Shell Programming and Scripting

logfile1
logfile2
logfile3
logfile....n

var1=`cat logfile1 | wc -l`  Iteration1 1st minute
var2=`cat logfile1 | wc -l`  Iteration2 2nd minute
var3=`cat logfile1 | wc -l`  Iteration3 3rd minute
var4=`cat logfile1 | wc -l`  Iteration4 4th minute
var1a=`cat logfile2 | wc -l`  Iteration1 1st minute
var2a=`cat logfile2 | wc -l`  Iteration2 2nd minute
var3a=`cat logfile2 | wc -l`  Iteration3 3rd minute
var4a=`cat logfile2 | wc -l`  Iteration4 4th minute

for line in FILE1
do
cat line | wc -l > tmp
echo "the number of lines in ${line} are ${tmp} >> output_file
done

message if word-count-lines is same for 1minute X 4 iterations

#! /bin/sh 
for file in *.log
do
wc -l >> "${file}.record" < "$file"
num=$(tail -4 "${file}".record | uniq | wc -l)
[ $num = 1 ] && echo "Alert! ${file} Unchanged for 4 minutes!"
done

for i in *.record
do
newrecord=$(tail -4 $i)
echo "$newrecord" > $i
done

# echo "blah blah" | tee -a file2.log file.log
blah blah
# ./test
# ./test
# ./test
# ./test
Alert! file.log Unchanged for 4 minutes!
Alert! file2.log Unchanged for 4 minutes!
#