Convert Bash history to Zsh history

bash-to-zsh-hist.py

#!/usr/bin/env python
# -*- coding: utf-8 -*-
# 
# This is how I used it:
# $ cat ~/.bash_history | python bash-to-zsh-hist.py >> ~/.zsh_history

import sys
import time


def main():
    timestamp = None
    for line in sys.stdin.readlines():
        line = line.rstrip('\n')
        if line.startswith('#') and timestamp is None:
            t = line[1:]
            if t.isdigit():
                timestamp = t
                continue
        else:
            sys.stdout.write(': %s:0;%s\n' % (timestamp or time.time(), line))
            timestamp = None


if __name__ == '__main__':
    main()

Armbian 21.02.3 Focal (Orange Pi) worked! Thanks!

works well on ubuntu 20.04

🙏

Works fine on Manjaro! Thanks!

THANK YOU FOR THIS!!!

Working on Debian 11 (stock) python, either run the script as:

cd ~/ && cp .bash_history .bash_history.bak && cat ~/.bash_history | python3 bash-to-zsh-hist.py >> ~/.zsh_history

Or, symlink python3 > python:

sudo ln -s /usr/bin/python3.9 /usr/bin/python
cat ~/.bash_history | python bash-to-zsh-hist.py >> ~/.zsh_history

nice, worked like a charm on my new MacBook Pro. 👍 thank you

Perfect. Thanks!

thanks, worked on a new M1 MBP

Thanks, worked on Catalina with python 2.7.16

To get it to work with hstr, I had to use int(time.time())
Thanks for saving my history!!

On WSL had pretty big history and was using HSTR, so after importing the history had 2 problems:

1. Error zsh: corrupt history file /home/user/.zsh_history
2. HSTR showing timestamps
   So the solution for me was modified script with thanks to @Zackhardtoname and then several additional steps:
3. Write date to some other file .zsh_history_tmp
4. strings .zsh_history_tmp > .zsh_history
5. fc -R .zsh_history

Works fine in Ubuntu 22.04, thanks for it!

Works fine in Linux Mint Debian Edition 5 (LMDE 5). Thank you.

Works fine on RockyLinux 9 (Workstation) with zsh 5.8, ohmyzsh and python3.9.10.
Many thx. Great timesaver!

Merci!

if zsh_history format is
: 1670471184:0;cat ~/.zsh_history
need use int(time.time()) at line 21

Thanks!

Thanks

gracias!!!

Worked for me, thanks.

Thanks!!! Helped a lot!

Worked like a charm !! Thank you 👍
Wondering why zsh framework doesn't have a feature to import the bash history as part of initial setup. 🤔

Thank you!!

Thanks!

Worked perfectly. Thanks

If you have UnicodeEncodeError:

    lines = []
    with open("/home/mmatrosov/.bash_history", "rb") as f:
        while bytes := f.readline():
            lines.append(bytes.decode("ascii", "backslashreplace"))

hero of my day

thanks!

Updating the code to add bash history before zsh history.
I also code a function to joint bash command compound with \n (enter), like bash loops or ctrl+v command.

from sys import stdin, stdout

TIMESTAMP_FIRST_ZSH_CMD = 1737556882

def treat_enter(lines):
    fixed_lines = []
    full_cmd = ""
    count = 0
    while count < len(lines):
        full_cmd += lines[count].strip()
        if count == len(lines) - 1 or not lines[count+1].startswith(" ") or not lines[count].endswith("\n"):
            fixed_lines.append(full_cmd)
            full_cmd = ""
        count += 1
    return fixed_lines

def main():
    lines = stdin.readlines()
    # print(f"Before Treat: {len(lines)} lines")
    lines = treat_enter(lines)
    # print(f"After Treat: {len(lines)} lines")
    count_tt = TIMESTAMP_FIRST_ZSH_CMD - len(lines)
    for line in lines:
        line = line.rstrip('\n')
        stdout.write(": %s:0;%s\n" % (count_tt, line))
        count_tt += 1

if __name__ == "__main__":
    main()

To use this command:

Update the TIMESTAMP_FIRST_ZSH_CMD code variable with timestamp of the oldest zsh command.

cat ~/.bash_history | python3 code.py > ~/.zsh_history_new && cat ~/.zsh_history >> ~/.zsh_history_new

The file ~/.zsh_history_new will be created.