Difference between ‘>’ & ‘>>’

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I always wonder what is the difference between > and >> signs in Linux whenever I wanted to redirect the output of a command such as ls to a file. I thought both do the same task without any difference and finally while I was making my own playlist for playing songs in my favorite player(mpg123), I found the difference.

Basically, the difference is really simple, > overwrites the file content but >> appends output to the end of the content.

For instance,

$ ls > t1.txt

Overwrite t1.txt and erases its previous data. However,

$ ls >> t1.txt

Appends the output to the end of t1.txt file.