Hi,
I have a 100 byte length fixed width file . In that three rows are broken and went off to next line. How can I identify the broken lines?

E.g.
ABCD1234MNRD4321

abcd1234mnrd
4321

As you can see in my example my second row with small case alphabets is broken and went off to next line. How can I identify the broken line.

If it is a "fixed width file" as you said, then you can identify the broken ones by the deviating number of characters in it.

The regexp:

.

.\{n\}

grep -v '^.\{n\}$' /path/to/inputfile

sed ': start
     s/\n//
     /^.\{n\}$/! {
          N
          b start
     }
     p' /path/to/inputfile

This should list the lines that are less than 100 characters in length:

while read line
do
  pos=`echo ${#line}`;
  if [ "$pos" -lt "100" ]; then
    echo $line;
  fi
done < test.txt

display all lines with less then 100 characters prefixed with the line number.

awk 'length($0)<100{print NR,$0}' foo.bar

One more ..

$ sed '/^.\{100\}/d' infile

Simple and perfect
thank you.