Shell Programming and Scripting

While we always encourage here to show the efforts and at least start trying something. This is the way to learn and also it will give us the feeling that we are not doing your work instead we are here to help you to get your work done.

Did you manage to look at the man pages I have posted earlier? Can you think the way you can use those commands to extract the first 100 lines and last 33 lines?

You can read the file with

Code:

while read eachline
do
 ## do your stuff with $eachline
done < your_file

You can apply your logic with incremental variable or something.
Think towards your solution.

It could even be done without read with just the commands that clx suggested.. Is this homework?

yup head and tail command is working well for tis thank you

---------- Post updated at 05:43 AM ---------- Previous update was at 05:10 AM ----------

the head and tail for the firest and the last file is is working is uing the harcoding of the records but for the remaining it is not

For the remaining you can use split. Can you show us what you tried so far?

yup

Code:

head -n 33 filename.csv > new1.csv
while  read line
split filename.csv 
done <filename.csv
tail -n 100 filename.csv

Hi, you cannot read and write to the same file at the same time like that.

Try something like:

Code:

{ n=0
  while IFS= read -r line && [ $(( n+=1 )) -le 100 ]
  do
    printf "%s\n" "$line"
  done
  split -l1000 - outfile
} < infile > outfilea0

--
It seems a while read loop was used after all

it works using for loop as well
can u suggest me to split using the comand line arguments