Core¶

This part of the bash lib contains some general helper methods which are not suitable to be put in other lib parts.

path¶

Get the absolute path to the called script. It's the same as $source_dir which is used in the general examples but this stays the same while the variable may be changed in scripts.

# load the help file shich will output help pages directly beside the script
source "$(path)/$(basename $0).help"

It is always the directory path of the first called script which included the libraries.

usesudo¶

This will return a short string containing 'sudo' or an empty string '' if no sudo is needed or possible. This will return the sudo command only if not user root and sudo is generally allowed for the active user.

This can be stored in a variable $usesudo and used to make command calls:

usesudo=$(usesudo)
$usesudo systemctl start my_service

needsudo¶

This method will check the sudo rights and exit with an alert message if there is a problem. This can be:

• if the active user is not root and sudo is not allowed
• if commands are given aren't allowed to be called using sudo for the active user

To check only the general sudo need and allowance:

needsudo

And to check some specific commands use:

needsudo "systemctl start tomcat8"