convert epoch using date command
date -d ‘<Unix epoch> <epoch date> sec’ e.g. date -d ‘1970-01-01 988822888 sec’ would dated “Wed May 2 17:31:28 MYT 2001” 20080430 : get a particular date in epoch, e.g. date -d ‘Apr 30 2008 00:00:00’ ‘+%s’
Forget / forgot / cannot remember root password
On a FreeBSD server 1. reboot server 2. choose to boot into single user mode 3. mount -o rw <root partition> e.g. mount -o rw / 4. passwd <root account> e.g. passwd root 5. mount -o ro <root partition> e.g….
How to dig SRV record after creating it in DNS
dig <record type> <host.name> e.g dig SRV _someservice._port.hostname.domainame.com.my OR dig SRV _https._ICMP.host.takizo.com
ls & rm with regular expression
e.g. rm -rf backup-20070[8-9]-* would delete : backup-200708-morning backup-200708-evening backup-200709-night backup-200709-latenight but not : backup-200706-morning backup-200707-afternoon backup-200711-midnight e.g. ls backup-20070[1-9] would list all backup starting from January to September but leave October, November & December out, of year 2007.
sed with multiple criteria
sed -e 1d -e 50d -e ‘/junks/d’ would remove first and 50th line & any line(s) with the word “junks”. update 20080821 : sed -e ‘/^$/d’ would remove every empty line
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