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Tip #95   Bash terminal size

Q: If I resize my xterm while another program is running, why doesn't bash notice the change?
http://cnswww.cns.cwru.edu/~chet/bash/FAQ (E11)

Bash won't get SIGWINCH if another process is in the foreground.
Enable checkwinsize so that bash will check the terminal size when
it regains control.

Put this in your bash config somewhere (e.g. Gentoo has it in /etc/bash/bashrc):

shopt -s checkwinsize