Hi
I have a number of servers and sometimes I want to check a setting on
all of them. Like "what is the default search domain".
For convenience I have all the server names in the environment:
export srv_all="example.org example.com"
(could be in a file, but environment is always at hand)
Then I get the answer by running:
parallel ssh {} "grep search /etc/resolv.conf" ::: $srv_all
and the output:
search example.org
search example.xxx
In the case above I really missing the hostname for the line with
"example.xxx" as this is wrong.
To get the hostname (input line) prefixed on each line I have to
write a bit more:
parallel echo -n {}: \; ssh {} "grep search /etc/resolv.conf" :::
$srv_all
Then the output become:
example.org:search example.org
example.com:search example.xxx
and then I go to example.com and fix the problem.
One problem is that when get more lines than one, e.g. there is more
lines which matches my grep, like 'nameserver', then only the first
line got the prefix.
The command for that is:
parallel ssh {} grep nameserver /etc/resolv.conf \| sed -e s/^/{}:/
::: $srv_all
...but "\| sed -e s/^/{}:/" is not that nice to read.
Second is that it would be nice if "echo -n {}: \;" could be a
one-character-option.
/hans