find your script location within the script

When you want to execute a BASH script, you need to know the location where the script is located from within the script.

$0 or $BASH_SOURCE provides the name of the script, but it does not provide the absolute path.

dirname command comes to the rescue. This command deletes any prefix ending in / and the suffix (if present in string) from string, and prints the result on the standard output.

eg:
#dirname /tmp/20150306/abc.txt
/tmp/20150306

So the directory where script is located can be retrieved using dirname $0. But this will not give the absolute path if you run the script from a relative path.

This can be overcome by a combination of changing to the directory of the script and then printing the current working directory.

CURRDIRECTORY=$(cd `dirname $0` && pwd -P)

The change directory command within the script will not change directory and any other calls within the script and are still relative to the current working directory. This behaviour can be overcome by calling the script using the step like below.

. “${CURRDIRECTORY}/scriptname.sh”

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