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Hi everyone and thank you in advance! I used to run the following script with ncat Version 5.51 and it gave me wonderful formatting

[root@server user]# for i in "cat server_list" ; do echo $i | tr '\n' '\t' ; nc -zv $i 22 ; done

host1 Connection to host1 22 port [tcp/ssh] succeeded!
host2 Connection to host2 22 port [tcp/ssh] succeeded!
host3 Connection to host3 22 port [tcp/ssh] succeeded!

But since we needed to decomm all RHEL6 servers, I'm now getting this unwanted output when running the exact same script in RHEL7 using ncat Version 7.50

[root@server2 user]# for i in "cat server_list" ; do echo $i | tr '\n' '\t' ; nc -zv $i 22 ; done

host1 Ncat: Version 7.50 ( https://nmap.org/ncat )
Ncat: Connected to IP.
Ncat: 0 bytes sent, 0 bytes received in 0.01 seconds.
host2 Ncat: Version 7.50 ( https://nmap.org/ncat )
Ncat: Connected to IP.
Ncat: 0 bytes sent, 0 bytes received in 0.01 seconds.
host3 Ncat: Version 7.50 ( https://nmap.org/ncat )
Ncat: Connected to IP.
Ncat: 0 bytes sent, 0 bytes received in 0.01 seconds.

Is there a way to get the same formatting as how I used to get since it greatly improves readability for me? Tried redirecting left and right but no dice.
Thank you so much and any advice is appreciated!

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  • I think your two ncs are different programs. See this answer. Commented Dec 3, 2024 at 20:37
  • Thanks for your answer Kamil! The rpm's looked similar but with different versions so did not think this was the issue Commented Dec 5, 2024 at 15:09

1 Answer 1

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nc --verbose outputs logs to stderr, so you can capture those 2>&1, then grep to filter out the version text:

... ; nc -zv $i 22 2>&1 | grep -v Version ; ...
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