sleep

sleep_until_modified.sh

#!/bin/bash

SCRIPTNAME=`basename "$0"`

print_help() {
    cat << EOF
Usage: $SCRIPTNAME filename
Uses 'inotifywait' to sleep until 'filename' has been modified.

Inspired by http://superuser.com/questions/181517/how-to-execute-a-command-whenever-a-file-changes/181543#181543

TODO: rewrite this as a simple Python script, using pyinotify
EOF
}


# parse_parameters:
while [[ "$1" == -* ]] ; do
    case "$1" in
        -h|-help|--help)
            print_help
            exit
            ;;
        --)
            #echo "-- found"
            shift
            break
            ;;
        *)
            echo "Invalid parameter: '$1'"
            exit 1
            ;;
    esac
done

if [ "$#" != 1 ] ; then
    echo "Incorrect parameters. Use --help for usage instructions."
    exit 1
fi

FULLNAME="$1"
BASENAME=`basename "$FULLNAME"`
DIRNAME=`dirname "$FULLNAME"`

coproc INOTIFY {
    inotifywait -q -m -e close_write,moved_to,create ${DIRNAME} &
    trap "kill $!" 1 2 3 6 15
    wait
}

trap "kill $INOTIFY_PID" 0 1 2 3 6 15

# BUG! Não vai funcionar com arquivos contendo caracteres estranhos
sed --regexp-extended -n "/ (CLOSE_WRITE|MOVED_TO|CREATE)(,CLOSE)? ${BASENAME}\$/q" 0<&${INOTIFY[0]}