Python linux-收听打开的终端标准输出

假设我有一个独立于python脚本的开放终端。是否可以以某种方式收听此终端标准输出？

如果需要捕获所需的确切过程，可以使用

strace

假设你有两个终端。 从第一个终端运行

ping

命令

ping google.com

PING google.com (xxx.xxx.xxx.xxx) 56(84) bytes of data.
64 bytes from muc11s14-in-f14.1e100.net (xxx.xxx.xxx.xxx): icmp_seq=1 ttl=116 time=11.5 ms
64 bytes from muc11s14-in-f14.1e100.net (xxx.xxx.xxx.xxx): icmp_seq=2 ttl=116 time=10.9 ms
64 bytes from muc11s14-in-f14.1e100.net (xxx.xxx.xxx.xxx): icmp_seq=3 ttl=116 time=11.3 ms
64 bytes from muc11s14-in-f14.1e100.net (xxx.xxx.xxx.xxx): icmp_seq=4 ttl=116 time=11.4 ms
...

现在切换到第二终端并运行：

strace-e trace=write-s1000-fp$（pgrep ping）

此时，我们得到了另一个终端的输出。让我们转到python部分

from subprocess import Popen, PIPE, STDOUT, check_output
import shlex

process_id = check_output(shlex.split("pgrep ping"), text=True).strip()

p = Popen(
    shlex.split("strace -e trace=write -s1000 -fp {0}".format(process_id)),
    stdin=PIPE, stdout=PIPE, stderr=STDOUT, text=True
)
for line in p.stdout:
    print(line.strip())

迭代

p.stdout

，您将获得另一个终端的进程输出

strace: Process 765549 attached
write(1, "64 bytes from ber01s08-in-f238.1e100.net (xxx.xxx.xxx.xxx): icmp_seq=732 ttl=116 time=11.4 ms\n", 93) = 93
write(1, "64 bytes from ber01s08-in-f238.1e100.net (xxx.xxx.xxx.xxx): icmp_seq=733 ttl=116 time=11.3 ms\n", 93) = 93
write(1, "64 bytes from ber01s08-in-f238.1e100.net (xxx.xxx.xxx.xxx): icmp_seq=734 ttl=116 time=11.4 ms\n", 93) = 93
write(1, "64 bytes from ber01s08-in-f238.1e100.net (xxx.xxx.xxx.xxx): icmp_seq=735 ttl=116 time=11.5 ms\n", 93) = 93
write(1, "64 bytes from ber01s08-in-f238.1e100.net (xxx.xxx.xxx.xxx): icmp_seq=736 ttl=116 time=11.3 ms\n", 93) = 93

---

如果通过

子流程

模块从Python脚本中启动此终端，则可以通过相关管道进行读写。查看更多信息。是的，我知道这一点，但是我想要听的终端独立于python脚本。那么，我认为你不能。如果这个过程是从别处开始的，你就不能钩住它的流，这就像劫持一样understand@omEchan如果您有权访问该终端，则可以让Python脚本持续读取该文件。

strace: Process 765549 attached
write(1, "64 bytes from ber01s08-in-f238.1e100.net (xxx.xxx.xxx.xxx): icmp_seq=732 ttl=116 time=11.4 ms\n", 93) = 93
write(1, "64 bytes from ber01s08-in-f238.1e100.net (xxx.xxx.xxx.xxx): icmp_seq=733 ttl=116 time=11.3 ms\n", 93) = 93
write(1, "64 bytes from ber01s08-in-f238.1e100.net (xxx.xxx.xxx.xxx): icmp_seq=734 ttl=116 time=11.4 ms\n", 93) = 93
write(1, "64 bytes from ber01s08-in-f238.1e100.net (xxx.xxx.xxx.xxx): icmp_seq=735 ttl=116 time=11.5 ms\n", 93) = 93
write(1, "64 bytes from ber01s08-in-f238.1e100.net (xxx.xxx.xxx.xxx): icmp_seq=736 ttl=116 time=11.3 ms\n", 93) = 93