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bashshellstdinsysin

shell script does not read last line from sysin

I try to get some data from sysin and here is my problem: if data are directed from a file, then the last line is not read. Example of text file:

line1
line2
line3

My code:

#!/bin/bash
while read line
do
  echo "$line"
done

And output:

$ ./test.sh < data.txt
line1
line2

If I write down at the end of my file null string output correct. But I don`t like it. How to fix this?

Solution

  • If you need desperately to read files without EOL in the end, then you may check whether returned string is empty or not instead of checking read exit status:

    #!/bin/bash
while true; do
  line=''
  read line
  if [ -z "$line" ]; then
    break
  fi
  echo "$line"
done