Common Linux Commands and Frequently Used Options

Can some one show me a shell script to remove all the files in a folder, which older than 3 days as compared to today's date.

$ find /path/to/folder -mtime +3 -exec rm -f {} \;

When using the ls -l command, how to pause the listing so that I can see everything in a directory.
Also, how to find out the version of Linux I'm using? When I type uname -a I am informed that I am using Linux but not what kind.

use the more command
ls -l | more

Sometimes the file /etc/issue has OS details if present.

cat /etc/issue

Personally I prefer "ls -l | less" as I can then scroll the output both up and down one line at a time if I want to. 

          Frequent Linux Commands:

dmesg List contents of the kernel message buffer
grep thisword thisfile List any lines from thisfile that contain thisword
netstat -t List active TCP connections
ping www.uiuc.edu Ping remote host www.uiuc.edu
ps axu Provide detailed list of running processes
su username run a shell with substitute user and group IDs
tar czf archive.tgz  . Pack contents of current directory into the compressed archive file archive.tgz
tar xzf archive.tgz Unpack the contents of the compressed archive file archive.tgz
traceroute www.hotmail.com Show the network path to www.hotmail.com
w Show users currently logged on and system statistics

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Frequently Used Options
See also common Linux Commands

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