# Avoid duplicates, ignore two characters commands and those ones which starts with
# a space. Preserve history in multiple terminal windows.
export HISTCONTROL=ignoredups:erasedups
export HISTCONTROL=ignoreboth
export HISTCONTROL=ignorespaces
export HISTIGNORE=??
# After each command, append to the history file and reread it
export PROMPT_COMMAND="${PROMPT_COMMAND:+$PROMPT_COMMAND$'\n'}history -a; history -c; history -r"
shopt -s histappend
shopt -s checkwinsize