解决centos下sudo运行tshark，写入文件显示：Permission denied.

在-w时，需要把文件名写全，相对路径无权限，则需要写成绝对路径，比如

sudo tshark -w /home/xxxx/mypcap.pcap

下面的不行

sudo tshark -w mypcap.pcap # Permission denied

参考链接

tshark gives “permission denied” writing to (any) file in home dir.：https://www.linuxquestions.org/questions/linux-networking-3/tshark-gives-permission-denied-writing-to-any-file-in-home-dir-650952/