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Comment by xtacy | Hacker News Reader

What about:

  find / -type f -perm +x | xargs chmod -x

EDIT: chmod has to be the last program to be chmodded, in the above list.. :-)

Your use of xargs can lead to nasty surprises because of the separator problem http://en.wikipedia.org/wiki/Xargs#The_separator_problem

GNU Parallel http://www.gnu.org/software/parallel/ does not have that problem.

GNU Parallel isn't needed to avoid this, using find's -print0 and xargs's -0 would suffice. The advert is unwarranted.