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| Am I cute, or am I cute? |
GNU Coretutils
My recommendation is: just use coretutils and forget about all the complication. You can install Homebrew, and readlink is conveniently available as greadlink, so any scripts that depend on the original readlink in OSX are not affected.coreutils using
Bash Function
If you cannot install or use GNU coreutils, you will have to resort to writing a bash function.
#!/bin/bash
realpath() {
[[ $1 = /* ]] && echo "$1" || echo "$PWD/${1#./}"
}
realpath "$0"
This is a better solution, but be aware of the limitation that it does not detect recursive links and handle errors.
#!/bin/sh
TARGET_FILE=$1
cd `dirname $TARGET_FILE`
TARGET_FILE=`basename $TARGET_FILE`
# Iterate down a (possible) chain of symlinks
while [ -L "$TARGET_FILE" ]
do
TARGET_FILE=`readlink $TARGET_FILE`
cd `dirname $TARGET_FILE`
TARGET_FILE=`basename $TARGET_FILE`
done
# Compute the canonicalized name by finding the physical path
# for the directory we're in and appending the target file.
PHYS_DIR=`pwd -P`
RESULT=$PHYS_DIR/$TARGET_FILE
echo $RESULT
This is a simpler alternative, but does not work if symlink is something like /usr/bin/
function readlink() {
DIR=$(echo "${1%/*}")
(cd "$DIR" && echo "$(pwd -P)")
}
Use Python
You can use python's abspath
#!/usr/bin/env python
import os.path
import sys
for arg in sys.argv[1:]:
print os.path.abspath(arg)
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