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Sysadmin

Server and desktop tips, help, and how-tos for Mac, Linux, and Windows.

Find Active SSH Servers on a Subnet

December 4, 2017 mike Sysadmin

This example lists out the IPs that are on the SSH port (22) on a particular subnet. List out IPs (only) of open ssh ports

Using the Linux Shutdown Command

December 2, 2017 mike Sysadmin

Here are a few shutdown examples for quick reference. Turn Server Off Immediately Restart Immediately Restart in 45 minutes Restart at next 1 am Restart

Performing a Quick nmap Ping Scan on a Subnet

November 30, 2017 mike Sysadmin

This will quickly do a scan on a subnet to determine IP addresses on the network. Only Return IP Addresses If you only want to

Untar & Unzip a tar.gz File In One Step

November 28, 2017 mike Sysadmin

This command will untar and unzip all files in a single step. If you’re running Linux you’ll be doing this all the time so memorize

How to Detach and Background a Running Process From a SSH Session

October 31, 2017 mike Sysadmin

Sometimes you run a program at the command line and it’s running longer than you thought. You’re worried process might die if you walk away

Server to Server Copying Files With SCP

September 25, 2017 mike Sysadmin

To copy files between remote servers where transfers occur on the local host you use the -3 command line switch. This is useful if server1

See Headers Only From Command Line CURL

September 1, 2017 mike Sysadmin

To See headers only and not the HTML response from a web server, you can use the command line CURL program to do it. Output

How to Remove Spaces or Other Characters From File Names on Mac

June 30, 2017 mike Sysadmin

Both these commands work on most Linux and OSX/Mac machines. Replace spaces with dashes in files in a directory Replace a range of characers using

Get Folder Sizes in Current Directory Ubuntu

May 17, 2017 mike Sysadmin

This command will get you a -s summarized, -h human readable, listing of the . current directory and all subdirectories disk usage totaled to one

Search (Grep) Entire Hard Drive For String

February 8, 2017 mike Sysadmin

This command will search through your hard drive using the string command piped to the grep command. Swap /dev/sdc for your actual drive which can

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