Remove Duplicate zsh History

migrate_from_exist_hitory.sh

cat -n .zsh_history | sort -t ';' -uk2 | sort -nk1 | cut -f2- > .zhistory

to_zshrc

#
# Sets history options.
#
# Authors:
#   Robby Russell <[email protected]>
#   Sorin Ionescu <[email protected]>
#

HISTFILE="$HOME/.zhistory"
HISTSIZE=10000000
SAVEHIST=10000000

setopt BANG_HIST                 # Treat the '!' character specially during expansion.
setopt EXTENDED_HISTORY          # Write the history file in the ":start:elapsed;command" format.
setopt INC_APPEND_HISTORY        # Write to the history file immediately, not when the shell exits.
setopt SHARE_HISTORY             # Share history between all sessions.
setopt HIST_EXPIRE_DUPS_FIRST    # Expire duplicate entries first when trimming history.
setopt HIST_IGNORE_DUPS          # Don't record an entry that was just recorded again.
setopt HIST_IGNORE_ALL_DUPS      # Delete old recorded entry if new entry is a duplicate.
setopt HIST_FIND_NO_DUPS         # Do not display a line previously found.
setopt HIST_IGNORE_SPACE         # Don't record an entry starting with a space.
setopt HIST_SAVE_NO_DUPS         # Don't write duplicate entries in the history file.
setopt HIST_REDUCE_BLANKS        # Remove superfluous blanks before recording entry.
setopt HIST_VERIFY               # Don't execute immediately upon history expansion.
setopt HIST_BEEP                 # Beep when accessing nonexistent history.

migrate_from_exist_hitory.sh version worked for me:

awk '{\
  if (NR == 1) {\
    print ": " NR ":0;" $0\
  } else if (prev_line_ends_with_backslash) {\
    print $0\
  } else {\
    print ": " NR ":0;" $0\
  }\
  prev_line_ends_with_backslash = (substr($0, length($0), 1) == "\\")\
}' ~/.zsh_history > .zhistory