This simple command allows the user to print the contents of a variable.
homer@deusexmachina:~ % echo "$LOGNAME" homer |
Use the netstat command to get information about all network connections to and from your machine.
homer@deusexmachina:~ % netstat Active Internet connections Proto Recv-Q Send-Q Local Address Foreign Address (state) tcp4 0 0 192.168.233.133.ssh vrrp.uglsmts51mg.50529 ESTABLISHED Active UNIX domain sockets Address Type Recv-Q Send-Q Inode Conn Refs Nextref Addr fffff800029ff4b0 stream 0 0 0 fffff800029ff5a0 0 0 fffff800029ff5a0 stream 0 0 0 fffff800029ff4b0 0 0 fffff800029ffb40 stream 0 0 fffff800028db1d8 0 0 0 /var/run/devd.pipe fffff800029ff3c0 dgram 0 0 0 fffff800029ff960 0 fffff800029ff690 fffff800029ff690 dgram 0 0 0 fffff800029ff960 0 fffff800029ff870 fffff800029ff780 dgram 0 0 0 fffff800029ffa50 0 0 fffff800029ff870 dgram 0 0 0 fffff800029ff960 0 0 fffff800029ff960 dgram 0 0 fffff800029f8b10 0 fffff800029ff3c0 0 /var/run/logpriv fffff800029ffa50 dgram 0 0 fffff800029f8ce8 0 fffff800029ff780 0 /var/run/log |
Do you want to see how much free space there is on your hard drive? use the df -Hla command to get this information.
homer@deusexmachina:~ % df -Hla Filesystem Size Used Avail Capacity Mounted on /dev/da0p2 19G 1.5G 16G 8% / devfs 1.0k 1.0k 0B 100% /dev |
This command gets the IP address of a host and feeds it to the host command.
homer@deusexmachina:~ % host `dig +short john.com` 212.156.252.162.in-addr.arpa domain name pointer perfora.net. |