Capture can replay command line output

cap.sh

#!/bin/bash

capdir=/tmp/cap
mkdir -p "$capdir"

record() {
    tee "${capdir}/${1:-default}"
}

replay() {
    cat "${capdir}/${1:-default}"
}

case $1 in
    rec*)
        shift; record "$1"
        ;;
    rep*) shift; replay "$1"
        ;;
    *) cat >&2 <<EOF
    Usage:
    Capture output:
        cmd | cap record [capture name]
    Output previous capture:
      cap replay [capture name] | use output
EOF
exit 1
        ;;
esac