Some light Googling[1][2] shows that Solaris's /dev/tcp is some sort of pseudo-device for configuring the system's network settings. For both the Bash and Korn

Some light Googling[1][2] shows that Solaris's /dev/tcp is some sort of pseudo-device for configuring the system's network settings. For both the Bash and Korn shells, the syntax looks like this: $ cat < /dev/tcp/localhost/1234 with traffic being uni-directional. More complex (bi-directional) examples documented at <https://tldp.org/LDP/abs/html/devref1.html#DEVTCP https://tldp.org/LDP/abs/html/devref1.html#DEVTCP>. Tested on macOS: # in one terminal bash$ nc -l 1234 # in second terminal bash$ cat </dev/tcp/localhost/1234 # lines typed into the 'nc' terminal will be printed to # the other. [1] https://docs.oracle.com/cd/E19857-01/817-1836-10/perfplat.html https://docs.oracle.com/cd/E19857-01/817-1836-10/perfplat.ht... [2] https://www.ibm.com/docs/en/was-nd/8.5.5?topic=systems-tuning-solaris https://www.ibm.com/docs/en/was-nd/8.5.5?topic=systems-tunin...