P.S. I've noticed that you're using a GNU syntax (most likely you're executing the script on Linux),
so the -q option of grep should be available
Oh thank you so much - it works now!!!
Quote:
Originally Posted by Corona688
You don't have to run cut hundreds of times in backticks. Use the read command once.
'host' might be outputting to stderr, try 2>&1
I'm sure my script is very novice and sophmoric and I do plan to learn more but I'm just in a situation where, figuratively (not really), I've got a boss standing over me saying "YOU BETTER GET THOSE REPORTS IN ORDER AND YOU'RE NOT LEAVING THE OFFICE TILL YOU DO" so I'm just trying to do my best to maintain. I will check the suggestion you mentioned and read more on the bash scripting guide. Thank you both!
need to check on some hosts and send an email if there status changes
I wanna put together a script in bash that will allow me to check the up/down state of a single host via ping
i want it to run in a continuous loop so I can just fire the script and forget about it(dont want cron to drive... (2 Replies)
Guys look at this:
i have to write a script that takes a file as an argument. The script should be able to determine what permissions the owner, group and everybody has for the file passed in. The output should be displayed similar to this.
READ WRITE EXECUTE
OWNER LEE.BALLANCORE YES YES NO... (9 Replies)
Hi ,
I have a doubt on condition test ( ] ). Pls refer blow program.
#!/bin/ksh
TEMP=
if ;then
echo $TEMP
else
print 'invalid option'
fi
Above script's TEMP variable has no value so it gives "invalid option" as output. But I got an error before priting the string .
Result :
... (2 Replies)
Hi there,
When I try to do a condition on test:
$ str1=abcd
$ test $str1
$ echo $?
0
Is there anyway to display the answer to be 'TRUE' or 'YES'? rather than 0?
If so, how can I do it without using awk or sed. (2 Replies)
Hello,
what is the better and correct way to perform a comparison:
I have been using the following with no problems:
if ]
then ....
fi
I have seen this also used :
if
then ....
fi
When I try :
if
then ....
fi
I get an error like .... the test condition expects a... (4 Replies)
Hi there,
I tried to search for this almost everywhere, but didnt get any proper information on it.
What is the difference between
]
Some of the code works when I have only single condition i.e.
] && $dothis1 || $dothis2
But if i try to include another testcondition to the... (1 Reply)
Dear All,
I need to build a mechanism by which I can log if any node in my DC is pinging my server or not ?
The purpose is al follows:
Incase any node in my Data Center turns off , I need to have a mechanism by which I am notified that a certain node is no longer responding.
On my... (1 Reply)
Without grep, I'd like to make a test condition so that any a word that does not have the successive letters car in it will be echoed. for example, bluecar will contain "car" so it will show up as a no
var=bluecar
$ echo $var|if ]; then echo "yes";fi
yes
this variable contains "car" so I... (5 Replies)
i have to test a condition for n times and if its value is greater than one each time for continuous 5 iterations it will take action
My Approach
run the same command 5 times in for loop and divert the output to a file and then read the values from file and use if else if and take action
... (1 Reply)
Discussion started by: abhaydas
1 Replies
LEARN ABOUT REDHAT
ypdomainname
HOSTNAME(1) Linux Programmer's Manual HOSTNAME(1)NAME
hostname - show or set the system's host name
domainname - show or set the system's NIS/YP domain name
dnsdomainname - show the system's DNS domain name
nisdomainname - show or set system's NIS/YP domain name
ypdomainname - show or set the system's NIS/YP domain name
nodename - show or set the system's DECnet node name
SYNOPSIS
hostname [-v] [-a] [--alias] [-d] [--domain] [-f] [--fqdn] [-i] [--ip-address] [--long] [-s] [--short] [-y] [--yp] [--nis] [-n] [--node]
hostname [-v] [-F filename] [--file filename] [hostname]
domainname [-v] [-F filename] [--file filename] [name]
nodename [-v] [-F filename] [--file filename] [name]
hostname [-v] [-h] [--help] [-V] [--version]
dnsdomainname [-v]
nisdomainname [-v]
ypdomainname [-v]
DESCRIPTION
Hostname is the program that is used to either set or display the current host, domain or node name of the system. These names are used by
many of the networking programs to identify the machine. The domain name is also used by NIS/YP.
GET NAME
When called without any arguments, the program displays the current names:
hostname will print the name of the system as returned by the gethostname(2) function.
domainname, nisdomainname, ypdomainname will print the name of the system as returned by the getdomainname(2) function. This is also known
as the YP/NIS domain name of the system.
nodename will print the DECnet node name of the system as returned by the getnodename(2) function.
dnsdomainname will print the domain part of the FQDN (Fully Qualified Domain Name). The complete FQDN of the system is returned with host-
name --fqdn.
SET NAME
When called with one argument or with the --file option, the commands set the host name, the NIS/YP domain name or the node name.
Note, that only the super-user can change the names.
It is not possible to set the FQDN or the DNS domain name with the dnsdomainname command (see THE FQDN below).
The host name is usually set once at system startup in /etc/rc.d/rc.inet1 or /etc/init.d/boot (normally by reading the contents of a file
which contains the host name, e.g. /etc/hostname).
THE FQDN
You can't change the FQDN (as returned by hostname --fqdn) or the DNS domain name (as returned by dnsdomainname) with this command. The
FQDN of the system is the name that the resolver(3) returns for the host name.
Technically: The FQDN is the name gethostbyname(2) returns for the host name returned by gethostname(2). The DNS domain name is the part
after the first dot.
Therefore it depends on the configuration (usually in /etc/host.conf) how you can change it. Usually (if the hosts file is parsed before
DNS or NIS) you can change it in /etc/hosts.
OPTIONS -a, --alias
Display the alias name of the host (if used).
-d, --domain
Display the name of the DNS domain. Don't use the command domainname to get the DNS domain name because it will show the NIS domain
name and not the DNS domain name. Use dnsdomainname instead.
-F, --file filename
Read the host name from the specified file. Comments (lines starting with a `#') are ignored.
-f, --fqdn, --long
Display the FQDN (Fully Qualified Domain Name). A FQDN consists of a short host name and the DNS domain name. Unless you are using
bind or NIS for host lookups you can change the FQDN and the DNS domain name (which is part of the FQDN) in the /etc/hosts file.
-h, --help
Print a usage message and exit.
-i, --ip-address
Display the IP address(es) of the host.
-n, --node
Display the DECnet node name. If a parameter is given (or --file name ) the root can also set a new node name.
-s, --short
Display the short host name. This is the host name cut at the first dot.
-V, --version
Print version information on standard output and exit successfully.
-v, --verbose
Be verbose and tell what's going on.
-y, --yp, --nis
Display the NIS domain name. If a parameter is given (or --file name ) then root can also set a new NIS domain.
FILES
/etc/hosts
AUTHOR
Peter Tobias, <tobias@et-inf.fho-emden.de>
Bernd Eckenfels, <net-tools@lina.inka.de> (NIS and manpage).
Steve Whitehouse, <SteveW@ACM.org> (DECnet support and manpage).
net-tools 28 Jan 1996 HOSTNAME(1)