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If you want to change the current directory in you terminal shell you will need a function.

Here is a bash solution:

$ pwd
/users/chubler

$ tail hist1.dat
3 4 1

$ function waitHist() {...

The following is more efficient and doesn't need a loop. Maybe it works for you?
tail -1 -f hist1.dat | awk '$2==2{exit}'
echo "Complete"

I'm not d'accord with Corona688's item 3), as tail -1 will always render the last line of that file which is appended every 10 seconds.
I'm not at all familiar with csh, but done - which provokes...

Your program is wrong in a variety of interesting ways.

1) You are using c-shell, csh because of #!/bin/csh, but your code is Bourne instead.

2) Once you fix that, your code is also missing a...