Convert Relative path to Absolute path, without changing directory to the file location.

Thread Tools Search this Thread
Top Forums UNIX for Beginners Questions & Answers Convert Relative path to Absolute path, without changing directory to the file location.
# 1  
Old 12-03-2019
Convert Relative path to Absolute path, without changing directory to the file location.


I am creating a file with all the source folders included in my git branch, when i grep for the used source, i found source included as relative path instead of absolute path, how can convert relative path to absolute path without changing directory to that folder and using readlink -f ?

grep -r "src +=" --include=*.spec $REPOROOT

src += ../src
src += ../stubs
src += ../../dataLU/src
src += ../../src   
src += ../src
src += ../export/src
src += ../src
src += ../src       
src += ../../src    
src += ../src

grep -r "src +=" --include=*.spec $REPOROOT | cut -d "=" -f2


i tried using the below two ways
echo "$(cd "$(dirname "../../dataLu/src")"; pwd)/$(basename "../../dataLu/src")"
readlink -f ../../dataLu/src

while this worked, i have to change directory to the location of the spec file there are more than 1000 spec files, hence i want to get the path from the top of the repo without changing directory

desired results are

Thank you!

OS: linux SUSE (I don't have realpath)
Shell : bash
# 2  
Old 12-03-2019
You need to include a variable which contains the full path of your source directory.

Is what you are asking?
# 3  
Old 12-04-2019
In bash on some systems it is a shell function:
realpath ()                                                                                                                                                                                   
    if [ -d "$f" ]; then                                                                                                                                                                      
        base="/$(basename "$f")";                                                                                                                                                             
        dir=$(dirname "$f");                                                                                                                                                                  
    dir=$(cd "$dir" && /bin/pwd);                                                                                                                                                             
    echo "$dir$base"                                                                                                                                                                          

I cannot vouch for this code because I use the standard C library realpath in a compiled module. The example above is a copy that I found a while back when researching a similar problem to what you have when trying to migrate scripts across Linux distros.

If someone knows more I'd like to see it.
This User Gave Thanks to jim mcnamara For This Post:
# 4  
Old 12-04-2019
I don't think either of a/src, b/src, or x/y/dataLu/src is an absolute path; they all start downwards from your current working directory, $PWD.

Just in case neither the readlink nor the realpath solution please you, and you don't want external commands but bash builtins do the job for you, how would something along this line fit in:
ls "${TMP:-${PWD%/*/*}${DIR#../..}}"

Unfortunately, shell's "parameter expansion" only works on one variable at a time, so the repeated assignments to temporary variables are inevitable. Still it will be faster than creating a process plus loading and running any extermal command.

Last edited by RudiC; 12-04-2019 at 06:04 AM..
This User Gave Thanks to RudiC For This Post:
# 5  
Old 12-06-2019

Spec=$( find . -name "*.spec" | sed 's/build.spec//g' )
for each in ${Spec[@]}; do

  hits=$( grep -rs "src +=" ${each}/build.spec | tr -d "(){}")
  for hit in ${hits[@]}; do   
    mhits="$mhits $( echo "${hit}" | cut -d "=" -f2 )"
  for print in ${mhits[@]}; do
    if [[ "$print" == ..* ]]; then
      pushd $each > /dev/null
      fqn=$(readlink -f $print )
      opx=$( echo "${fqn}" | sed "s|${REPOROOT}|\$REPOROOT|g" )
      echo "$opx"
      popd > /dev/null
    if [[ "${print}" == *"REPOROOT"* ]]; then
      echo "$print"

I wrote this one, and it worked
Login or Register to Ask a Question

Previous Thread | Next Thread

10 More Discussions You Might Find Interesting

1. UNIX for Dummies Questions & Answers

How to convert relative path to absolute path?

Hello Everyone, I want to convert Relative Path - /home/stevin/data/APP_SERVICE/../datafile.txt to Absolute Path - /home/stevin/data/datafile.txt Is there a built-in tool in Unix to do this or any good ideas as to how can I implement this. -Steve (5 Replies)
Discussion started by: qwarentine
5 Replies

2. Shell Programming and Scripting

How to change Absolute path to Relative path

Hello, I have a doubt:- --------------------- Current script:- ################################################################################################ prefix=user@my-server: find . -depth -type d -name .git -printf '%h\0' | while read -d "" path ; do ( cd "$path" || exit $?... (4 Replies)
Discussion started by: sahil_jammu
4 Replies

3. UNIX for Dummies Questions & Answers

deleting all the files inside a directory from a relative path

I have a file inside abc/def/ghi directory. let say a.txt I need to delete this a.txt from abc itself. I have tried ls /abc/def/ghi | xargs rm -r its saying rm: a.txt non-existent also tried rm -rf /def/ghi but in vein. plz help :) (2 Replies)
Discussion started by: gotam
2 Replies

4. Solaris

Changing of syslog file path instead of /var/log directory

Hi Please let me know how can we change the syslog file path from /var/log to /a directory in solaris Regards (4 Replies)
Discussion started by: amity
4 Replies

5. Shell Programming and Scripting

Retrieve directory path from full file path through sh

Hi, I have a file abcd.txt which has contents in the form of full path file names i.e. $home> vi abcd.txt /a/b/c/r1.txt /q/w/e/r2.txt /z/x/c/r3.txt Now I want to retrieve only the directory path name for each row i.e /a/b/c/ /q/w/e/ How to get the same through shell script?... (7 Replies)
Discussion started by: royzlife
7 Replies

6. Shell Programming and Scripting

absolute path for a script ran with relative path

I have a script in which i want to print absolute path of the same script irrespective of path from where i run script. I am using echo "pwd : `pwd`" echo "script name: $0" echo "dirname: `dirname $0`" when i run script from /my/test/dir/struct as ../ the output i... (10 Replies)
Discussion started by: rss67
10 Replies

7. UNIX for Dummies Questions & Answers

Help with absolute path and relative path

I'm having problems accessing the Knoppix software on my current computer and the replacement CD I ordered hasn't arrived yet. I have a guess at what the answer would be for this question but I am not sure as I cannot test it with the software. I have to create a directory called class, and... (1 Reply)
Discussion started by: mzero
1 Replies

8. Shell Programming and Scripting

getting full path from relative path

given a relative path, how do i convert it into a full one. i.e. if i am in /home/polypus and i am given foo/bar then to get a full path i can just concatinate it with pwd, but what if i am given "../mama" how do i programmatically convert: /home/polypus and ../mama into ... (4 Replies)
Discussion started by: polypus
4 Replies

9. UNIX for Dummies Questions & Answers

vi - replacing a relative path with absolute path in a file

Hi, I have a file with about 60 lines of path: app-defaults/boxXYZ....... I want to change this to /my/path/goes/here/app-defaults/boxXYZ, but of course vi doesn't like the regualr :s/old/new/ command. Is there any other quick way to do this? Thanks ;) (2 Replies)
Discussion started by: Yinzer955i
2 Replies

10. Shell Programming and Scripting

want the current directory without the absolute path

Hi guys I'm trying to move an empty directory to the $TRASH directory. Say the directory i have is ./hello/hello1/hello2 and i'm in hello2, and i want hello2 moved. this code: TRASH=$home/deleted find "$TRASH/$1" -type d -exec rmdir { } \; 2>/dev/null mv -f $1 $TRASH 2>/dev/null works... (2 Replies)
Discussion started by: olimiles
2 Replies
Login or Register to Ask a Question

Featured Tech Videos