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Re: equivalent of Linux readlink -f in pure bash?

From: Steven W. Orr
Subject: Re: equivalent of Linux readlink -f in pure bash?
Date: Tue, 09 Aug 2011 09:50:49 -0400
User-agent: Mozilla/5.0 (Windows; U; Windows NT 6.1; en-US; rv: Gecko/20110616 Thunderbird/3.1.11

On 8/9/2011 5:29 AM, Bernd Eggink wrote:
On 09.08.2011 03:44, Jon Seymour wrote:
Has anyone ever come across an equivalent to Linux's readlink -f that
is implemented purely in bash?

You can find my version here:


As it contains some corrections from Greg Wooledge, it should handle even
pathological situations. ;)


I'd just like to make a couple of suggestions for your script (I hope these are welcome):

*) You reset OPTIND to 1 but you didn't declare it local. This will cause any caller of getlink which uses getopts to reset its variable to 1. (I mention this because it cost me a couple of hours a while back.)

When calling getopts, especially from a function that is intended to not be used at a top level for processing command line options, you should declare local copies of OPTIND, OPTARG and OPTERR.

*) To remove the trailing slashes, instead of

            while [[ $file == */ ]]

            file=${file##*/}    # file name

just say

*) Instead of

          [[ ! -d $dir ]] &&

how about this for slightly cleaner?

          [[ -d $dir ]] ||

Time flies like the wind. Fruit flies like a banana. Stranger things have  .0.
happened but none stranger than this. Does your driver's license say Organ ..0
Donor?Black holes are where God divided by zero. Listen to me! We are all- 000
individuals! What if this weren't a hypothetical question?
steveo at syslang.net

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