Zadanie

Załóżmy, że urodziłeś się pierwszego dnia Ery Uniksa 1 i przeżyjesz 80 lat. Ile to dni, tygodni i miesięcy?

Dni:

$ echo $((80*365))
29200

$ qalc -t '80 years / days'
29220

Tygodni:

$ echo $((80*52))
4160

$ qalc -t 'round(80 years / weeks)'
4174

Miesięcy:

$ echo $((80*12))
960

Data 80. urodzin to:

$ qalc -t 'addYears(date(1970),80)'
"2050-01-01"

$ qalc -t 'addYears(1970-01-01;80)'
"2050-01-01"

Dni do przeżycia:

$ qalc -t 'days(date(1970),date(1970+80))'
29220

Do dzisiaj minęło:

$ qalc -t 'days(date(1970),today)'
18921

Liczba przeżytych pełnych miesięcy:

$ qalc -t 'floor(yearfrac(date(1970),today) * 12)'
622

Wizualizacja

Ile już minęło a ile zostało? Zobaczmy…

Oczekiwana długość życia w miesiącach:

$ export LIFE_EXPECT=$((80*12))

Liczba przeżytych miesięcy:

$ export MONTHS_LIVED=$(qalc -t 'floor(yearfrac(date(1970),today) * 12)')

Pokaż w dekadach:

$ for i in $(seq $LIFE_EXPECT); do 
[ $i -gt $MONTHS_LIVED ] \
&& m+='\033[0;40;32m-\033[0m' \
|| m+='\033[0;40;31mx\033[0m'; 
(( $i % 120 == 0 )) && echo -e $m && unset m; 
done
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Pokaż w cyklach pięcioletnich:

$ for i in $(seq $LIFE_EXPECT); do 
[ $i -gt $MONTHS_LIVED ] && m+='◻' || m+='◼'; 
(( $i % 60 == 0 )) && echo $m && unset m; done
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More information

Liczbę dni do przeżycia można obliczyć też tak:

$ qalc -t 'days(date(1970),addYears(date(1970),80))'

Znaki i ich wartości HEX:

$ var="$(echo -n '◻' | od -An -tx1)"; printf '\\x%s' ${var^^}
\xE2\x97\xBB

$ echo -ne "\xE2\x97\xBB"
◻

$ echo -ne "\xE2\x97\xBC"
◼

$ echo -n $'\xE2\x97\xBB'|xxd
00000000: e297 bb                        ...

$ echo -n $'\xE2\x97\xBB'|hexdump
00000000  e2 97 bb
00000003

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Refs

  1. Era Uniksa rozpoczęła w czwartek, 1 stycznia 1970 r. o godz. 00:00:00 UT. ↩︎