Fillin (hover over or click) the blanks to learn about Linux, or create your own lines

+ The Linux locate command reads  one or more databases prepared by updatedb
+ See how much memory available on Linux using cat /proc/meminfo command or with just the command free
+ To see if two files are identical in Linux use the sum command
+ memcached is a highly effective caching daemon, which was especially designed to decrease database load in dynamic web applications.
+ You can verify iptables has the correct rule by doing: iptables -nvL
+ SFTP is like a remote file system protocol.
+ To see which sockets are listening for network requests, you can use netstat -a | grep LISTEN
+ The SCP protocol is superseded by the more comprehensive SFTP protocol, which is also based on SSH.
+ SFTP attempts to be more platform-independent than SCP
+ The make utility determines which pieces of a large program need to be recompiled and issues the commands to recompile them.
+ Exim aims to be a general and flexible mailer with extensive facilities for checking incoming e-mail.
+ The SCP protocol runs on port 22
+ Exim is a MTA used on Unix-like operating systems.
+ A "hard link" and the original share the same inode
+ You cannot make a hard link to a directory, and hard links cannot cross filesystem boundaries.
+ Symlinks for short, Symbolic links actually refer to a different file, by name.
+ To run one cron job from another run .. curl --silent --compressed http://example.com/cron.php


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