DIR_PUT is a SAP Parameter attribute which is used to control Root directory for the upgrade information. This is available within R/3 SAP systems depending on the version and release level.
Below is the standard documentation available and a few details of the attributes values .
Directory where the temporarily-required data can be stored during an
R/3 upgrades. The logs written during the upgrade are also stored there.
Changing this parameter can only be done synchronously with a change in
the profile of the upgrade control program "R3up". As of 4.7, R3up is
able to set the parameter automatically.
See SAP Parameter Documentation for full SAP documentation for this profile parameter.