For the last few weeks tr [:space:] isn't working the way it used to for me under Ubuntu 14.04. Instead of acting on spaces it acts on "a"s.: me@U:~$ echo "thisstring abcde what the heck?" | tr [:space:] '_' thisstring _bcde wh_t the heck? me@U:~$ This is 64 bit 14.04 built up from the mini.iso with just plain Openbox as the only DE, in lxterminal using bash. -- Securely sent with Tutanota. Claim your encrypted mailbox today! https://tutanota.com