/usr/bin/olpc-volume is in olpc-kbdshim 27-1build2.
This file is owned by root:root, with mode 0o755.
The actual contents of the file can be viewed below.
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 | #!/bin/sh
# adjust OLPC XO speaker volume
usage()
{
echo "usage: ${0##*/} {up|down|max|min|<0-100>}"
exit 1;
}
case $1 in
max) volchg=100% ;;
min) volchg=0 ;;
up) volchg="10%+" ;;
down) volchg="10%-" ;;
100|[0-9]|[0-9][0-9]) volchg=$1% ;;
*)
usage
;;
esac
amixer -q set Master "$volchg" unmute
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