How to do version-control repository update in crontab?

I'm trying to automate version-control repository update in crontab. The following script /home/usr/mrbean/bin/update.sh works in interactive Bash command-line: #!/bin/bash ROOTPATH="/home/user/mrbean/temp/" cd $ROOTPATH SSHTMPFILE="${ROOTPATH}ssh-agent.cf" ssh-agent -s | head -n 2 > "$SSHTMPFILE" function killsshagent { /bin/kill $SSH_AGENT_PID } trap killsshagent EXIT if [ -f "$SSHTMPFILE" ]; then source "$SSHTMPFILE" ssh-add rm "$SSHTMPFILE" fi killsshagent if [ hostname == "mrbeancomp.local" ]; then REPODIR="/home/usr/mrbean/repo/" cd $REPODIR cvs update -dP > "$HOME/log/log.txt" fi I then add @hourly /home/usr/mrbean/bin/update.sh The script works by itseful when invoked in interactive Bash shell but not via crontab. It gives errors and sent to system mail /var/mail/mrbean: Permission denied, please try again. Permission denied, please try again. Permission denied (publickey,gssapi-with-mic,password). cvs [update aborted]: end of file from server (consult above messages if any) ### [Update] killsshagent added in program so ssh-agent is not dangling. ### [Update] Tried an adapted program on a Git repository and experienced same issue. Mr. Bean isn't allowed to immediately abandon this CVS repo and switch to a new Git one. ### [Update] I have multiple identity files in $HOME/.ssh/. Is it possible that when running from crontab, I need to specify which identity file to use? If so, how?