How to add 100 spaces at end of each line of a file in Unix

Question

I have a file which is supposed to contain 200 characters in each line. I received a source file with only 100 characters in each line. I need to add 100 extra white spaces

Answer 1

Just in case you are looking for a bash solution,

while IFS=  read -r line
    do
    printf "%s%100s\n" "$line" 
done < file > newfile

---

Test

Say I have a file with 3 lines it it as

$ wc -c file
      16 file
$ wc -c newfile
     316 newfile

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Original Answer

spaces=$(echo {1..101} | tr -d 0-9)
while read line
    do
    echo -e "${line}${spaces}\n" >> newfile
done < file