Always get the full path of a relative file in bash
I have a bash script located in /home/http/mywebsite/bin/download.sh
I have a config file in /home/http/mywebsite/config/config.yaml
Now I want to read the yaml file no matter where I execute my script.
The problem: When I cd into /home/http/mywebsite/bin/ and run ./download.sh everything works.
When I cd into /home/ and run http/mywebsite/bin/download.sh it can not find the config file because of the relative path.
How do I make sure I can always read the config file no matter where I execute the script. It is always located 4 directories up from the script in config/config.yaml
The script looks like this:
#!/bin/bash
# This will give me the root directory of my project which is /home/http/mywebsite/
fullpath="$( cd ../"$( dirname "${BASH_SOURCE[0]}" )" && pwd )"
cat ${fullpath}config/config.yaml
This works if I execute it inside the directory where the script is.
If I execute the script from another directory such as /home/ I get the following error:
cd: ../http/mywebsite/bin: No such file or directory
cat: config/config.yaml: No such file or directory
Solution?
If it is possible it would be great with a code snippet that can traverse up a path N amount of times, this would solve my problem. But it is too advanced for me.
For example you can set a variable "cd_up=1" how many times to go up. The run the loop/sed or whatever magic.
And it would turn the absolute string from: /home/http/mywebsite/bin/ into: /home/http/mywebsite/
And changing it to 2 it would change the string to: /home/http/
Managed to solve it finally by using:
#!/bin/bash
cd "$(dirname "$0")"
BASE_DIR=$PWD
# Root directory to the project
ROOT_DIR=${BASE_DIR}/../
cat ${ROOT_DIR}config/config.yaml
This allows me to execute the script no matter where I am.
You can use which command to determine absolute path of the executing script no matter where you are running
BASE_DIR=$(which $0 | xargs dirname)
ROOT_DIR=${BASE_DIR}/../..
cat ${ROOT_DIR}/config/config.yaml
Lets try printing the path from different locations.
-bash-4.1$ /tmp/dir.sh
$0 - /tmp/dir.sh. Absolute path - /tmp
-bash-4.1$ cd /tmp
-bash-4.1$ ./dir.sh
$0 - ./dir.sh. Absolute path - /tmp
-bash-4.1$
-bash-4.1$ cd /usr/bin
-bash-4.1$ ../../tmp/dir.sh
$0 - ../../tmp/dir.sh. Absolute path - /tmp
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