command line - How do I save terminal output to a file?

How do I save the output of a command to a file?

Is there a way without using any software? I would like to know how.

Yes it is possible, just redirect the output to a file:

SomeCommand > SomeFile.txt  

Or if you want to append data:

SomeCommand >> SomeFile.txt

If you want stderr as well use this:

SomeCommand &> SomeFile.txt  

or this to append:

SomeCommand &>> SomeFile.txt  

if you want to have both stderr and output displayed on the console and in a file use this:

SomeCommand 2>&1 | tee SomeFile.txt

(If you want the output only, drop the 2 above)