I can't seem to get this to work. I am trying this:
sed -e 's/#PermitRootLogin yes/PermitRootLogin no/' /etc/ssh/sshd_config
I am not super familiar with sed. Any help?
Hi.
This won't update the file, if your sed supports it, use sed -i
Otherwise you can use ed.
ed /etc/ssh/sshd_config << !
,s/#PermitRootLogin yes/PermitRootLogin no/
w
q
!
(someone will also, probably give you a nice Perl one-liner...)
Is commenting out PermitRootLogin yes not the same as an uncommented PermitRootLogin no anyway?
No, it is not the same because that is the default in SSHD_config
Also, I know that command won't update the file, but it doesn't even replace it in the output. I would end up using -i to actually replace it, but I am looking at the output.
I need it to uncomment and then replace the yes with a no.
Then perhaps the expression you are using does not match the content in the file.
It does matchup, I just dont' think the sed command is working right.
Here part of the file:
#LoginGraceTime 2m
#PermitRootLogin yes
#StrictModes yes
#MaxAuthTries 6
Your ed command did work, but I'd liek to get it working with sed so I can add it to a bash script if possible.
I know that in sed you can have comments using #. My sed supports this too, but it doesn't cause any problem with the substitution.
Does it make any difference if you escape the # (i.e. like \#)?
Otherwise, perhaps your input file has a hidden or control character somewhere?
Sorry for the delayed response. I will try the escape. In theory my command up in the first post should work right?
I am running RHEL 5.3 so it should have a recent version of sed. I will try the results tomorrow!
Hi Mark.
There is nothing wrong with your original code. There's nothing fancy about it!
Good luck!
All, I just ran this using a \# and it worked, but without the escape it didn't work.
I also ran it without the \ escape and it worked. no idea what I was seeing before that could have caused the issue.
sed -e 's/#PermitRootLogin yes/PermitRootLogin no/' /etc/ssh/sshd_config