bash: use vi mode.

dot/file/bashrc

@@ -1,6 +1,7 @@
 . $HOME/.shrc
 
 export PS1='; '
+set -o vi
 
 test -r "$LOGIN" && . "$LOGIN"
 test -r "$SETENV" && . "$SETENV" && setenv bash

lf/previewer

@@ -1,7 +1,9 @@
 #!/bin/sh
 draw() {
-  kitten icat --silent --stdin no --transfer-mode memory --place "${w}x${h}@${x}x${y}" "$1" </dev/null >/dev/tty
-  exit 1
+	if which kitten > /dev/null ; then
+		kitten icat --silent --stdin no --transfer-mode memory --place "${w}x${h}@${x}x${y}" "$1" </dev/null >/dev/tty
+		exit 1
+	fi
 }
 
 file="$1"