/usr/bin/expire_backups
/usr/bin/fsck.s3ql
/usr/bin/mkfs.s3ql
/usr/bin/mount.s3ql
/usr/bin/parallel-cp
/usr/bin/s3qladm
/usr/bin/s3qlcp
/usr/bin/s3qlctrl
/usr/bin/s3qllock
/usr/bin/s3ql_oauth_client
/usr/bin/s3qlrm
/usr/bin/s3qlstat
/usr/bin/s3ql_verify
/usr/bin/umount.s3ql
You may install this package on Debian with
apt-get
install s3ql