Linux and Unix cheatsheet
AIX compression with TAR, COMPRESS, GZIP, ZCAT
tar tar in AIX by default does not support compression. You will need to incorporate with gzip command to have it tar and compress at the...
Linux Netfilter tweaks for High traffic servers
If you are serving a high traffic web/DNS server, and recently having PING loss to the server and not all HTTP request were successful to i...
How to show my NIC MTU value, and how do I change it to use Jumbo Frame?
How to show my NIC MTU value, and how do I change it to use Jumbo Frame? list current value $ lsattr -E -l en0 -a mtu ...
How do I telnet/check UDP ports whether it is open or not?
How do I telnet/check UDP ports whether it is open or not?
Use nmap as below, port UDP 123 is the common ntp daemon port.
$ nmap -p 123 -sU -P0 192.168.0.0
$ nc -zu 192.168.0.0 123
You may to look for “nc”, “iperf” tools as well.
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