+ process. In this case, _\be_\bn_\bv_\b__\bc_\bh_\be_\bc_\bk and _\be_\bn_\bv_\b__\bd_\be_\bl_\be_\bt_\be behave
+ like a blacklist. Since it is not possible to blacklist
+ all potentially dangerous environment variables, use of
+ the default _\be_\bn_\bv_\b__\br_\be_\bs_\be_\bt behavior is encouraged.
+
+ In all cases, environment variables with a value beginning
+ with () are removed as they could be interpreted as b\bba\bas\bsh\bh
+ functions. The list of environment variables that s\bsu\bud\bdo\bo
+ allows or denies is contained in the output of sudo -V
+ when run as root.
+
+ Note that the dynamic linker on most operating systems
+ will remove variables that can control dynamic linking
+ from the environment of setuid executables, including
+ s\bsu\bud\bdo\bo. Depending on the operating system this may include
+ _RLD*, DYLD_*, LD_*, LDR_*, LIBPATH, SHLIB_PATH, and oth
+ ers. These type of variables are removed from the envi
+ ronment before s\bsu\bud\bdo\bo even begins execution and, as such, it
+ is not possible for s\bsu\bud\bdo\bo to preserve them.
+
+ To prevent command spoofing, s\bsu\bud\bdo\bo checks "." and "" (both
+ denoting current directory) last when searching for a com
+ mand in the user's PATH (if one or both are in the PATH).
+ Note, however, that the actual PATH environment variable
+ is _\bn_\bo_\bt modified and is passed unchanged to the program
+ that s\bsu\bud\bdo\bo executes.