Given a perlbrew + cpanm setup (which now I can not possibly imagine my toolbox without), a quick dirty/useful way to switch perls and restore all modules in minutes - without an elaborate/proper @INC scan - is to use perllocal:

1. Gather:

perldoc -t perllocal | perl -lane'/"Module"/ && print $F[-1]' | sort -
+u >/tmp/pms

[download]

2. Switch:

perlbrew switch perl-5.42.0

[download]
+ 
cpanm -v </tmp/pms &>>/tmp/inst.log & tail -f /tmp/inst.log

[download]
Update: moritz++ for the list argument reminder and kcott++ for the logfile suggestion. Prev. was 
cat /tmp/pms | while read module ; do cpanm -v $module ; done

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(yes, I prefer the useless cat :) - I like the award!)

-- 
perl -MLWP::Simple -e'print$_[rand(split(q.%%\n.,
get(q=http://cpan.org/misc/japh=)))]'

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In reply to perlbrew: moving to a new perl with all current modules by zgrim

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