Leap year in linux

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Can I know how to show a leap year between 2014-2020 in a Linux terminal?



Is there any way using some code like $cal - anything to show which year is leap year between 2014-2020 straightaway?






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Can I know how to show a leap year between 2014-2020 in a Linux terminal?



Is there any way using some code like $cal - anything to show which year is leap year between 2014-2020 straightaway?






command-line







share|improve this question









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lee is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
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  • 3




    stackoverflow.com/questions/32196628/…
    – Rinzwind
    2 hours ago












up vote
1
down vote

favorite









up vote
1
down vote

favorite











Can I know how to show a leap year between 2014-2020 in a Linux terminal?



Is there any way using some code like $cal - anything to show which year is leap year between 2014-2020 straightaway?






command-line







share|improve this question









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lee is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
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Can I know how to show a leap year between 2014-2020 in a Linux terminal?



Is there any way using some code like $cal - anything to show which year is leap year between 2014-2020 straightaway?






command-line




command-line






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lee is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
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share|improve this question









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edited 2 hours ago









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  • 3




    stackoverflow.com/questions/32196628/…
    – Rinzwind
    2 hours ago












  • 3




    stackoverflow.com/questions/32196628/…
    – Rinzwind
    2 hours ago







3




3




stackoverflow.com/questions/32196628/…
– Rinzwind
2 hours ago




stackoverflow.com/questions/32196628/…
– Rinzwind
2 hours ago










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You can make use of date's exit code to check for a leap year, relying on date's behaviour of generating a non 0 exit code for an invalid date, obviosuly there's no 29th of Feb in a non-leap year:



date -d $year-02-29 &>/dev/null
echo $?


as a function:



isleap() echo is not leap;


Usage:



$ isleap 2019
is not leap

$ isleap 2020
is leap


Regarding your question:




Can i know how to show leap year between 2014-2020 in linux terminal?




echo "Leap years between 2014 and 2020:";
for y in 2014..2020; do
 date -d $y-02-29 &>/dev/null && echo $y;
done





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    up vote
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    down vote













    You can make use of date's exit code to check for a leap year, relying on date's behaviour of generating a non 0 exit code for an invalid date, obviosuly there's no 29th of Feb in a non-leap year:



    date -d $year-02-29 &>/dev/null
    echo $?


    as a function:



    isleap() echo is not leap;


    Usage:



    $ isleap 2019
    is not leap

    $ isleap 2020
    is leap


    Regarding your question:




    Can i know how to show leap year between 2014-2020 in linux terminal?




    echo "Leap years between 2014 and 2020:";
    for y in 2014..2020; do
     date -d $y-02-29 &>/dev/null && echo $y;
    done





    share|improve this answer


























      up vote
      3
      down vote













      You can make use of date's exit code to check for a leap year, relying on date's behaviour of generating a non 0 exit code for an invalid date, obviosuly there's no 29th of Feb in a non-leap year:



      date -d $year-02-29 &>/dev/null
      echo $?


      as a function:



      isleap() echo is not leap;


      Usage:



      $ isleap 2019
      is not leap

      $ isleap 2020
      is leap


      Regarding your question:




      Can i know how to show leap year between 2014-2020 in linux terminal?




      echo "Leap years between 2014 and 2020:";
      for y in 2014..2020; do
       date -d $y-02-29 &>/dev/null && echo $y;
      done





      share|improve this answer
























        up vote
        3
        down vote










        up vote
        3
        down vote









        You can make use of date's exit code to check for a leap year, relying on date's behaviour of generating a non 0 exit code for an invalid date, obviosuly there's no 29th of Feb in a non-leap year:



        date -d $year-02-29 &>/dev/null
        echo $?


        as a function:



        isleap() echo is not leap;


        Usage:



        $ isleap 2019
        is not leap

        $ isleap 2020
        is leap


        Regarding your question:




        Can i know how to show leap year between 2014-2020 in linux terminal?




        echo "Leap years between 2014 and 2020:";
        for y in 2014..2020; do
         date -d $y-02-29 &>/dev/null && echo $y;
        done





        share|improve this answer














        You can make use of date's exit code to check for a leap year, relying on date's behaviour of generating a non 0 exit code for an invalid date, obviosuly there's no 29th of Feb in a non-leap year:



        date -d $year-02-29 &>/dev/null
        echo $?


        as a function:



        isleap() echo is not leap;


        Usage:



        $ isleap 2019
        is not leap

        $ isleap 2020
        is leap


        Regarding your question:




        Can i know how to show leap year between 2014-2020 in linux terminal?




        echo "Leap years between 2014 and 2020:";
        for y in 2014..2020; do
         date -d $y-02-29 &>/dev/null && echo $y;
        done






        share|improve this answer














        share|improve this answer



        share|improve this answer








        edited 2 hours ago









        Arronical

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        RoVo

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