# Show all history
history

# Show last 20 commands
history 20

# Show history with timestamps (if configured)
history

  1  ls -la
  2  cd /var/log
  3  grep error app.log
  4  vim config.txt
  5  history

# Search backwards (Ctrl+R)
# Type Ctrl+R, then start typing your search term

# Search forward (Ctrl+S)
# May need to disable flow control first: stty -ixon

# Show all commands containing "git"
history | grep git

# Show last 50 commands containing "docker"
history 50 | grep docker

# Repeat last command
!!

# Repeat last command with sudo
sudo !!

# Execute command #42 from history
!42

# Execute last command starting with "git"
!git

# Execute last command containing "docker"
!?docker

# Use arguments from previous command
cp file.txt backup/
ls !$  # !$ = last argument (backup/)

# Use all arguments from previous command
mv file1.txt file2.txt /backup/
ls !*  # !* = all arguments

# In ~/.bashrc or ~/.bash_profile
export HISTSIZE=10000  # Default is usually 500

# In ~/.bashrc or ~/.bash_profile
export HISTFILESIZE=20000  # Default is usually 500

# Default: ~/.bash_history
export HISTFILE=~/.bash_history

# Use custom location
export HISTFILE=~/.my_custom_history

# Ignore duplicate commands
export HISTCONTROL=ignoredups

# Ignore commands starting with space
export HISTCONTROL=ignorespace

# Combine both
export HISTCONTROL=ignoreboth

# Ignore duplicates and erase older duplicates
export HISTCONTROL=erasedups

# Don't save ls, pwd, exit, or history commands
export HISTIGNORE="ls:pwd:exit:history"

# Ignore multiple patterns
export HISTIGNORE="ls:cd:pwd:exit:date:* --help"

# Add timestamps to history
export HISTTIMEFORMAT="%F %T "  # Format: YYYY-MM-DD HH:MM:SS

# Custom format
export HISTTIMEFORMAT="%d/%m/%y %T "  # Format: DD/MM/YY HH:MM:SS

  1  2024-12-25 10:30:15 ls -la
  2  2024-12-25 10:31:42 cd /var/log
  3  2024-12-25 10:32:18 grep error app.log

# History Configuration
# =====================

# Increase history size
export HISTSIZE=50000
export HISTFILESIZE=100000

# Add timestamps
export HISTTIMEFORMAT="%F %T "

# Avoid duplicates
export HISTCONTROL=ignoredups:erasedups

# Ignore common commands
export HISTIGNORE="ls:ll:cd:pwd:exit:date:clear:history"

# Append to history file, don't overwrite
shopt -s histappend

# Save multi-line commands as one command
shopt -s cmdhist

# Save history after each command (not just on exit)
PROMPT_COMMAND="history -a; history -c; history -r; $PROMPT_COMMAND"

# Add to ~/.bashrc
shopt -s histappend
PROMPT_COMMAND="history -a; history -c; history -r"

# Add to ~/.bashrc
export HISTSIZE=-1
export HISTFILESIZE=-1

# Add to ~/.bashrc
function cd() {
    builtin cd "$@"
    export HISTFILE=~/.bash_history_$(pwd | sed 's/\//_/g')
}

#!/bin/bash
# Add to crontab: 0 0 * * * /path/to/backup_history.sh

DATE=$(date +%Y%m%d)
cp ~/.bash_history ~/.bash_history_backup_$DATE

# Keep only last 30 days of backups
find ~/.bash_history_backup_* -mtime +30 -delete

# Install fzf first: https://github.com/junegunn/fzf

# Add to ~/.bashrc
# Ctrl+R for fuzzy history search
bind '"\C-r": "\C-x1\e^\er"'
bind -x '"\C-x1": __fzf_history'

__fzf_history() {
    READLINE_LINE=$(history | fzf --tac --tiebreak=index | sed 's/^ *[0-9]* *//')
    READLINE_POINT=${#READLINE_LINE}
}

# Clear current session history
history -c

# Delete specific entry (e.g., entry #42)
history -d 42

# Clear history file
cat /dev/null > ~/.bash_history

# Clear both memory and file
history -c && history -w

# Write current session to history file
history -w

# Append current session to history file
history -a

# Read history file into current session
history -r

# Find that long docker command you ran yesterday
history | grep docker | grep compose

# Then execute it
!1234  # Use the number from history

# Most used commands
history | awk '{print $2}' | sort | uniq -c | sort -rn | head -10

# Commands run today
history | grep "$(date +%Y-%m-%d)"

# Find frequently used commands
history | awk '{print $2}' | sort | uniq -c | sort -rn | head -5

# Create aliases for them in ~/.bashrc
alias gs='git status'
alias gp='git pull'
alias dc='docker-compose'

# If you accidentally cleared terminal
history | tail -20

# If terminal crashed
cat ~/.bash_history | tail -50

# In ~/.zshrc

# History file location
HISTFILE=~/.zsh_history

# History size
HISTSIZE=50000
SAVEHIST=100000

# Options
setopt EXTENDED_HISTORY          # Write timestamp
setopt HIST_EXPIRE_DUPS_FIRST    # Expire duplicates first
setopt HIST_IGNORE_DUPS          # Don't record duplicates
setopt HIST_IGNORE_SPACE         # Ignore commands starting with space
setopt HIST_VERIFY               # Show command before executing from history
setopt SHARE_HISTORY             # Share history between sessions

# Start command with space (if HISTCONTROL=ignorespace)
 mysql -u root -p secret_password

# Or temporarily disable history
set +o history
# Run sensitive commands
mysql -u root -p secret_password
set -o history  # Re-enable

# Remove specific command
history -d 1234

# Edit history file directly
vim ~/.bash_history

# Encrypt
gpg -c ~/.bash_history

# Decrypt when needed
gpg -d ~/.bash_history.gpg > ~/.bash_history

# View history
history              # All history
history 20           # Last 20 commands

# Search
Ctrl+R               # Reverse search
history | grep term  # Grep search

# Execute
!!                   # Last command
!42                  # Command #42
!git                 # Last command starting with "git"

# Configuration (~/.bashrc)
export HISTSIZE=50000
export HISTFILESIZE=100000
export HISTTIMEFORMAT="%F %T "
export HISTCONTROL=ignoreboth
export HISTIGNORE="ls:cd:pwd:exit"
shopt -s histappend

# Management
history -c           # Clear session
history -w           # Write to file
history -d 42        # Delete entry #42