When I was entering the command
su > echo "sachin"
it was asking for a password. When I gave my password, some strange things happened as you can see:
One more thing: there is another user, Hadoop, on my laptop, but when I do
su > echo "Hadoop"
it says
no passwd entry for Hadoop
What does this mean?
1 Answer
Ah! Nice puzzle!
Just say "exit", and all your files will be there (and the output you miss in a file called echo).
Explication:
su > echo user
is the same as
su user > echo
So you are starting a (sub)shell with su (switch user) to your user, with all output redirected to a file called echo!
Look:
[romano:~] % cd tmp/dvd-usa-hd
[romano:~/tmp/dvd-usa-hd] % ls
dvd-usa-hd_01_01.avi
[romano:~/tmp/dvd-usa-hd] % su > echo romano
Password:
[romano:~/tmp/dvd-usa-hd] % ls
[romano:~/tmp/dvd-usa-hd] % exit
[romano:~/tmp/dvd-usa-hd] % ls
dvd-usa-hd_01_01.avi echo
[romano:~/tmp/dvd-usa-hd] % cat echo
dvd-usa-hd_01_01.avi
echo
[romano:~/tmp/dvd-usa-hd] %
