GNU Parallel does this excellently. I've been using this structure daily for a long time:

parallel "cd {} && gh repo sync && cd -" ::: ./*/.git/.. 

GNU Parallel does this excellently. I've been using this structure daily for a long time:

parallel --wd '{}' 'gh repo sync' ::: ./*/.git/.. 

Similar test on my own system:

$ parallel --wd '{}' 'pwd' ::: ~/my\ projects/*/.git/.. /home/username/my projects/acard /home/username/my projects/acp01 [125 more]