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PS C:\Users\yama> ssh 1234567890@ssh02.ecc.u-tokyo.ac.jp
Last login: Fri May 14 08:15:52 2021 from 111.101.139.33
Last login: Fri May 14 08:15:52 2021 from 111.101.139.33
ssh02:~ 1234567890$ cd Desktop
ssh02:Desktop 1234567890$ mkdir practice
ssh02:Desktop 1234567890$ cd practice
ssh02:practice 1234567890$ ls -l
ssh02:practice 1234567890$
ssh02:practice 1234567890$ ls -l
total 1705
-rw-r--r--  1 1234567890  student  872744 May 14 08:56 image01.jpg
ssh02:practice 1234567890$ convert image01.jpg image01.png
ssh02:practice 1234567890$ ls -l
total 4524
-rw-r--r--  1 1234567890  student   872744 May 14 08:56 image01.jpg
-rw-r--r--  1 1234567890  student  1443287 May 14 08:56 image01.png
ssh02:practice 1234567890$