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This is longer than others on here. The reason for this is I have combined two different matrix commands so it would work on all computers. I logged onto my server through a computer and it worked fine. I logged into my server through a mac and it looked $4!t so I have made one that works through both.
you could save the code between if and fi to a shell script named smiley.sh with the first argument as and then do a smiley.sh to see if the command succeeded. a bit needless but who cares ;)
Strangely enough, there is no option --lines=[negative] with tail, like the head's one, so we have to use sed, which is very short and clear, you see.
Strangely more enough, skipping lines at the bottom with sed is not short nor clear. From Sed one liner :
# delete the last 10 lines of a file
$ sed -e :a -e '$d;N;2,10ba' -e 'P;D' # method 1
$ sed -n -e :a -e '1,10!{P;N;D;};N;ba' # method 2