Undo Remove Files

Let's say that your directory is /vobs/somevob/somedir. The version of the directory with two files in it was /main/3; the version with one file was therefore /main/4. The dropped file is /vobs/somevob/somedir/crucial. Assuming ct is an alias for cleartool, you then do:

cd /vobs/somevob/somedir
ct co -c 'Recover file crucial' .
ct ln .@@/main/3/crucial .
ct ci -nc .

The first line means I don't have to type the path to the directory in the other three commands; otherwise, it is optional. The second line checks out the directory so it can be edited. The last line checks in the modified directory. The third line is where the magic occurs...
The ct ln .@@/main/3/crucial . line identifies the file crucial that was seen in version /main/3 of the directory . and links it to the current directory (the checked out version of the directory). The file version you see will be the one chosen by your cspec, but the correct file is in the view (assuming you do in fact pick up /vobs/somevob/somedir@@/main/5 with your cspec).