root@localhost:$ vi .bash_profile
type :q ， then got below .
root@localhost:$ :1+rk9=1b5b32307e^[\^[P1+rk;=1b5b32317e^[\^[P1+rF1=1b5b32337e^[\^[P1+rF2=1b5b32347e^[\^[P0+r2531^[\^[P0+r2638^[\^[P1+rkb=08^[\^[P1+rkI=1b5b327e^[\^[P1+rkD=1b5b337e^[\^[P1+rkh=1b5b48^[\
when type enter
then all characters disappear, got below
root@localhost:$
root@localhost:$ vi .bash_profile type :q ， then got below . root@localhost:$ :1+rk9=1b5b32307e^[\^[P1+rk;=1b5b32317e^[\^[P1+rF1=1b5b32337e^[\^[P1+rF2=1b5b32347e^[\^[P0+r2531^[\^[P0+r2638^[\^[P1+rkb=08^[\^[P1+rkI=1b5b327e^[\^[P1+rkD=1b5b337e^[\^[P1+rkh=1b5b48^[\
when type enter then all characters disappear, got below root@localhost:$