This blog is a cheat slip of commands I use on a regular basis, but where I also google for all the time.
- Check the running Linux distribution / Operating system Version
# cat /etc/issue.net | head -1
Oracle Linux Server release 5.7
or since Oracle Linux 6:# cat /etc/oracle-release
Oracle Linux Server release 7.3 - Check for ports in use
$ netstat -nplt - ssh using private key and port forewarding
$ ssh oracle@«ipadress» -i .ssh/id_rsa -L 5503:localhost:5500 - search for a string, i.e. "ol7.localdomain"
$ grep -r ol7.localdomain *- if your sear phrase contains blanks, put the search term in ""
- recursive = -r- case in-sensitive = -i - check, if a package is installed in your linux distribution (e.g. a JDK rpm):
# rpm -aq | grep -i jdk - to be continued ...
