openssh - disable scp and log all sftp connections

openssh-notes.txt

#Disable scp and logs all sftp connections

#Disable Scp
mv /usr/local/bin/scp{,out}

#Create fake scp message
cat > /usr/local/bin/scp <<EOF
#!/bin/bash
echo "This service allows ssh/sftp connections only"
EOF

#Create a wrapper script
cat > /usr/local/bin/sftp-wrapper<<EOF
#!/bin/sh
#
# sftpd wrapper script for executing pre/post session actions
#

# pre session actions and logging here
SOURCE_IP=\${SSH_CLIENT%% *}
MSG_SESSION_START="user \$LOGNAME session start from \$SOURCE_IP"
logger -p local5.notice -t sftpd-wrapper -i "\$MSG_SESSION_START"

# start actual SFTP session
/usr/libexec/openssh/sftp-server -f LOCAL5 -l VERBOSE

# add post session actions here
MSG_SESSION_STOP="user \$LOGNAME session ended from \$SOURCE_IP"
logger -p local5.notice -t sftpd-wrapper -i "\$MSG_SESSION_STOP"
EOF

#Add Subsystem
vi /etc/ssh/sshd_config

#Comment all subsystem and add the below line
Subsystem	sftp	/usr/local/bin/sftp-wrapper

###Enable logging
vi /etc/rsyslog.conf

#log all sftp transactions with output file sync
local5.*                                                -/var/log/sftp.log


#create sftp.log file
touch /var/log/sftp.log


#Restart services
service sshd restart
service rsyslog restart

can you please help me with this script?
is it one time config only or it has to be run at startup everytime?
where section #Create a wrapper script, ends ?
is it possible to block sftp, and allow SSH only?
is it working on ubuntu 14 and 16?