vim ~/.Xmodmap
1 remove Lock = Caps_Lock
2 keysym Escape = Caps_Lock
3 keysym Caps_Lock = Escape
4 add Lock = Caps_Lock
"这个是我喜欢的,一旦一行的字符超出108个的话就把那些字符的背景设为红色
highlight OverLength ctermbg=red ctermfg=white guibg=#592929
match OverLength /\%109v.+/
highlight OverLength ctermbg=red ctermfg=white guibg=#592929
match OverLength /\%109v.+/