Linux命令之在终端展示「日历」

[root@iZo7e61fz42ik0Z ~]# yum -y install boxes
[root@iZo7e61fz42ik0Z ~]# cal | boxes -d diamonds -p a1t2l3 | boxes -a c -d scroll
 / ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ \
|  /~~\                                              /~~\  |
|\ \   |         /\          /\          /\         |   / /|
| \   /|      /\//\\/\    /\//\\/\    /\//\\/\      |\   / |
|  ~~  |   /\//\\\///\\/\//\\\///\\/\//\\\///\\/\   |  ~~  |
|      |  //\\\//\/\\///\\\//\/\\///\\\//\/\\///\\  |      |
|      |  \\//\/                            \/\\//  |      |
|      |   \/                                  \/   |      |
|      |   /\          December 2018           /\   |      |
|      |  //\\     Su Mo Tu We Th Fr Sa       //\\  |      |
|      |  \\//                        1       \\//  |      |
|      |   \/       2  3  4  5  6  7  8        \/   |      |
|      |   /\       9 10 11 12 13 14 15        /\   |      |
|      |  //\\     16 17 18 19 20 21 22       //\\  |      |
|      |  \\//     23 24 25 26 27 28 29       \\//  |      |
|      |   \/      30 31                       \/   |      |
|      |   /\                                  /\   |      |
|      |  //\\/\                            /\//\\  |      |
|      |  \\///\\/\//\\\///\\/\//\\\///\\/\//\\\//  |      |
|      |   \/\\///\\\//\/\\///\\\//\/\\///\\\//\/   |      |
|      |      \/\\//\/    \/\\//\/    \/\\//\/      |      |
|      |         \/          \/          \/         |      |
|      |                                            |      |
 \     |~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~|     /
  \   /                                              \   /
   ~~~                                                ~~~

[root@iZo7e61fz42ik0Z ~]# clear;cal|boxes -d diamonds -p a1t2l3|boxes -a c -d scroll|lolcat;sleep 3;while :;do echo $LINES $COLUMNS $(($RANDOM%$COLUMNS)) $(printf "\u2744\n");sleep 0.1;done|gawk '{a[$3]=0;for(x in a) {o=a[x];a[x]=a[x]+1;printf "\033[%s;%sH ",o,x;printf "\033[%s;%sH%s \033[0;0H",a[x],x,$4;}}'