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tree command

Hi there,

First time poster to this group.  I an ICT/computing teacher in a secondary school in the UK.  We've decided to attempt a Linux assessment for our year 10 computing kids and we're using ttylinux.  One of the criteria is to use the 'tree' command, but I'm getting a "command not found error", when I type in "tree -d".

Any information, no matter how small would be greatly appreciated.