Bash: How to create permanent substitute strings in Bash commands?

Question

I have to often do one of: ssh really-really-long-hostnameN where N is one of {10001-10099}

I would really like to be able to do: ssh myhostN

I have .bashrc entry: export myhost="really-really-long-hostname"

But then I have to do: ssh ${myhost}N

which is a huge improvement, but not quite what I wanted. Is there a way to do a substitution where I can do: ssh myhostN ?

score 1 · Accepted Answer · edited Apr 13 '17 at 12:36

1

For this I would write a function:

s() {
    ssh "really-really-long-hostname$1"
}

Then call it like so:

s 10037

Further reading:

edited Apr 13 '17 at 12:36

Community

answered Oct 16 '16 at 08:10

Wildcard

score 1 · Answer 2 · answered Oct 16 '16 at 08:50

1

Edit a file ~/.ssh/config and add entries like this for each host:

Host myhostN
    HostName    really-really-long-hostname100N

Set permissions to this file to 0600:

chmod 0600 ~/.ssh/config

Then you'll be able to use myhostN with ssh related commands (sftp, scp, etc.) instead of really-really-long-hostname100N.

answered Oct 16 '16 at 08:50

Satō Katsura

Do I have to do this for each host, or can I do something with N to make it a one liner? – DDauS Oct 16 '16 at 10:29
@DDauS You have to do that for each host. You can automate the creation of the entries with a script. – Satō Katsura Oct 16 '16 at 14:37

score 0 · Answer 3 · edited Jun 11 '20 at 14:16

0

I solved it like this: Edit your local /etc/hosts file. Add IP and name like this

216.58.211.14    my.google0
216.58.211.3     mygoogle1

..in the shell

ping mygoogle1
ssh my.google0

will work on local machine

Another way is using aliases.

Add to `~/.bashrc`

alias ssh1='ssh -2 somehost.foo -l bar'

next time, when bash is executed you connect by typing ssh1.

edited Jun 11 '20 at 14:16

Community

answered Oct 16 '16 at 09:42

Michael D.