UNIX for Dummies Questions & Answers

Dear all,

I have numerous dat files (a.dat, b.dat...) containing 500 numeric values each. I would like to count them, based on their range and obtain a histogram or a counter.


INPUT:

a.dat
1.3
2.16
0.34
......

b.dat
1.54
0.94
3.13
.....

c.dat
2.34
4.12
2.7
.....


OUTPUT:
example-
a.dat: 2> - 200 ; 3> and 2< - 50 ; 3< -250
(the output can be in any comprehensive format)

Thanks,
Po

Code:

 
while read value
do
     #do your comparison here
     # write your logic here
done < a.dat

I used the following script, in vain!

Code:

#!/bin/csh
set k = 1
while ($k = 250)

set i=0
set low = 0
set medium = 0
set high = 0
foreach line ("`cat $k.dat`")
set j = `printf $line`
if ($j < 2) then
@low = $low +1
else if ($j > 2 and <3) then
@medium = $medium +1
else if ($j > 3) then
@high = $high +1
else
endif
end

echo "$k - $low $medium $high"
@k = $k +1
end

I get an error sayin "if: Badly formed number.
Could you please help?