Hi,
I've a question on awk. In English I want to:
(a) open a file, (b) search through the file for records where length of field15 > 20 characters and (c) print out some fields in the record.
I've written the following and it works OK. The trouble is this will ALWAYS write out the column... (5 Replies)
In my ksh script, if the conditions of a if statement are true, then do nothing; otherwise, execute some commands.
How do I write the "do nothing" statement in the following example?
Example:
if (( "$x"="1" && "$y"="a" && "$z"="happy" ))
then
do nothing
else
command
command
fi... (3 Replies)
I am writing a Bash script that will either clone a database or setup a standby database. So Parameter 2 will be the operation type. If the value is not clone or standby I want to throw an error message. I suppose I can also do a case block. So far i have been unable to get the syntax working... (1 Reply)
Hi
I have the following case statement:
case $larg in
*_* )
a=${larg%_*}; b=${larg#*_};
;;
*^* )
a=${larg%^*}; b=${larg#*^};
;;
esac
I cannot figure out what *_* and *^* stand for...
Also what a=${larg%_*}; b=${larg#*_}; and
a=${larg%^*}; b=${larg#*^}; ... (1 Reply)
Hi there
I am trying to write an if statement in perl that will return "SUCCESS" if either of these conditions are true
a) if $changes is greater than 5 AND the $force flag is set to 1
OR
b) if $changes is greater than 0 AND $changes is less than 6
#!/usr/bin/perl -w
my $force =... (5 Replies)
Hi,
I'm trying to write an if statement that will check the USER parm against some text but I'm not quite sure how to use the or switch in the statement.. Can anyone help me out?...
If someone could also let me know when to use ( or if (( $USER != "user1" || "user2" || "user3" || "user4" ))... (6 Replies)
Hi everybody,
I'm sorry If I ask a silly question. I have a simple code like this
I have the following error:
Can anyone explain for me why I have this error, and how can I correct it?
Thanks in advance. (12 Replies)
Good Morning,
I typically run a batch of commands, from the command line, to process server operating statistics. That would look like this:
(these are days of the month)
In this instance I am processing a directory of file for July 6th 7th etc.
Those files would have names... (9 Replies)
Hi folks,
I have a scenario to convert the update statements into insert statements using shell script (awk, sed...) or in database using regex.
I have a bunch of update statements with all columns in a file which I need to convert into insert statements.
UPDATE TABLE_A SET COL1=1 WHERE... (0 Replies)
Discussion started by: dev123
0 Replies
LEARN ABOUT REDHAT
rndc.conf
RNDC.CONF(5)RNDC.CONF(5)NAME
rndc.conf - rndc configuration file
SYNOPSIS
rndc.conf
DESCRIPTION
rndc.conf is the configuration file for rndc, the BIND 9 name server control utility. This file has a similar structure and syntax to
named.conf. Statements are enclosed in braces and terminated with a semi-colon. Clauses in the statements are also semi-colon terminated.
The usual comment styles are supported:
C style: /* */
C++ style: // to end of line
Unix style: # to end of line
rndc.conf is much simpler than named.conf. The file uses three statements: an options statement, a server statement and a key statement.
The options statement contains three clauses. The default-server clause is followed by the name or address of a name server. This host
will be used when no name server is given as an argument to rndc. The default-key clause is followed by the name of a key which is identi-
fied by a key statement. If no keyid is provided on the rndc command line, and no key clause is found in a matching server statement, this
default key will be used to authenticate the server's commands and responses. The default-port clause is followed by the port to connect to
on the remote name server. If no port option is provided on the rndc command line, and no port clause is found in a matching server state-
ment, this default port will be used to connect.
After the server keyword, the server statement includes a string which is the hostname or address for a name server. The statement has two
possible clauses: key and port. The key name must match the name of a key statement in the file. The port number specifies the port to con-
nect to.
The key statement begins with an identifying string, the name of the key. The statement has two clauses. algorithm identifies the encryp-
tion algorithm for rndc to use; currently only HMAC-MD5 is supported. This is followed by a secret clause which contains the base-64 encod-
ing of the algorithm's encryption key. The base-64 string is enclosed in double quotes.
There are two common ways to generate the base-64 string for the secret. The BIND 9 program rndc-confgen can be used to generate a random
key, or the mmencode program, also known as mimencode, can be used to generate a base-64 string from known input. mmencode does not ship
with BIND 9 but is available on many systems. See the EXAMPLE section for sample command lines for each.
EXAMPLE
options {
default-server localhost;
default-key samplekey;
};
server localhost {
key samplekey;
};
key samplekey {
algorithm hmac-md5;
secret "c3Ryb25nIGVub3VnaCBmb3IgYSBtYW4gYnV0IG1hZGUgZm9yIGEgd29tYW4K";
};
In the above example, rndc will by default use the server at localhost (127.0.0.1) and the key called samplekey. Commands to the localhost
server will use the samplekey key, which must also be defined in the server's configuration file with the same name and secret. The key
statement indicates that samplekey uses the HMAC-MD5 algorithm and its secret clause contains the base-64 encoding of the HMAC-MD5 secret
enclosed in double quotes.
To generate a random secret with rndc-confgen:
rndc-confgen
A complete rndc.conf file, including the randomly generated key, will be written to the standard output. Commented out key and controls
statements for named.conf are also printed.
To generate a base-64 secret with mmencode:
echo "known plaintext for a secret" | mmencode
NAME SERVER CONFIGURATION
The name server must be configured to accept rndc connections and to recognize the key specified in the rndc.conf file, using the controls
statement in named.conf. See the sections on the controls statement in the BIND 9 Administrator Reference Manual for details.
SEE ALSO rndc(8), rndc-confgen(8), mmencode(1), BIND 9 Administrator Reference Manual.
AUTHOR
Internet Software Consortium
BIND9 June 30, 2000 RNDC.CONF(5)