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This is what I came up with and I am happy with it so far...

alias hfix='history -n && history | sort -k2 -k1nr | uniq -f1 | sort -n | cut -c8- > ~/.tmp$$ && history -c && history -r ~/.tmp$$ && history -w && rm ~/.tmp$$'  
HISTCONTROL=ignorespace  
shopt -s histappend  
shopt -s extglob  
HISTSIZE=1000  
HISTFILESIZE=2000  
export HISTIGNORE="!(+(*\ *))"  
PROMPT_COMMAND="hfix; $PROMPT_COMMAND" 

NOTES:

• Yes, it is complicated... but, it removes all duplicates and yet preserves chronology within each terminal!
• my HISTIGNORE ignores all commands that don't have arguments. This may not be desireable by some folks and can be left out.

This is what I came up with and I am happy with it so far…

alias hfix='history -n && history | sort -k2 -k1nr | uniq -f1 | sort -n | cut -c8- > ~/.tmp$$ && history -c && history -r ~/.tmp$$ && history -w && rm ~/.tmp$$'  
HISTCONTROL=ignorespace  
shopt -s histappend  
shopt -s extglob  
HISTSIZE=1000  
HISTFILESIZE=2000  
export HISTIGNORE="!(+(*\ *))"  
PROMPT_COMMAND="hfix; $PROMPT_COMMAND" 

NOTES:

• Yes, it is complicated... but, it removes all duplicates and yet preserves chronology within each terminal!
• My HISTIGNORE ignores all commands that don't have arguments. This may not be desirable by some folks and can be left out.

This is what I came up with and I am happy with it so far...

alias hfix='history -n && history | sort -k2 | uniq -f1 | sort -n | cut -c8- > ~/.tmp$$ && history -c && history -r ~/.tmp$$ && history -w && rm ~/.tmp$$'  
HISTCONTROL=ignorespace  
shopt -s histappend  
shopt -s extglob  
HISTSIZE=1000  
HISTFILESIZE=2000  
export HISTIGNORE="!(+(*\ *))"  
PROMPT_COMMAND="hfix; $PROMPT_COMMAND" 

NOTES:

• Yes, it is complicated... but, it removes all duplicates and yet preserves chronology within each terminal!
• my HISTIGNORE ignores all commands that don't have arguments. This may not be desireable by some folks and can be left out.

This is what I came up with and I am happy with it so far...

alias hfix='history -n && history | sort -k2 -k1nr | uniq -f1 | sort -n | cut -c8- > ~/.tmp$$ && history -c && history -r ~/.tmp$$ && history -w && rm ~/.tmp$$'  
HISTCONTROL=ignorespace  
shopt -s histappend  
shopt -s extglob  
HISTSIZE=1000  
HISTFILESIZE=2000  
export HISTIGNORE="!(+(*\ *))"  
PROMPT_COMMAND="hfix; $PROMPT_COMMAND" 

NOTES:

• Yes, it is complicated... but, it removes all duplicates and yet preserves chronology within each terminal!
• my HISTIGNORE ignores all commands that don't have arguments. This may not be desireable by some folks and can be left out.

This is what I came up with and I am happy with it so far...

alias hfix='history -n && history | sort -k2 | uniq -f1 | sort -n | cut -c8- > ~/.tmp$$ && history -c && history -r ~/.tmp$$ && history -w && rm ~/.tmp$$'  
HISTCONTROL=ignorespace  
shopt -s histappend  
HISTSIZE=1000  
HISTFILESIZE=2000  
#export HISTIGNORE="&:[^ \t]*"  
PROMPT_COMMAND="hfix; $PROMPT_COMMAND" 

NOTES:

• Yes, it is complicated... but, it removes all duplicates and yet preserves chronology within each terminal!
• my HISTIGNORE ignores all commands that don't have arguments. This may not be desireable by some folks and can be left out. **BUMMER: better leave this out. It doesn't work! Anyone know why?

This is what I came up with and I am happy with it so far...

alias hfix='history -n && history | sort -k2 | uniq -f1 | sort -n | cut -c8- > ~/.tmp$$ && history -c && history -r ~/.tmp$$ && history -w && rm ~/.tmp$$'  
HISTCONTROL=ignorespace  
shopt -s histappend  
shopt -s extglob  
HISTSIZE=1000  
HISTFILESIZE=2000  
export HISTIGNORE="!(+(*\ *))"  
PROMPT_COMMAND="hfix; $PROMPT_COMMAND" 

NOTES:

• Yes, it is complicated... but, it removes all duplicates and yet preserves chronology within each terminal!
• my HISTIGNORE ignores all commands that don't have arguments. This may not be desireable by some folks and can be left out.