I have tried:
sudo "some string" >> test.txt
But I am getting permission denied warning.
Can anyone help?
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Depends on how much access your administrator has given you via sudo. The simplest answer, assuming that you have permission to do so, is to run "sudo -s" to get a privileged shell and then just do your
echo somestring >> test.txt
as 'normal'. If you need to do it automatedly:
sudo /bin/sh -c 'echo somestring >> test.txt'
The reason that what you have won't work (other than the fact that you left what I assume to be an "echo" command out) is that the file redirection happens in the context of your shell and the sudo only applies to the command you told it to run.
You can try ex-way:
sudo ex +'$put =\"some string\"' -cwq foo.txt
It's simple in-place file editing and it's useful in scripts, so you don't have to do any shell piping.
Lots of people recommend
tee for this, but I don't like the side-effect of writing to
stdout. An alternative is
sh some_script.sh | sudo sh -c 'cat >> somefile.txt'
cat had an argument like
-a flag, that would be a little handier:
sh some_script.sh | sudo pseudocat -a somefile.txt
But unfortunately it doesn't.