Linux netcat 的新线路问题
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new line issue with netcat
提问by JohnG
I am using below command to send some strings to udp listening server.
我正在使用以下命令将一些字符串发送到 udp 侦听服务器。
echo "A 192.168.192.168" | nc -u 192.168.2.1 1234
echo "A 192.168.192.168" | nc -u 192.168.2.1 1234
but the server is getting trailing '\n' in echoed string.
但服务器在回显字符串中尾随 '\n'。
I have tried below command too, but failed
我也试过下面的命令,但失败了
echo "A 192.168.192.168" | nc -uC 192.168.2.1 1234
echo "A 192.168.192.168" | nc -uC 192.168.2.1 1234
How can I remove that trailing new line character ?? Do I have any special option in nc ??
如何删除尾随的换行符?我在 nc 有什么特别的选择吗??
回答by Levon
Try using
尝试使用
echo -n
so
所以
echo -n "A 192.168.192.168" | nc -u 192.168.2.1 1234
echo man pagesays: -n do not output the trailing newline
回声手册页说: -n do not output the trailing newline
回答by c00kiemon5ter
echo
usually provides -n
flag. This is not standard.
echo
通常提供-n
标志。这不是标准的。
stringA string to be written to standard output. If the first operand is -n, or if any of the operands contain a backslash ( '\' ) char‐ acter, the results are implementation-defined.
On XSI-conformant systems, if the first operand is -n, it shall be treated as a string, not an option.
string要写入标准输出的字符串。如果第一个操作数是 -n,或者任何一个操作数包含反斜杠 ('\') 字符,则结果是实现定义的。
在符合 XSI 的系统上,如果第一个操作数是 -n,则应将其视为字符串,而不是选项。
I would suggest using printf
我建议使用 printf
printf "A 192.168.192.168" | nc -u 192.168.2.1 1234
printf
doesnt append a new line unless it is told to, and it's standard behavior.
printf
除非被告知,否则不会追加新行,这是标准行为。