Many use systems like GitHub and BitBucket, but some companies have their own repository structure in directory mode.
So imagine that a devops backs up a directory called repos where it has all the versioned projects and the dev has this copy but needs to update it.
cd repos
for i in */.git; do ( echo $i; cd $i/..; git fetch origin; ); done;
You can change your command there with your need, if it were mercurial easily adapted to
for i in */.hg; do ( echo $i; cd $i/..; hg update; ); done
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