rev. One nice comment pointed out, that the rev command can be used for searching inside logfiles (Thanks to phoxis.org).
Like it was said there, the command
yeslooks even more useless:
yes - output a string repeatedly until killed
Ok - it can be used for scripts to answer call backs. But which kind of script needs always the same answer? (and commands like "apt-get" support this via the option "-y".
Any other suggestions about useless bash commands?