[SOLVED] bash script - return full path and filename

arifsaha · 03-31-2011, 11:16 AM

How about this one to get absolute path? Simpler, even local variables are not needed. Little modification will get you the file base name if needed, as soon as you can define its behaviour when you give directory as argument (should it be the last directory or empty string?).

Code:

function abspath {
	if [[ -d "$1" ]]
	then
		pushd "$1" >/dev/null
		pwd
		popd >/dev/null
	elif [[ -e $1 ]]
	then
		pushd $(dirname $1) >/dev/null
		echo $(pwd)/$(basename $1)
		popd >/dev/null
	else
		echo $1 does not exist! >&2
		return 127
	fi
}

konsolebox · 04-09-2011, 04:19 AM

you can try mine as well:

Code:

function getabspath {
	local -a T1 T2
	local -i I=0
	local IFS=/ A

	case "$1" in
	/*)
		read -r -a T1 <<< "$1"
		;;
	*)
		read -r -a T1 <<< "/$PWD/$1"
		;;
	esac

	T2=()

	for A in "${T1[@]}"; do
		case "$A" in
		..)
			[[ I -ne 0 ]] && unset T2\[--I\]
			continue
			;;
		.|'')
			continue
			;;
		esac

		T2[I++]=$A
	done

	case "$1" in
	*/)
		[[ I -ne 0 ]] && __="/${T2[*]}/" || __=/
		;;
	*)
		[[ I -ne 0 ]] && __="/${T2[*]}" || __=/.
		;;
	esac
}

Code:

getabspath "/path/.././././to/somewhere/"
echo "$__"

getabspath ".././././....//path/.././././to/somewhere/with/somefile.ext"
echo "$__"

note that the path or files does not need to exist.

the function can also be modified to accept another argument which could represent the name of the variable which will hold the result. i.e. like

Code:

getabspath <path> <variable_name>

Andy Alkaline · 07-07-2011, 05:20 PM

Calling a binary from a bash script can sometimes be preferred. Here's some C code which can be compiled using gcc -Wall -o getpath getpath.c

Code:

//      getpath.c

#include <stdio.h>
#include <stdlib.h>
#include <string.h>

int main(int argc, char **argv)
{	
	if (argc != 2)
		{
			printf("Getpath takes one filename or directory as a parameter\n");
			exit (1);
		}
	
	char AbsPath[strlen(argv[1] + 1)];
	realpath(argv[1],AbsPath);
	printf("%s\n",AbsPath);
	return 0;
}

So if desired, copy the code above to a plain text file called getpath.c and compile it. Then use "./getpath <filename>" If you put getpath is in your path somewhere, the ./ can be omitted.