![]() ![]() Some P2P and instant messaging clients do so as well. ![]() FTP clients often do this when requesting an active mode transfer. Other applications open ephemeral ports temporarily for a file transfer or other event. Note that only call is issued to external commands, to get a list of taken ports at the beginning. SunRPC ports are often found in the ephemeral range. Printf '%d\n' code makes purely portable use of netstat, egrep, awk,
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