#!/bin/bash
# sample-crlf.sh: a shell script saved with Windows (CRLF) line endings.
# Free sample from 99helpers.com/file-types/sh
# DELIBERATELY BROKEN, for testing. Every line ends in an invisible carriage
# return (\r) before the newline, which shells treat as part of the line.
#
# ./sample-crlf.sh  fails: the system looks for an interpreter called
#                   "/bin/bash\r". Depending on the shell you see
#                   "/bin/bash^M: bad interpreter: No such file or directory"
#                   or "cannot execute: required file not found".
# bash sample-crlf.sh  runs, with symptoms: the empty line 15 gives
#                   "$'\r': command not found", and every value picks up a \r.
# Fix: dos2unix sample-crlf.sh, or  sed -i 's/\r$//' sample-crlf.sh  (GNU sed),
#      or switch the line endings to LF in your editor.

name="Ada"
echo "Hello, $name!"
echo "The line above should read 'Hello, Ada!'. If it shows '!ello, Ada',"
echo "the carriage return stored in \$name sent the cursor back to the start."
printf 'Length of name: %s (Ada has 3 letters)\n' "${#name}" # a comment swallows the \r