationalization
                 variables that are unset or null. (See the Base Definitions
                 volume of POSIX.1-2017, _S_e_c_t_i_o_n _8_._2, _I_n_t_e_r_n_a_t_i_o_n_a_l_i_z_a_t_i_o_n
                 _V_a_r_i_a_b_l_e_s for the precedence of internationalization
                 variables used to determine the values of locale categories.)

       _L_C___A_L_L    If set to a non-empty string value, override the values of
                 all the other internationalization variables.

       _L_C___C_T_Y_P_E  Determine the locale for the interpretation of sequences of
                 bytes of text data as characters (for example, single-byte as
                 opposed to multi-byte characters in arguments).

       _L_C___M_E_S_S_A_G_E_S
                 Determine the locale that should be used to affect the format
                 and contents of diagnostic messages written to standard
                 error, and informative messages written to standard output.

       _L_C___T_I_M_E   Determine the format and contents of the calendar.

       _N_L_S_P_A_T_H   Determine the location of message catalogs for the processing
                 of _L_C___M_E_S_S_A_G_E_S.

       _T_Z        Determine the timezone used to calculate the value of the
                 current month.

AASSYYNNCCHHRROONNOOUUSS EEVVEENNTTSS
       Default.

SSTTDDOOUUTT
       The standard output shall be used to display the calendar, in an
       unspecified format.

SSTTDDEERRRR
       The standard error shall be used only for diagnostic messages.

OOUUTTPPUUTT FFIILLEESS
       None.

EEXXTTEENNDDEEDD DDEESSCCRRIIPPTTIIOONN
       None.

EEXXIITT SSTTAATTUUSS
       The following exit values shall be returned:

        0    Successful completion.

       >0    An error occurred.

CCOONNSSEEQQUUEENNCCEESS OOFF EERRRROORRSS
       Default.

       _T_h_e _f_o_l_l_o_w_i_n_g _s_e_c_t_i_o_n_s _a_r_e _i_n_f_o_r_m_a_t_i_v_e_.

AAPPPPLLIICCAATTIIOONN UUSSAAGGEE
       Note that:


           cal 83

       refers to A.D. 83, not 1983.

EEXXAAMMPPLLEESS
       None.

RRAATTIIOONNAALLEE
       Earlier versions of this standard incorrectly required that the
       command:


           cal 2000

       write a one-month calendar for the current calendar month (no matter
       what the current year is) in the year 2000 to standard output. This did
       not match historic practice in any known version of the _c_a_l utility.
       The description has been updated to match historic practice.  When only
       the _y_e_a_r operand is given, _c_a_l writes a twelve-month calendar for the
       specified year.

FFUUTTUURREE DDIIRREECCTTIIOONNSS
       A future version of this standard may support locale-specific
       recognition of the date of adoption of the Gregorian calendar.

SSEEEE AALLSSOO
       The Base Definitions volume of POSIX.1-2017, _C_h_a_p_t_e_r _8, _E_n_v_i_r_o_n_m_e_n_t
       _V_a_r_i_a_b_l_e_s

CCOOPPYYRRIIGGHHTT
       Portions of this text are reprinted and reproduced in electronic form
       from IEEE Std 1003.1-2017, Standard for Information Technology --
       Portable Operating System Interface (POSIX), The Open Group Base
       Specifications Issue 7, 2018 Edition, Copyright (C) 2018 by the
       Institute of Electrical and Electronics Engineers, Inc and The Open
       Group.  In the event of any discrepancy between this version and the
       original IEEE and The Open Group Standard, the original IEEE and The
       Open Group Standard is the referee document. The original Standard can
       be obtained online at http://www.opengroup.org/unix/online.html .

       Any typographical or formatting errors that appear in this page are
       most likely to have been introduced during the conversion of the source
       files to man page format. To report such errors, see
       https://www.kernel.org/doc/man-pages/reporting_bugs.html .



IEEE/The Open Group                  2017                               CAL(1)
