I'm somewhat new to Linux and very new to the vi editor. Here is my issue:
I have a file that I want to append text to the end of each line within the file. The text to be added is the same.
How do I setup a command to mass append the text to each line? I have played with substitution but have not been able to append data at the end.

Here is an example. I have a file that looks like this:

du -sh us1234
du -sh us5678
du -sh us9abc
du -sh usefgh
du -sh usijgl
du -sh usmnop
du -sh usqrst

I want to append the following to each line:
" >> /tmp/output.txt"
So each line will look like:

du -sh us1234 >> /tmp/output.txt
du -sh us5678 >> /tmp/output.txt
du -sh us9abc >> /tmp/output.txt
du -sh usefgh >> /tmp/output.txt
du -sh usijgl >> /tmp/output.txt
du -sh usmnop >> /tmp/output.txt
du -sh usqrst >> /tmp/output.txt

How do I accomplish this with a single command?

Before:Command:After:Let's break it down:
1. <Esc>, : Go into command mode
2. 1,$ Execute this command on every line between 1 and End of file ("$")
3. s/$/ >> \/tmp\/output\.txt/ The command is "substitute" ("s/X/Y/")
4. /$/ >> \/tmp\/output\.txt/ This means:
a) substitute "end of line" ($)
b) for " >> /tmp/output.txt"
c) Escape the "/" and "." metacharacter (using "\")

'Hope that helps .. PSM

Or give vi a miss and use sed ;}

Cheers,
Tink

Thank you paulsm4 and tinkster. Both worked