I accidentally deleted my file hello.c. How can I recover it?
There is no “Recycle Bin” in Unix. When you delete a file, it is gone. You can email restores@phoenix to have CIT restore your file from their tape backup. First, you might want to check that hello.c didn’t end up in the wrong directory by accident. Second, you may have a file ~hello.c in your directory: this is a backup created by emacs. If it is sufficiently recent, type “mv ~hello.c hello.c” to rename.