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lang-bash
oldstate=$(set +o)is a simpler (and POSIX) way to store all options.pdksh/mksh(and other pdksh derivatives) orzshwhereset +oonly outputs the deviations from the default settings. That would work for bash/dash/yash but not be portable.evalwhich can be a security risk) --> if you have the new shell featurelocal -thenlocal -is one line of code and does all the saving and restoring for you... without caveats or eval.