Data update

Task/Generate-Chess960-starting-position/UNIX-Shell/generate-chess960-starting-position.sh

@@ -0,0 +1,23 @@
+declare -a pieces=(♖ ♖ ♖ ♕ ♗ ♗ ♘ ♘)
+declare -i i pick index
+declare -ai picking_history
+declare attempt
+
+until [[ "$attempt" =~ ♗(..)*♗ ]]
+do
+  attempt=''
+  picking_history=()
+  for _ in {1..8}
+  do
+    while ((picking_history[pick=RANDOM%8]++))
+    do :
+    done
+    attempt+="${pieces[pick]}"
+  done
+done
+for i in {0..7}
+do
+  if [[ "${attempt:i:1}" = ♖ ]] && ((index++))
+  then echo "${attempt:0:i}♔${attempt:i+1}"; break;
+  fi
+done