bin/ovr


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
32
33
34
35
36
37
38
39
40
41
42
43
44

#!/bin/sh

trap '' INT;


err()
{
	>&2 echo "$(basename "$0"): error: $*";
	exit 1;
}


n=1
while test $# -ge 1; do
	case "$1" in
	-n | --lines)
		if test $# -lt 2; then
			err "$1: Missing option argument.";
		fi;
		n="$2";
		shift;
		;;
	-*)
		err "$1: Unknown option.";
		;;
	*)
		err "$1: Unknown argument.";
		;;
	esac;
	shift;
done;


permanent=;

enter() { setterm --linewrap off; tput smcup; } >/dev/tty;
leave() { setterm --linewrap on; tput rmcup; } >/dev/tty;

trap leave QUIT TERM;

enter;
permanent="$(tee /dev/tty | tail -n "$n"; echo x)";
leave;
printf '%s' "${permanent%x}";