export SOL_LOG_LEVEL="LEVEL"

    defines the maximum level to show messages. This affects all
    domains. The value of LEVEL can be an integer or the string
    alias such as CRITICAL, ERROR, WARNING, INFO, DEBUG, CRI, ERR,
    WRN, INF, DBG.

export SOL_LOG_LEVELS="domain1:level1,domain2:level2,...,domainN:levelN"

    the fine-grained version of $SOL_LOG_LEVEL that specifies
    different levels per domain. The specification is a key:value
    pair, the key being the domain name and the level being an
    integer or string alias.

export SOL_LOG_ABORT="LEVEL"

    if a message_level is less or equal to LEVEL, then the program
    will abort execution with abort(3). Say SOL_LOG_ABORT=ERROR,
    then it will abort on critical or error messages.
    Defaults to critical only.

export SOL_LOG_SHOW_COLORS=[0|1]

    will disable or enable the color output.
    Defaults to enabled if terminal supports it.


export SOL_LOG_SHOW_FILE=[0|1]

    will disable or enable the file name in output.
    Enabled by default.

export SOL_LOG_SHOW_FUNCTION=[0|1]

    will disable or enable the function name in output.
    Enabled by default.

export SOL_LOG_SHOW_LINE=[0|1]

    will disable or enable the line number in output.
    Enabled by default.