Boucles imbriquées en shell : for

for i in $(seq -w 0 13) 
 do for j in $(seq -w 1 12) 
  do echo "20$i-$j" 
  done 
 done 
 

for i in $(seq -w 0 13) 
do for j in $(seq -w 1 12) 
do echo "20$i-$j" 
done 
done 

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