Search code examples
linuxunixsedtr

UNIX: using tr to delete empty lines

I've seen it being done using sed (if you'd be so kind to write how to do it in sed and explain the regex behind it, I will appreciate it too), but I'd like to know how to do it using tr.

My idea was: cat file|tr -d ^'\n' or ^\n, but the first one deleted every '\n', the second one none.

Solution

  • tr on linux, at least, can squeeze repeated characters:

    echo -ne $a
the quick
brown fox

jumps over
echo -ne $a |tr -s '\n'
the quick
brown fox
jumps over