mac コマンドで連番のファイルを作成する

$ touch foo_{1..10}.txt

<出力結果>
foo_1.txt  foo_10.txt  foo_2.txt  foo_3.txt  foo_4.txt  foo_5.txt  foo_6.txt  foo_7.txt  foo_8.txt  foo_9.txt

$ rm foo_{1..10}.txt

touch {a..z}.txt

<出力結果>
a.txt  b.txt  c.txt  d.txt  e.txt  f.txt  g.txt  h.txt  i.txt  j.txt  k.txt  l.txt  m.txt  n.txt  o.txt  p.txt  q.txt  r.txt  s.txt  t.txt  u.txt  v.txt  w.txt  x.txt  y.txt  z.txt

for i in {1..10} ; do echo $i >> foo_$i.txt ; done