dtrx

#!/bin/sh
#
# NAME
#
#   dtrx - extract archives
#
# SYNOPSIS
#
#   dtrx <file>...
#
# DESCRIPTION
#
#   Extract archives of different formats.  Named after the similar,
#   more featureful, Python script called "Do The Right Extraction".  7z
#   (from the Debian package p7zip-full) can also extract archives of
#   different formats.  But 7z is not always available, ergo this
#   script.
#
# DEPENDENCIES
#
#   GNU tar(1), unzip(1), 7z(1), ar(1), unrar(1)
#
# SEE ALSO
#
#   dtrx (https://brettcsmith.org/2007/dtrx/)
#

[ "$*" ] || {
    echo >&2 "usage: ${0##*/} <file>..."
    exit 1
}

for arg
do
    if [ -f "$arg" ]
    then
        # 7z can extract almost all kinds of files, but use 7z as a last
        # resort since it is not always installed.
        case "$arg" in
            *.ar|*.deb)
                ar xv "$arg" ;;
            *.rar)
                unrar x "$arg" ;;
            *.zip)
                unzip "$arg" ;;
            *)
                # If it is not an extension we do not recognize, try
                # extracting it using GNU tar, or if that fails, use 7z.
                if tar atvf "$arg" >/dev/null 2>&1
                then
                    tar axvf "$arg"
                else
                    7z x "$arg"
                fi
                ;;
        esac
    else
        echo >&2 "${0##*/}: '$arg' is not a valid file!"
    fi
done