need to check the character length of each line

[sathis kumar]

Hello,

Requirement is:
1) each line should have a character count of 1825
2) If not then it should display the line no which is not having the count-1825

I have written a following script for that:
-------------------------------------------
count=1;
while read line
do
if [ ${#line} != 1825 ]
then
echo "Line No:$count length is not 1825" >> TEMPFILE
exit 99;
fi
count=`expr $count + 1`
done < testing

In the above case, 'testing' is the i/p file name and it has got around '876875' lines and so when I tried to execute the script, it is taking minimum of 10 minutes. Could you please let me know how the performance can be improved?

Thanks,
Sathish

[Eric SAUBIGNAC]

Bonjour,

You can do it in a more efficient way with basic program in C

Eric

[Matti_Kurkela]

How about this:

grep -nvE '^.{1825}$' filename | cut -d : -f 1

MK

[James R. Ferguson]

Hi Sathish:

Since you don't specify anything other than the generic "character":

# awk 'length!=1825' file

This excludes newline characters.

The following includes newline characters too:

# perl -ne 'print if length!=1826' file

Regards!

...JRF...

[Michael Mike Reaser]

sathis:>If not then it should display the line no which is not having the count-1825

JRF:> awk 'length!=1825' file

JRF, to fulfill sathis's second requirement, shouldn't the awk be something similar to

awk 'length!=1825{print $NR, $0}' file

or

awk 'length!=1825{print $NR}' file

?

[James R. Ferguson]

Hi (again) Sathis:

I missed the addition of the line-number on which the length isn't met (as Michael pointed out):

For 'awk':

# awk 'length!=1825{print NR,$0}' file

...notice that the record-number is 'NR" not '$NR'.

For Perl:

# perl -ne 'print "$. $_" if length!=1826' file

...which again we note _includes_ counting the newline character at the end of each line.

Regards!

...JRF...

[Fredrik.eriksson]

You can also use wc -m or wc --chars to count number of characters in a string.
so something like this might work:

if [ $(wc --chars ${#line}) -ne 1825 ]; then
echo "Line No:$count length is not 1825" >> TEMPFILE
fi

Best regards
Fredrik Eriksson