How to convert DOS/Windows newline (CRLF) to Unix newline (LF) in a Bash script?

Question

How can I programmatically (i.e., not using `vi`) convert DOS/Windows newlines to Unix? The `dos2unix` and `unix2dos` commands are not available on certain systems. How can I emulate these with commands like `sed`/`awk`/`tr`?

Answer 1

tr -d '\r' < infile > outfile

please use DIFFERENT filenames for infile and outfile