Initial data commit

Task/Long-year/UNIX-Shell/long-year-1.sh

@@ -0,0 +1,4 @@
+long_year() {
+  cal 1 $1 | grep -q ' 3 *$' && return 0
+  cal 12 $1 | grep -q ' 26 *$'
+}

Task/Long-year/UNIX-Shell/long-year-2.sh

@@ -0,0 +1,3 @@
+long_year() {
+  expr $(date -d "$1-12-28" +%V) = 53 >/dev/null
+}

Task/Long-year/UNIX-Shell/long-year-3.sh

@@ -0,0 +1,12 @@
+dec31wd() {
+  # return weekday (time_t tm_wday, 0=Sunday) of December 31st of the given year
+  typeset -i y=$1
+  echo $(( (y + y / 4 - y / 100 + y / 400) % 7 ))
+}
+
+# the year is long if the year starts or ends on a Thursday (starts on a
+# Thursday = the previous year ends on a Wednesday)
+long_year() {
+   typeset -i y=$1
+   (( 4 == $(dec31wd $y) || 3 == $(dec31wd $(( y - 1 ))) ))
+}

Task/Long-year/UNIX-Shell/long-year-4.sh

@@ -0,0 +1,5 @@
+for y in $(seq 1995 2045); do
+  if long_year $y; then
+    echo $y
+  fi
+done | column