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I'm a big fan of peco to interactively grep lists, so here come a few of mines:

# pecohist show your command history and let you grep them, then copy your selection to your clipboard
alias hist="history | cut -c 8-"
pecohist() {
  cmd=$(hist | peco | tr -d '\n')
  $(echo $cmd | pbcopy)
  echo $cmd
}

If you're using AWS a lot, ec2-cssh (I'm working on improving it, but it's already such a time saver) will let you list your ec2 instances (with their IPs, ids and tags) and automatically ssh into them, with a default key or the one you specify in args (requires aws cli, peco, jq)

function list_ec2s() {
    local jq_query='.Reservations[] | .Instances[] | select(.State.Name != "terminated") | select(has("PublicIpAddress")) | [.PublicIpAddress,.PrivateIpAddress,.State.Name,(.Tags[] | select(.Key == "Name") | .Value // "")] | join("\t")'

    aws ec2 describe-instances | jq -r $jq_query | peco
}

# Requires aws-cli, peco, jq and tmux-cssh (brew install it)
function ec2-cssh() {
    local ssh_user=$2
    local ssh_key=$1
    local ip_addresses

    # Default user
    if [ -z ${ssh_user:+x} ]; then ssh_user="ec2-user"; fi
    # Default key
    if [ -z ${ssh_key:+y} ]; then ssh_key="~/.ssh/my_key.pem"; fi

    ip_addresses=$(list_ec2s | awk '{ print $1 }' | tr '\n' ' ')

    if [ -n $ip_addresses ]; then
        echo "ssh  -i ${ssh_key} ${ssh_user}@${ip_addresses}"
        #sh -c "ssh  -i $ssh_key ${ssh_user}@${ip_addresses}"
        sh -c "tmux-cssh -u $ssh_user -i $ssh_key $ip_addresses"

    fi
}

Easily display markdown in your console (when you're just looking for a sample command you know there, super easy to get it.... it's a man-like-formated markdown export displayed in less

# Markdown utilities (requires `brew install pandoc`)
function mdless () {
  local mdfile=$1
  if [ -z ${mdfile:+x} ]; then mdfile="README.md"; fi
  case $mdfile in
      -h | --help)
        print "mdless usage: 'mdless myfile.md' or 'mdless' (defaults to README.md)"
      ;;
      *)
        mdcat $mdfile | less
      ;;
  esac
}

function mdcat () {
  local mdfile=$1
  if [ -z ${mdfile:+x} ]; then mdfile="README.md"; fi
  pandoc -s -f markdown -t man $mdfile | groff -T utf8 -man
}

If you're like me and have a tons of commands in the scripts node of your package.json, then list them to display an interactive list, and copy a npm run command of the selected one to your clipboard:

function npm_run(){
  $(echo npm run $(cat package.json | jq -r '.scripts | keys' | grep '"' | sed  's/[",]//g' | peco | tr -d '\n' ) | pbcopy)
  echo `pbpaste`
}