SVN enforces elevation of comments. This requirement can be simply implemented using the svn pre-commit hook. Www.2cto.com enter the hooks directory of the repository, find the pre-commit.tmpl file, rename, remove the suffix. tmpl. Edit the pre-commit file: $ SVNLOOK log-t "$ TXN" "$ REPOS" | grep "[a-zA-Z0-9]">/dev/null | exit 1 commit-access-control.pl "$ REPOS" "$ TXN" commit-access-control.cfg | | comment out the three lines of exit 1 (with the # symbol added before ), add the following lines at this location: www.2cto.com LOGMSG = '$ SVNLOOK log-t "$ TXN" "$ REPOS" | grep "[a-zA-Z0-9]" | wc-C' if ["$ LOGMSG"-lt 5]; # The comments must not be less than five characters. You can customize then echo-e "nLog message cann' t be empty! You must input more than 5 chars as comment !. "1> & 2 exit 1 fi. Do not forget to add the execution permission.