Some common unix admin stuff for Fedora 8.

Apache (httpd)

Edit conf file:

nano /etc/httpd/conf/httpd.conf

Restart:

/sbin/service httpd restart

Bash

Syntax check script

bash -n script.sh

Diff

Diff directory trees

diff -rq dir1 dir2

Logs

Log dir:

cd /var/log

Apache log dir:

cd /var/log/httpd

Log watching:

tail -f my_log

Postfix

Edit main configuration

nano /etc/postfix/main.cf

Edit master configuration

nano /etc/postfix/master.cf

Watch mail log

tail -f /var/log/maillog

Get version

/usr/sbin/postconf -d | grep mail_version

Users and Groups

Add new user and group

useradd username

Add new user with initial group

useradd -g group username

Add new user with supplementary groups

useradd -G group1,group2,... username

Add new group

groupadd groupname

Add existing user to group

usermod -a -G groupname username

Change user's primary group

usermod -g groupname username

Disallow user login

usermod -s /sbin/nologin username

List users

cat /etc/passwd

List groups

cat /etc/group

Webmin

Restart

/etc/webmin/restart