| OpenSSH | /usr/sbin/sshd -t && echo $? /usr/sbin/sshd -T |
| Apache | /usr/sbin/apache2 -t apachectl configtest |
| nginx | /usr/local/nginx/sbin/nginx -t /usr/local/nginx/sbin/nginx -t -c /usr/local/nginx/conf/nginx.conf |
| lighttpd | /usr/local/sbin/lighttpd -t -f /usr/local/etc/lighttpd/cyberciti.biz/lighttpd.conf |
| Bind (named server config) | named-checkconf /etc/named.conf |
| Bind (zone syntx) | named-checkzone cyberciti.biz /var/named/zone.cyberciti.biz |
| Squid proxy | /usr/sbin/squid -k check /usr/sbin/squid -k parse |
| MySQL server | mysqld –verbose –help /usr/libexec/mysqld –verbose –help 1>/dev/null |
| Postfix MTA | postfix check postfix -vvv |
| Samba SMB/CIFS | testparm -v |
| tcpd | tcpdchk tcpdchk -v |
| dhcpd (DHCP / BOOTP) server | dhcpd -t -cf /path/to/dhcpd.testing.conf |
| vsftpd server | vsftpd -olisten=NO /path/to/vsftpd.testing.conf |
| nagios | nagios -v /path/to/testing/nagios.cfg |
| Openntpd NTPD server | ntpd -d -f /usr/local/etc/ntpd.conf -n |
| Xorg (X11 Server) | Xorg -config /path/to/xorg.conf.new -retro |
| syslogd / rsyslogd | rsyslogd -c4 -f /etc/rsyslog.testing.conf -N 1 |
| CUPS Printing System | cupsd -f -c /path/to/cupsd.testing.conf -t |
| slapd (OpenLDAP) | slapd -Tt |
| varnishd | varnishd -C -f /path/to/wordpress.vlc |
| exim MTA | exim -bV |
| Bash/Ksh scripts | bash -n ./myscript ksh -n /path/to/script.ksh |
| BSD pf firewall | pfctl -nf /etc/pf.conf |
| proftpd | proftpd -t -c /path/to/proftpd.testing.conf |
| Perl scripts | perl -c /path/to/script.pl perl -wc /path/to/script.pl |
http://www.cyberciti.biz/tips/check-unix-linux-configuration-file-for-syntax-errors.html