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#tail -f filename.txt 打印文件内容,当文件内容增长时,输出增长的内容。

#man tail -f, --follow[={name|descriptor}] output appended data as the file grows; an absent option argument means 'descriptor' -F same as --follow=name --retry

#应用场景 打印nginx的log,当log增长时自动输出增长的内容: tail -f /var/log/nginx/error.log