One Line linux Commands

One Line linux Commands:—-
To find a list of all Open Ports
$ netstat -tulpn
Linux Disk Utilization Command
$ vmstat -D
Which Shell are you in?
$ ps -p $$
Number of http connections from an IP
$ netstat -nut | awk '{print $5}' | cut -d : -f1| sort | uniq -c | sort -n
To find current working directory of a PID
$ pwdx [pid]
To format a drive to ext3
$ mkfs.ext3 [device_name]
To know when the server was last rebooted
$ last reboot
To know when the server was last Shutdown
$ last -x shutdown
Removing Semaphores for Apache
$ ipcs -s | grep nobody | perl -e 'while (<stdin>) { @a=split(/\s+/); print `ipcrm sem $a[1]`}'