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General Linux Notes

#grep "model name" /proc/cpuinfo model name : Intel(R) Xeon(TM) CPU 3.00GHz

Linux Networking Notes

/etc/syconfig/network
GATEWAY=192.168.2.1
GATEWAYDEV=eth1

/etc/rc.d/init.d/network stop
/etc/rc.d/init.d/network start
/etc/rc.d/init.d/network restart

route -e
route add -host 123.213.221.231 eth1
route add default gw 192.168.1.254
route add -net 10.13.21.0 netmask 255.255.255.0 gw 192.168.10.254 eth0
route del -net 10.13.21.0 netmask 255.255.255.0 gw 192.168.10.254 eth0
ifconfig -a eth0 192.168.1.5 netmask 255.255.255.0

Routes are made permanent in Red Hat Linux by adding routes to /etc/sysconfig/static-routes

service network restart

/etc/resolv.conf
nameserver 66.28.0.45

find . -type f | xargs perl -pi -e 's/find/replace/g'
find . -name "*" -print | xargs grep search_key
find / -type f -size +20000k -exec ls -lh {} \; | awk '{ print $9 ": " $5 }'
to find if a package is installed:
rpm -qa | grep
to list the contets of that package:
rpm -ql
cant find the mysql.sock?
mysql -u root -p -h localhost

NTP

[root@pype02 ~]# date Wed Apr 11 08:22:29 PDT 2007 [root@pype02 ~]# [root@pype02 etc]# service ntpd stop [root@pype02 etc]# ntpdate -u 10.1.1.12 11 Apr 11:41:23 ntpdate[32042]: step time server 10.1.1.12 offset 892.821144 sec [root@pype02 etc]# ntpdate -u 10.1.1.12 11 Apr 11:41:26 ntpdate[32043]: adjust time server 10.1.1.12 offset 0.000058 sec [root@pype02 etc]# [root@pype02 etc]# service ntpd start ntpd: Synchronizing with time server: [ OK ] Starting ntpd: [ OK ] [root@pype02 etc]# ntpq -p remote refid st t when poll reach delay offset jitter ============================================================================== 10.1.1.12 172.18.137.252 3 u 3 64 1 0.430 0.103 0.004 [root@pype02 etc]# [root@pype02 etc]# date Wed Apr 11 11:42:21 EDT 2007 [root@pype02 etc]#

Parkinson's Law: Work expands to fill the time alloted it.