(ddd.info)Environment

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6.1.2 Your Program's Environment
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Your program normally inherits its environment from the inferior
debugger, which again inherits it from DDD, which again inherits it
from its parent process (typically the shell or desktop).

   In GDB, you can use the commands `set environment' and `unset
environment' to change parts of the environment that affect your
program.  Note: Your program's environment,
 for details.

   The following environment variables are set by DDD:

`DDD'
     Set to a string indicating the DDD version.  By testing whether
     `DDD' is set, a debuggee (or inferior debugger) can determine
     whether it was invoked by DDD.

`TERM'
     Set to `dumb', the DDD terminal type.  This is set for the
     inferior debugger only.(1)

`TERMCAP'
     Set to `' (none), the DDD terminal capabilities.

`PAGER'
     Set to `cat', the preferred DDD pager.

   The inferior debugger, in turn, might also set or unset some
environment variables.

   ---------- Footnotes ----------

   (1) If the debuggee runs in a separate execution window, the
debuggee's `TERM' value is set according to the `termType' resource;
Note: Customizing the Execution Window, for details.