hr(){
    print ${(l:COLUMNS::=:)}
}

copy_img_to_usb(){
    if [[ $1 = "" ]]
    then
        return 1
    fi
    FILE=$1
    FILESIZE=$(stat -c%s  "$1")
    TARGET=$2
    lsblk
    echo "Are you sure you want to copy $FILE to $TARGET?"
    read
    if [[ $REPLY =~ ^[Yy]$ ]]
    then
        sudo umount $TARGET?*
        dd bs=4M if=$FILE | pv -s $FILESIZE | sudo dd of=$TARGET && sync
    fi
}

cdtemp(){
    local tmpfolder=$(mktemp -d)
    cd $tmpfolder
    aliasstring="change_dir $tmpfolder "
    #delete folder if cd out of it
    alias cd=$aliasstring
}

#belongs to the cdtemp function
change_dir(){
    #If no dir is specified go to home directory as expected
    if [[ $2 = "" ]]
    then
        cd
    else
        cd "$2"
    fi
    if [ ! $(expr match $(pwd) '\(/tmp/tmp.[a-zA-Z0-9]*\)') ] 
    then 
        echo "Deleting tmp folder $1." 
        rm -rf "$1"
        unalias cd 
    fi
}

#from arch wiki
pacman_disowned(){
    tmp=${TMPDIR-/tmp}/pacman-disowned-$UID-$$
    db=$tmp/db
    fs=$tmp/fs

    mkdir "$tmp"
    trap 'rm -rf "$tmp"' EXIT

    pacman -Qlq | sort -u > "$db"
    #I added:
    #/etc/ssl/certs
    #/usr/lib/python
    #/usr/share/mime
    find /bin /etc /sbin /usr \
      ! -name lost+found\
      ! -path "/etc/ssl/certs/*"\
      ! -path "/usr/lib/python*"\
      ! -path "/usr/share/mime/*"\
      \( -type d -printf '%p/\n' -o -print \) | sort > "$fs"

    comm -23 "$fs" "$db"
}