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首先向`/tmp/a.txt`文件中写入`hello, world`：
`echo "hello, world" > /tmp/a.txt`{{execute T2}}
通过`cat`命令可以打印文件内容，和linux里的cat命令类似。
`cat /tmp/a.txt`{{execute T2}}
你可以看到`hello, world`被打印了出来。