Code

# ============================================
# DEVOPS TERMINAL MANAGEMENT
# ============================================

# --- 1. TERMINAL MULTIPLEXERS ---

# Tmux basics
tmux new -s mysession          # Create new session
tmux attach -t mysession       # Attach to session
tmux detach                    # Detach from session (Ctrl+b, d)
tmux ls                        # List sessions
tmux kill-session -t mysession # Kill session

# Tmux key bindings (prefix: Ctrl+b)
# c       New window
# n/p     Next/previous window
# %       Split vertical
# "       Split horizontal
# o       Switch pane
# x       Kill pane
# [       Scroll mode (q to quit)

# Screen basics
screen -S mysession            # Create new session
screen -r mysession            # Reattach
screen -ls                     # List sessions
# Detach: Ctrl+a, d

# --- 2. SHELL CUSTOMIZATION ---

# .bashrc / .zshrc essentials
export HISTSIZE=100000
export HISTFILESIZE=200000
export HISTCONTROL=ignoredups:erasedups
export EDITOR=vim
export VISUAL=vim

# Useful aliases
alias ll='ls -alF --color=auto'
alias la='ls -A --color=auto'
alias l='ls -CF --color=auto'
alias ..='cd ..'
alias ...='cd ../..'
alias grep='grep --color=auto'
alias fgrep='fgrep --color=auto'
alias egrep='egrep --color=auto'
alias h='history'
alias ports='netstat -tulanp'
alias meminfo='free -h -l -t'
alias df='df -Th'
alias du='du -sh'

# Git aliases
alias gs='git status'
alias ga='git add'
alias gc='git commit'
alias gp='git push'
alias gl='git pull'
alias gd='git diff'
alias gco='git checkout'
alias gb='git branch'
alias glo='git log --oneline --graph'

# --- 3. REMOTE SERVER MANAGEMENT ---

# SSH essentials
ssh user@hostname
ssh -p 2222 user@hostname              # Custom port
ssh -i ~/.ssh/key.pem user@host        # Key-based auth
ssh -A user@host                       # Agent forwarding
ssh -L 8080:localhost:80 user@host     # Port forwarding
ssh -J jumpuser@jumphost user@target   # Jump host

# SSH config (~/.ssh/config)
# Host myserver
#     HostName 192.168.1.100
#     User admin
#     Port 2222
#     IdentityFile ~/.ssh/mykey
#     ServerAliveInterval 60
#     ServerAliveCountMax 3

# SSH agent
eval $(ssh-agent -s)
ssh-add ~/.ssh/id_rsa
ssh-add -l                              # List keys

# --- 4. CONTAINER TOOLS ---

# Docker shortcuts
alias d='docker'
alias dc='docker compose'
alias dps='docker ps --format "table {{.Names}}\t{{.Status}}\t{{.Ports}}"'
alias dlogs='docker logs -f'
alias dstats='docker stats'
alias dprune='docker system prune -af'
alias dexec='docker exec -it'

# Kubernetes shortcuts
alias k='kubectl'
alias kg='kubectl get'
alias kd='kubectl describe'
alias kdel='kubectl delete'
alias kaf='kubectl apply -f'
alias klogs='kubectl logs -f'
alias kexec='kubectl exec -it'
alias kctx='kubectl config current-context'
alias kns='kubectl config set-context --current --namespace'

# Watch resources
watch -n 1 kubectl get pods
watch -n 1 docker ps

# --- 5. LOG MONITORING ---

# tail / journalctl
tail -f /var/log/syslog
tail -f /var/log/nginx/access.log | grep ERROR
journalctl -u myservice -f
journalctl --since "1 hour ago"
journalctl -u myservice --since today --until "2 hours ago"

# Multi-file log tailing
multitail /var/log/nginx/access.log /var/log/nginx/error.log

# --- 6. PROCESS MANAGEMENT ---

# Process monitoring
ps aux | grep process_name
pgrep -f process_name
pkill -f process_name
lsof -i :8080                         # What's using port 8080
fuser -k 8080/tcp                     # Kill process on port

# System resources
htop                                    # Interactive process viewer
iotop                                   # I/O monitoring
nload                                   # Network load
iftop                                   # Network connections
dstat --cpu --mem --net --disk          # System stats
sar -u 1 10                             # CPU usage every 1s, 10 times

# --- 7. FILE OPERATIONS ---

# rsync for transfers
rsync -avz --progress /local/path user@host:/remote/path
rsync -avz --delete /source/ /dest/     # Sync with deletion

# tar archiving
tar -czvf archive.tar.gz /path/to/dir   # Create
tar -xzvf archive.tar.gz                # Extract
tar -tzvf archive.tar.gz                # List contents

# find
find /var/log -name "*.log" -mtime +7 -delete
find . -type f -size +100M
find / -type f -newer /tmp/reference_file

# --- 8. NETWORK TOOLS ---

# Quick checks
curl -I https://example.com             # Headers only
curl -o /dev/null -s -w "%{http_code}\n" https://example.com
nc -zv host port                        # Port check
ss -tuln                                # Listening sockets
ss -tulnp                               # With process names
dig +short example.com                  # DNS lookup
traceroute example.com                  # Route trace
mtr example.com                         # Advanced traceroute

# --- 9. TEXT PROCESSING ---

# jq for JSON
cat file.json | jq '.items[] | {name: .name, status: .status}'
kubectl get pods -o json | jq '.items[].metadata.name'

# yq for YAML
yq '.services.web.ports' docker-compose.yml
yq -i '.services.web.image = "nginx:latest"' docker-compose.yml

# Common pipelines
grep ERROR /var/log/app.log | awk '{print $1, $2, $5}' | sort | uniq -c | sort -rn
ps aux | awk '{print $2, $4, $11}' | sort -k2 -rn | head -20

# --- 10. SAFETY & BEST PRACTICES ---

# Safer rm
alias rm='rm -i'
# Or use trash-cli
# alias rm='trash-put'

# Confirm destructive operations
set -o noclobber                        # Prevent > overwrite
shopt -s histverify                     # Verify history expansion

# Exit on error in scripts
set -euo pipefail

# Dry runs
rsync -avzn --dry-run /source/ /dest/   # rsync dry run
terraform plan                            # Preview changes
kubectl diff -f manifest.yaml             # Preview k8s changes