Identify changes to a filesystem

.bash_functions

#!/bin/bash

# Identify changes to a filesystem
fsdiff(){
    (
        defaultdirs=(.)
        localdirs=("$HOME")
        systemdirs=(/etc /home /opt /root /usr /var)

        if (( $# == 0 )); then
            watchdirs=("${defaultdirs[@]}")
        elif (( $# == 1 )) && [[ $1 =~ ^(-h|--help)$ ]]; then
            cat <<-EOF
			Usage: ${FUNCNAME[0]} [OPTION]

			Identify changes to a filesystem

			  -l, --local            checks: ${localdirs[*]}
			  -s, --system           checks: ${systemdirs[*]}

			By default, check current directory for changes.
			EOF
            return 0
        elif (( $# == 1 )) && [[ $1 =~ ^(-l|--local)$ ]]; then
            watchdirs=("${localdirs[@]}")
        elif (( $# == 1 )) && [[ $1 =~ ^(-s|--system)$ ]]; then
            watchdirs=("${systemdirs[@]}")
        else
            error "Invalid command"
            return 1
        fi

        hashall(){
            find "${watchdirs[@]}" ! -type d ! -path "$HOME/.cache/*" ! -path "$HOME/.lastpass/*" ! -path "$HOME/.local/share/Trash/*" ! -path "$HOME/.macromedia/*" ! -path "$HOME/.mozilla/*" ! -path "$HOME/.thumbnails/*" ! -path "$HOME/Downloads/*" -print0 2>/dev/null| sort -z | xargs -0r -- md5sum 2>/dev/null
        }

        before=$(hashall)
        read -n 1 -p 'Continue? '
        echo
        [[ $REPLY != [Yy] ]] && return 0
        after=$(hashall)
        diff -c <(echo "$before") <(echo "$after") | sed 's/ [0-9a-z]\{32\} //' | sort -u | awk '/^+ / {sub("^+ ", ""); added[a++]=$0} /^- / {sub("^- ", ""); removed[r++]=$0} /^\! / {sub("^! ", ""); modified[m++]=$0} END{if (length(added)>0) {print "ADDED"; for (line in added) print added[line]; print ""} if (length(removed)>0) {print "REMOVED"; for (line in removed) print removed[line]; print ""} if (length(modified)>0) {print "MODIFIED"; for (line in modified) print modified[line]; print ""}}'
    )
}