built-in (AFAIK) pushd and popd commands
You can determine if a command is builtin in bash with the type command. E.g.,
type
$ type pushd pushd is a shell builtin $ type mv mv is aliased to `mv -i' $ type ssh ssh is hashed (/usr/bin/ssh) $ type rsync rsync is /usr/bin/rsync
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You can determine if a command is builtin in bash with the
type
command. E.g.,