cp w/ progress bar and time estimate

cppv.sh

#!/bin/bash

set -e

if [ $# -lt 2 ]; then
    echo "cppv - copy files with progress bar and rate limiting ability"
    echo "Usage: cppv source_file[s] destination_file_or_directory"
    echo "No other non-positional command line arguments can be given"
    echo "Always recurses like find"
    echo "You can change copying speed limit on the fly with \"pv -R\" if you find out pv's PID"
    echo "Use FIND_OPTS, PV_OPTS, CPIO_O_OPTS, CPIO_I_OPTS to override arguments to the pipeline parts"
    echo "Examples:"
    echo "    cppv a b # Copy file a to b. Just calls \"pv a > b\""
    echo "    cppv a d/ # Copy file a to d/a. Calls \"find a | cpio -o | pv | (cd d && cpio -i)\""
    echo "    cppv *{01..26}*.mkv /mnt/usb/ # Copy all matching files to /mnt/usb/."
    echo "    cppv dir1 dir2 # duplicate dir1"
    echo "    PV_OPTS=\"-L 1M\" cppv . /tmp/ # Limit copying rate to 1M"
    echo "    cppv /home/vi/bin /tmp/ # Warning: Copy /home/vi/bin to /tmp/home/vi/bin"
    exit 1
fi;

true ${CPIO_O_OPTS:="-H newc -0o"}
true ${CPIO_I_OPTS:="-0diu --no-absolute-filenames"}
true ${FIND_OPTS:="-depth -print0"}

ARGS=( "$@" );

DEST="${ARGS[$#-1]}"
unset ARGS[$#-1];

if [[ ( "${1:0:1}" == "-"  && ! -e "$1" ) || ( "${DEST:0:1}" == "-" && ! -e "$DEST" )  ]]; then
    echo "There should not be any command line options. Only file names." >&2
    exit 1;
fi

DIRMODE=0

if [[ $# > 2 || "${DEST:${#DEST}-1:1}" == "/" || -d $DEST ]]; then
    DIRMODE=1
elif [[ -d "$1" && ! -d "$2" ]]; then
    DIRMODE=1
    mkdir "$DEST";
    DEST=`readlink -f "$DEST"`;
    cd "$1";
    ARGS=(".")
fi

if [ $DIRMODE == 0 ]; then
    pv "$1" > "$2" && exit 0;
fi;

if [ ! -d "$DEST" ]; then
    echo Not a directory: "$DEST" >&2
    exit 1
fi

if [ "${1:0:1}" == "/" ]; then
    echo "Warning: it will do a bit different thing than usual cp" >&2
    echo "    For example, copying $1 to $DEST$1, not to $DEST/`basename $1`" >&2
fi

SIZE=`du -sb "${ARGS[@]}" | perl -ne '/^(\d+)/ and $q+=$1; END{print $q}'`

find "${ARGS[@]}" $FIND_OPTS | cpio $CPIO_O_OPTS | pv -s $SIZE $PV_OPTS | (cd "$DEST" && cpio $CPIO_I_OPTS)