Shell scripts under tools folder using relative paths

The way shell scripts under tools/ folder are using relative paths results in absolutely undesired behavior, when they are executed by other scripts.

In following working example current directory will be "/path/to/in-portal/tools", which is correct.

cd /path/to/in-portal/tools
./fix_perms.sh

In following working example current directory will be "/path/to/in-portal", which is not correct.

cd /path/to/in-portal
./tools/fix_perms.sh

After digging a bit on the Internet I've found a solution, that finds absolute path to folder, where executed script is actually located:

SCRIPT_FOLDER=`cd $(dirname $0); pwd`

Also these scripts missing #!/bin/sh at the top of the script.

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