enables vi-mode editing and places sh into vi insert mode. With vi-mode enabled ... sh can be switched between insert mode and command mode. It is similar
NAME shuf - generate
NAME SHOW - show
NAME shred - overwrite
NAME shmat, shmdt
NAME shasum - Print
NAME shmget - allocates
NAME shmctl - System
NAME shadow - shadowed
NAME shells - pathnames
NAME sha1sum - compute
NAME shutdown - shut
NAME shm_open
NAME sha384sum - compute
NAME sha256sum - compute
NAME sha224sum - compute
NAME sha512sum - compute