mkdir target_dir; cd target_dir; tar xvzf ../the_bomb_file.tar.gz; cd ..

#!/bin/sh
# use 7z and tar to extract arhives, and Xdialog for gui

newdir="$(echo "$@" | rev | cut -d. -f1 --complement | rev)"

error() # error
{
	Xdialog --title "Error" --msgbox "$1" 0 0
	exit 1
}

success() # directory
{
	# make sure archive doesn't make a mess
	name="$(ls -1A "$1")"
	if test "$(echo "$name" | wc -l)" = 1
	then
		if test -e "$1/../$name"
		then
			if test "$name" = "$(basename "$1")"
			then
				if test ! -e "$1-$$"
				then
					mv "$1" "$1-$$" && mv "$1-$$/$name" "$1-$$/.." && rmdir "$1-$$"
				fi
			fi
		else
			mv "$1/$name" "$1/.." && rmdir "$1"
		fi
	fi
	Xdialog --title "Success" --msgbox "Extraction successful" 5 30
	exit 0
}

extract() # archive outputdir
{
	# try to extract the archive first
	if 7z x "-o$2" "$1"
	then
		success "$2"
	else
		# we reach here if archive is encrypted, or broken, or an incomplete part
		pass=-p"$(Xdialog --stdout --password --title "Archive password" --inputbox "Enter archive password:" 8 30 | grep -o '\<.*\>')"
		if test "$pass" != '-p'
		then
			# extract encrypted archive using password
			if 7z x "-o$2" "-y" "$pass" "$1"
			then
				success "$2"
			elif test "$(du -s "$2" | awk '{ print $1 }')" = 0
			then
				rm -rf "$2"
				error "Bad password"
			else
				error "Broken archive"
			fi
		else
			# clicking cancel and incomplete part archive lead here
			if test "$(du -s "$2" | awk '{ print $1 }')" = 0
			then
				rm -rf "$2"
			fi
			exit 1
		fi
	fi
}

mkorfail() # directory
{
	if ! mkdir "$1"
	then
		error "$1 exists"
	fi
}

# handle tar archives first
if 7z l "$@" | grep 'Type = tar'
then
	mkorfail "$newdir"
	if tar -C "$newdir" -xf "$@"
	then
		success "$newdir"
	else
		error "Broken archive"
	fi
fi

# handle lzip archives next
if test '0000000 114 132 111 120' = "$(od -N4 -b "$@" | head -n1)"
then
	if echo "$newdir" | grep '\.tar$'
	then
		newdir="$(echo "$newdir" | sed 's|\.tar$||')"
	fi
	mkorfail "$newdir"
	# assume it contains a tar
	if plzip -cd "$@" | tar -C "$newdir" -xf -
	then
		success "$newdir"
	else
		# it may not contain a tar
		if plzip -cd "$@" > "$newdir/$(basename "$newdir")"
		then
			success "$newdir"
		else
			# it is corrupt so try to fix it
			if lziprecover -R "$@"
			then
				error "Broken archive has been fixed so check it"
			else
				error "Broken archive"
			fi
		fi
	fi
fi

# handle all other archive types
if 7z l "$@" | tail -n 1 | grep '1 files, 0 folders'
then
	if 7z l "$@" | tail -n 3 | head -n 1 | awk '{ print $NF }' | grep '\.tar$'
	then
		# it contains a tar, assume no password, check and fix newdir name
		if echo "$newdir" | grep '\.tar$'
		then
			newdir="$(echo "$newdir" | sed 's|\.tar$||')"
		fi
		mkorfail "$newdir"
		if 7z x -so "$@" | tar -C "$newdir" -xf -
		then
			success "$newdir"
		elif test "$(du -s "$newdir" | awk '{ print $1 }')" = 0
		then
			extract "$@" "$newdir"
		else
			error "Broken archive"
		fi
	else
		mkorfail "$newdir"
		extract "$@" "$newdir"
	fi
else
	mkorfail "$newdir"
	extract "$@" "$newdir"
fi

#!/bin/sh
# use 7z and tar to create arhives, and Xdialog for gui

success()
{
	Xdialog --title "Success" --msgbox "Compression successful" 5 30
	exit 0
}

error() # error
{
	Xdialog --title "Error" --msgbox "$1" 0 0
	exit 1
}

# file or directory
if test -f "$@"
then
	format="$(Xdialog --stdout --title "Compress file" --menu "Choose compression:" 0 0 0 "lz" "lzip" "gz" "gzip" "bz2" "bzip2" "xz" "xz" "7z" "7zip (no pass)" "7z-pass" "7zip (with pass)" "zip" "zip (no pass)" "zip-pass" "zip (with pass)")"
elif test -d "$@"
then
	format="$(Xdialog --stdout --title "Compress directory" --menu "Choose compression:" 0 0 0 "tlz" "tar.lzip" "tgz" "tar.gzip" "tbz" "tar.bzip2" "txz" "tar.xz" "7z" "7zip (no pass)" "7z-pass" "7zip (with pass)" "zip" "zip (no pass)" "zip-pass" "zip (with pass)")"
else
	error "Cannot compress input"
fi

if test -e "$@.$format"
then
	error "$@.$format exists"
else
	case "$format" in
	tlz)
		if tar -C "$@/.." -cf - "$(basename "$@")" | plzip > "$@.$format"
		then
			success
		else
			error "Compression failed"
		fi
	;;
	lz)
		if plzip -k "$@"
		then
			success
		else
			error "Compression failed"
		fi
	;;
	tgz|tbz|txz)
		if tar -C "$@/.." -cf - "$(basename "$@")" | 7za a -si "$@.$format"
		then
			success
		else
			error "Compression failed"
		fi
	;;
	7z-pass|zip-pass)
		# extra test needed
		if test -e "$@.$(echo $format | cut -d- -f1)"
		then
			error "$@.$(echo $format | cut -d- -f1) exists"
		fi

		# get password
		pass=-p"$(Xdialog --stdout --password --title "Archive password" --inputbox "Enter archive password:" 8 30)"
		if test "$pass" != '-p'
		then
			if 7z a "$pass" "$@.$(echo $format | cut -d- -f1)" "$@"
			then
				success
			else
				error "Compression failed"
			fi
		else
			exit 1
		fi
	;;
	*)
		if 7z a "$@.$format" "$@"
		then
			success
		else
			error "Compression failed"
		fi
	;;
	esac
fi