Linux input and ouput command < symbol & > symbol All In One

left input / right output

< 向左侧输入

# 把文件内容复制到剪贴板中 ✅
$ pbcopy < filename.txt

> 向右侧输出

# 把剪贴板内容粘贴到文件中 ✅
$ pbpaste > filename.txt

demos

$ echo "hello world" > filename.txt

# 复制到剪切板
$ pbcopy < filename.txt

# 粘贴到文件
$ pbpaste > filename.txt

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From： https://www.cnblogs.com/xgqfrms/p/17318607.html