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# Environment variables
OAI uses/supports a number of environment variables, documented in the following:
- `NFAPI_TRACE_LEVEL`: set the nfapi custom logging framework's log level; can be one of `error`, `warn`, `note`, `info`, `debug`
- `NR_AWGN_RESULTS_DIR`: directory containing BLER curves for L2simulator channel modelling in SISO case
- `NR_MIMO2x2_AWGN_RESULTS_DIR`: directory containing BLER curves for L2simulator channel modelling in 2x2 MIMO case
- `NVRAM_DIR`: directory to read/write NVRAM data in (5G) `nvram` tool; if not defined, will use `PWD` (working directory)
- `OAI_CONFIGMODULE`: can be used to pass the configuration file instead of `-O`
- `OAI_GDBSTACKS`: if defined when hitting an assertion (`DevAssert()`, `AssertFatal()`, ...), OAI will load `gdb` and provide a backtrace for every thread
- `OAI_RNGSEED`: overwrites any seed for random number generators (RNG) in simulators
- `OAI_THREADPOOLMEASUREMENTS`: path to a file to store thread pool debugging information, see the [thread pool documentation](..common/utils/threadPool/thread-pool.md)
- `OPENAIR_DIR`: should point to the root directory of OpenAirInterface; some code relies on this to get a filename, e.g., BLER curves for L2sim channel emulation
- `USIM_DIR`: directory to read/write USIM data in (4G) `usim` tool; if not defined, will use `PWD` (working directory)
Furthermore, these variables appear in code that is not maintained and maybe not even compiled anywhere:
- `HOST`: alternative host to connect to, for CLI, if neither `REMADDR` nor `SSH_CLIENT` are defined
- `REMADDR`: host to connect to, for CLI client
- `SSH_CLIENT`: alternative host to connect to, for CLI, if `REMADDR` is not defined
- `USER`: user name in the command-line interface
- `rftestInputFile`: input file for the `calibration_test` tool