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I am trying to create a script to add a line to the /etc/exports file. I am root user and can do it from cli but when I put an echo 'test' >> /etc/testfile or echo 'add line' >> /etc/exports in a script I get a 'permission denied'. What do I need to do to make this work within a script?
I execute from a working directory.
make a copy of the exports file
insert a line at bottom of the file.
copy the changed file back over.
the first two steps work. the last step is where I receive an error.
I'm far from wise, I'm afraid ... but I can read, and
occasionally understand what I take in ;}
After a decade or so of Linux use it seemed "obvious" that the
re-direct was not part of what's run under sudo (otherwise a
permission problem wouldn't have arisen). How to wrap that all
up would have taken me a few minutes of thought, instead I looked
at the sudo man-page and searched for re-direct.
From the sudo man-page
To make a usage listing of the directories in the /home partition.
Note that this runs the commands in a sub-shell to make the cd and file
$ sudo sh -c "cd /home ; du -s * | sort -rn > USAGE"