Re: Script Test [OT]
On 08Sep2008 21:04, Kevin J. Cummings [EMAIL PROTECTED] wrote: Alan Evans wrote: On Mon, Sep 8, 2008 at 6:40 AM, Steven Tardy [EMAIL PROTECTED] wrote: kwhiskerz wrote: man hostid On my Fedora 9... $ hostid Now I haven't bothered to check any other machines, but my initial impression is that this is not going to work... I just checked the hostids on my 2 primary machines on the same local network. They just seem to be encodings of the machine's IP addresses. And since both are PC class machines, the addresses look to be syllable swapped (but not byte swapped). 192.168.6.94 and 192.168.6.106 a8c05e06 and a8c06a06 So, I have to ask, does the machine you tried it on have an IP address? So, let us turn to the docs: man hostid says: hostid - print the numeric identifier for the current host [...] The full documentation for hostid is maintained as a Texinfo manual [...] Gah. I hate this info-so-no-f'n-man-page rubbish! But let's go: info hostid: 21.4 `hostid': Print numeric host identifier. = `hostid' prints the numeric identifier of the current host in hexadecimal. This command accepts no arguments. The only options are `--help' and `--version'. *Note Common options::. For example, here's what it prints on one system I use: $ hostid 1bac013d On that system, the 32-bit quantity happens to be closely related to the system's Internet address, but that isn't always the case. Gah! Again! I don't think I'd rely on hostid for anything:-( Cheers, -- Cameron Simpson [EMAIL PROTECTED] DoD#743 http://www.cskk.ezoshosting.com/cs/ A good newspaper is never good enough, but a lousy newspaper is a joy forever.- Garrison Keillor -- fedora-list mailing list fedora-list@redhat.com To unsubscribe: https://www.redhat.com/mailman/listinfo/fedora-list Guidelines: http://fedoraproject.org/wiki/Communicate/MailingListGuidelines
Re: Script Test [OT]
Cameron Simpson wrote: On 08Sep2008 21:04, Kevin J. Cummings [EMAIL PROTECTED] wrote: Alan Evans wrote: On Mon, Sep 8, 2008 at 6:40 AM, Steven Tardy [EMAIL PROTECTED] wrote: kwhiskerz wrote: man hostid On my Fedora 9... $ hostid Now I haven't bothered to check any other machines, but my initial impression is that this is not going to work... I just checked the hostids on my 2 primary machines on the same local network. They just seem to be encodings of the machine's IP addresses. And since both are PC class machines, the addresses look to be syllable swapped (but not byte swapped). 192.168.6.94 and 192.168.6.106 a8c05e06 and a8c06a06 So, I have to ask, does the machine you tried it on have an IP address? So, let us turn to the docs: man hostid says: hostid - print the numeric identifier for the current host [...] The full documentation for hostid is maintained as a Texinfo manual [...] Gah. I hate this info-so-no-f'n-man-page rubbish! But let's go: info hostid: 21.4 `hostid': Print numeric host identifier. = `hostid' prints the numeric identifier of the current host in hexadecimal. This command accepts no arguments. The only options are `--help' and `--version'. *Note Common options::. For example, here's what it prints on one system I use: $ hostid 1bac013d On that system, the 32-bit quantity happens to be closely related to the system's Internet address, but that isn't always the case. Gah! Again! I don't think I'd rely on hostid for anything:-( Cheers, Hi, seeing the same (using dhcp for getting an ip address): [EMAIL PROTECTED] [backes]: hostid [EMAIL PROTECTED] [backes]: ifconfig eth0 Link encap:Ethernet HWaddr 00:0C:76:C0:40:36 inet addr:192.168.179.182 Bcast:192.168.179.255 Mask:255.255.255.0 UP BROADCAST RUNNING MULTICAST MTU:1500 Metric:1 RX packets:284 errors:0 dropped:0 overruns:0 frame:0 TX packets:256 errors:0 dropped:0 overruns:0 carrier:0 collisions:0 txqueuelen:1000 RX bytes:86392 (84.3 KiB) TX bytes:25620 (25.0 KiB) Interrupt:22 Base address:0x2000 Not seeing this effect on systems without dhcp usage. Regards -- Joachim Backes [EMAIL PROTECTED] smime.p7s Description: S/MIME Cryptographic Signature -- fedora-list mailing list fedora-list@redhat.com To unsubscribe: https://www.redhat.com/mailman/listinfo/fedora-list Guidelines: http://fedoraproject.org/wiki/Communicate/MailingListGuidelines
Re: Script Test [OT]
[EMAIL PROTECTED] wrote: Cameron Simpson wrote: On 08Sep2008 21:04, Kevin J. Cummings [EMAIL PROTECTED] wrote: Alan Evans wrote: On Mon, Sep 8, 2008 at 6:40 AM, Steven Tardy [EMAIL PROTECTED] wrote: kwhiskerz wrote: man hostid On my Fedora 9... $ hostid Now I haven't bothered to check any other machines, but my initial impression is that this is not going to work... I just checked the hostids on my 2 primary machines on the same local network. They just seem to be encodings of the machine's IP addresses. And since both are PC class machines, the addresses look to be syllable swapped (but not byte swapped). 192.168.6.94 and 192.168.6.106 a8c05e06 and a8c06a06 So, I have to ask, does the machine you tried it on have an IP address? So, let us turn to the docs: man hostid says: hostid - print the numeric identifier for the current host [...] The full documentation for hostid is maintained as a Texinfo manual [...] Gah. I hate this info-so-no-f'n-man-page rubbish! But let's go: info hostid: 21.4 `hostid': Print numeric host identifier. = `hostid' prints the numeric identifier of the current host in hexadecimal. This command accepts no arguments. The only options are `--help' and `--version'. *Note Common options::. For example, here's what it prints on one system I use: $ hostid 1bac013d On that system, the 32-bit quantity happens to be closely related to the system's Internet address, but that isn't always the case. Gah! Again! I don't think I'd rely on hostid for anything:-( Cheers, Hi, seeing the same (using dhcp for getting an ip address): [EMAIL PROTECTED] [backes]: hostid [EMAIL PROTECTED] [backes]: ifconfig eth0 Link encap:Ethernet HWaddr 00:0C:76:C0:40:36 inet addr:192.168.179.182 Bcast:192.168.179.255 Mask:255.255.255.0 UP BROADCAST RUNNING MULTICAST MTU:1500 Metric:1 RX packets:284 errors:0 dropped:0 overruns:0 frame:0 TX packets:256 errors:0 dropped:0 overruns:0 carrier:0 collisions:0 txqueuelen:1000 RX bytes:86392 (84.3 KiB) TX bytes:25620 (25.0 KiB) Interrupt:22 Base address:0x2000 Not seeing this effect on systems without dhcp usage. Regards FYI, the hostid does not use information from ifconfig. It looks for a match between hostname -s and information in /etc/hosts. It then uses the IP address contained there. No match then hostid returns . -- Television is a medium because anything well done is rare. -- attributed to both Fred Allen and Ernie Kovacs -- fedora-list mailing list fedora-list@redhat.com To unsubscribe: https://www.redhat.com/mailman/listinfo/fedora-list Guidelines: http://fedoraproject.org/wiki/Communicate/MailingListGuidelines
Re: Script Test [OT]
Ed Greshko wrote: [EMAIL PROTECTED] wrote: Cameron Simpson wrote: On 08Sep2008 21:04, Kevin J. Cummings [EMAIL PROTECTED] wrote: Alan Evans wrote: On Mon, Sep 8, 2008 at 6:40 AM, Steven Tardy [EMAIL PROTECTED] wrote: kwhiskerz wrote: man hostid On my Fedora 9... $ hostid Now I haven't bothered to check any other machines, but my initial impression is that this is not going to work... I just checked the hostids on my 2 primary machines on the same local network. They just seem to be encodings of the machine's IP addresses. And since both are PC class machines, the addresses look to be syllable swapped (but not byte swapped). 192.168.6.94 and 192.168.6.106 a8c05e06 and a8c06a06 So, I have to ask, does the machine you tried it on have an IP address? So, let us turn to the docs: man hostid says: hostid - print the numeric identifier for the current host [...] The full documentation for hostid is maintained as a Texinfo manual [...] Gah. I hate this info-so-no-f'n-man-page rubbish! But let's go: info hostid: 21.4 `hostid': Print numeric host identifier. = `hostid' prints the numeric identifier of the current host in hexadecimal. This command accepts no arguments. The only options are `--help' and `--version'. *Note Common options::. For example, here's what it prints on one system I use: $ hostid 1bac013d On that system, the 32-bit quantity happens to be closely related to the system's Internet address, but that isn't always the case. Gah! Again! I don't think I'd rely on hostid for anything:-( Cheers, Hi, seeing the same (using dhcp for getting an ip address): [EMAIL PROTECTED] [backes]: hostid [EMAIL PROTECTED] [backes]: ifconfig eth0 Link encap:Ethernet HWaddr 00:0C:76:C0:40:36 inet addr:192.168.179.182 Bcast:192.168.179.255 Mask:255.255.255.0 UP BROADCAST RUNNING MULTICAST MTU:1500 Metric:1 RX packets:284 errors:0 dropped:0 overruns:0 frame:0 TX packets:256 errors:0 dropped:0 overruns:0 carrier:0 collisions:0 txqueuelen:1000 RX bytes:86392 (84.3 KiB) TX bytes:25620 (25.0 KiB) Interrupt:22 Base address:0x2000 Not seeing this effect on systems without dhcp usage. Regards FYI, the hostid does not use information from ifconfig. It looks for a match between hostname -s and information in /etc/hosts. It then uses the IP address contained there. No match then hostid returns . Oooop... Correction. It uses hostname for the matchnot hostname -r Also, it will take the info in /etc/hosts first and if no match will do a DNS lookup. -- He knew the tavernes well in every toun. -- Geoffrey Chaucer -- fedora-list mailing list fedora-list@redhat.com To unsubscribe: https://www.redhat.com/mailman/listinfo/fedora-list Guidelines: http://fedoraproject.org/wiki/Communicate/MailingListGuidelines
Re: Script Test [OT]
Alan Evans wrote: On Mon, Sep 8, 2008 at 6:40 AM, Steven Tardy [EMAIL PROTECTED] wrote: kwhiskerz wrote: Is there a way a script can determine which computer it is running on and refuse to run if it is on the wrong computer? man hostid On my Fedora 9... $ hostid Now I haven't bothered to check any other machines, but my initial impression is that this is not going to work... Was there some reason you couldn't use the UUID script I posted? -- Bill Davidsen [EMAIL PROTECTED] We have more to fear from the bungling of the incompetent than from the machinations of the wicked. - from Slashdot -- fedora-list mailing list fedora-list@redhat.com To unsubscribe: https://www.redhat.com/mailman/listinfo/fedora-list Guidelines: http://fedoraproject.org/wiki/Communicate/MailingListGuidelines
Re: Script Test [OT]
kwhiskerz wrote: This is OT, but perhaps someone knows an answer. Is there a way a script can determine which computer it is running on and refuse to run if it is on the wrong computer? if [ some case ]; then run else don't run fi man hostid -- fedora-list mailing list fedora-list@redhat.com To unsubscribe: https://www.redhat.com/mailman/listinfo/fedora-list Guidelines: http://fedoraproject.org/wiki/Communicate/MailingListGuidelines
Re: Script Test [OT]
On Mon, Sep 8, 2008 at 6:40 AM, Steven Tardy [EMAIL PROTECTED] wrote: kwhiskerz wrote: Is there a way a script can determine which computer it is running on and refuse to run if it is on the wrong computer? man hostid On my Fedora 9... $ hostid Now I haven't bothered to check any other machines, but my initial impression is that this is not going to work... -- fedora-list mailing list fedora-list@redhat.com To unsubscribe: https://www.redhat.com/mailman/listinfo/fedora-list Guidelines: http://fedoraproject.org/wiki/Communicate/MailingListGuidelines
Re: Script Test [OT]
Alan Evans wrote: On Mon, Sep 8, 2008 at 6:40 AM, Steven Tardy [EMAIL PROTECTED] wrote: kwhiskerz wrote: Is there a way a script can determine which computer it is running on and refuse to run if it is on the wrong computer? man hostid On my Fedora 9... $ hostid Now I haven't bothered to check any other machines, but my initial impression is that this is not going to work... I just checked the hostids on my 2 primary machines on the same local network. They just seem to be encodings of the machine's IP addresses. And since both are PC class machines, the addresses look to be syllable swapped (but not byte swapped). 192.168.6.94 and 192.168.6.106 a8c05e06 and a8c06a06 So, I have to ask, does the machine you tried it on have an IP address? -- Kevin J. Cummings [EMAIL PROTECTED] [EMAIL PROTECTED] [EMAIL PROTECTED] Registered Linux User #1232 (http://counter.li.org) -- fedora-list mailing list fedora-list@redhat.com To unsubscribe: https://www.redhat.com/mailman/listinfo/fedora-list Guidelines: http://fedoraproject.org/wiki/Communicate/MailingListGuidelines
Re: Script Test [OT]
On Sat, Sep 06, 2008 at 02:27:27AM -0600, kwhiskerz wrote: This is OT, but perhaps someone knows an answer. Is there a way a script can determine which computer it is running on and refuse to run if it is on the wrong computer? if [ some case ]; then if [ $(hostname -s) = puter ]; then echo running fi Or, for multiple cases: case $(hostname -s) in ws*) do_something ;; db*|app*) do_other ;; esac -- lfr 0/0 pgp2CXYlUmOh1.pgp Description: PGP signature -- fedora-list mailing list fedora-list@redhat.com To unsubscribe: https://www.redhat.com/mailman/listinfo/fedora-list Guidelines: http://fedoraproject.org/wiki/Communicate/MailingListGuidelines
Re: Script Test [OT]
if [ some case ]; then if [ $(hostname -s) = puter ]; then echo running fi I'd check how the hostname command runs on your computer, See what happens on my F8 system: [EMAIL PROTECTED] ~]$ hostname confianza [EMAIL PROTECTED] ~]$ hostname -s localhost [EMAIL PROTECTED] ~]$ the -s option returns 'localhost' so it will never = the name of your computer. Dennis __ Correo Yahoo! Espacio para todos tus mensajes, antivirus y antispam ¡gratis! Regístrate ya - http://correo.yahoo.com.mx/ -- fedora-list mailing list fedora-list@redhat.com To unsubscribe: https://www.redhat.com/mailman/listinfo/fedora-list Guidelines: http://fedoraproject.org/wiki/Communicate/MailingListGuidelines
Re: Script Test [OT]
The problem is that both computers return hostname = localhost, so that won't work. IP address is not always possible, as the network might not be up, especially on the laptop. How would I check the HWaddress (MAC)? As ifconfig returns a whole list of things: 1.How can I isolate just 00:xx:xx:xx:xx:xx in order to make a comparision? 2.How do I make this comparison in bash? I guess this value must be a string? -- fedora-list mailing list fedora-list@redhat.com To unsubscribe: https://www.redhat.com/mailman/listinfo/fedora-list Guidelines: http://fedoraproject.org/wiki/Communicate/MailingListGuidelines
Re: Script Test [OT]
A suggestion I found on the net is to test for the value of md5sum /etc/passwd. Now, does this stay the same, even if a password is added or changed? Is it unique to a computer? And also, how do I isolate the number and strip off the space and /etc/passwd from the result? -- fedora-list mailing list fedora-list@redhat.com To unsubscribe: https://www.redhat.com/mailman/listinfo/fedora-list Guidelines: http://fedoraproject.org/wiki/Communicate/MailingListGuidelines
Re: Script Test [OT]
On Sat, 2008-09-06 at 11:54 -0600, kwhiskerz wrote:
The problem is that both computers return hostname = localhost, so that won't
work. IP address is not always possible, as the network might not be up,
especially on the laptop.
How would I check the HWaddress (MAC)?
As ifconfig returns a whole list of things:
1.How can I isolate just 00:xx:xx:xx:xx:xx in order to make a comparision?
/sbin/ifconfig eth0|awk 'NR==1 {print $5}'
(adjust for your primary interface name). Note that this isn't
identifying the machine, it's identifying a network interface, but that
may be good enough for your purpose.
2.How do I make this comparison in bash? I guess this value must be a string?
if [ $(/sbin/ifconfig eth0|awk 'NR==1 {print $5}') = 00:16:76:C2:87:D2 ]
then
echo yes
else
echo no
fi
poc
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Re: Script Test [OT]
kwhiskerz wrote: The problem is that both computers return hostname = localhost, so that won't work. IP address is not always possible, as the network might not be up, especially on the laptop. How would I check the HWaddress (MAC)? As ifconfig returns a whole list of things: 1.How can I isolate just 00:xx:xx:xx:xx:xx in order to make a comparision? Just grep for it, you only need to verify that it is there, not isolate it. 2.How do I make this comparison in bash? I guess this value must be a string? Use grep's return status instead of doing things the shell doesn't does as well. if ! ifconfig eth0 | grep -q 00:xx:xx:xx:xx:xx then echo 'wrong box' exit 1 fi ..rest of script.. You could also find this value in /etc/sysconfig/network-scripts/ifcfg-eth0 -- Les Mikesell [EMAIL PROTECTED] -- fedora-list mailing list fedora-list@redhat.com To unsubscribe: https://www.redhat.com/mailman/listinfo/fedora-list Guidelines: http://fedoraproject.org/wiki/Communicate/MailingListGuidelines
Re: Script Test [OT]
On 06Sep2008 12:01, kwhiskerz [EMAIL PROTECTED] wrote: | A suggestion I found on the net is to test for the value of md5sum | /etc/passwd. That's horrible. Unreliable, etc. | Now, does this stay the same, even if a password is added or | changed? With shadow passwords, yes. But if someone: changes their name, changes their shell, changes their homedir, a new user is added, a user is deleted. All these will break the test. | Is it unique to a computer? And it is not unique. It is a very bad suggestion. Just check hostname (and maybe domainname, depending how widely your test needs to wordk). | And also, how do I isolate the number and | strip off the space and /etc/passwd from the result? With cut or sed or awk or perl or ... But since it is a signature, who cares if the filename is there or not? Just compare the full thing. Seriously, don't do the md5sum thing. Personally, I try to set up three environment variables: $HOSTNAME, being the full hostname (foo.example.com), $HOST, being the shortname (foo) and $SYSTEMID being what I call the administrative zone (home at home, cisra at a former workplace of that name, etc). These are all arbitrary and of course need special setup everywhere, but once they are there it is possible to make sensible comparison statements. Then the problem moves from an ad hoc test in a script to maintaining these variables, which at least is a better defined problem. So my scripts which care tend to say: case [EMAIL PROTECTED] in [EMAIL PROTECTED]) # my laptop ... ... ;; esac and so forth. Cheers, -- Cameron Simpson [EMAIL PROTECTED] DoD#743 http://www.cskk.ezoshosting.com/cs/ I am returning this otherwise good typing paper to you because someone has printed gibberish all over it and put your name at the top. - English Professor, Ohio University -- fedora-list mailing list fedora-list@redhat.com To unsubscribe: https://www.redhat.com/mailman/listinfo/fedora-list Guidelines: http://fedoraproject.org/wiki/Communicate/MailingListGuidelines
Re: Script Test [OT]
I will see if I can make the HWaddr test work. Thanks, those are great suggestions. -- fedora-list mailing list fedora-list@redhat.com To unsubscribe: https://www.redhat.com/mailman/listinfo/fedora-list Guidelines: http://fedoraproject.org/wiki/Communicate/MailingListGuidelines
Re: Script Test [OT]
kwhiskerz wrote: The problem is that both computers return hostname = localhost, so that won't work. IP address is not always possible, as the network might not be up, especially on the laptop. How would I check the HWaddress (MAC)? As ifconfig returns a whole list of things: 1.How can I isolate just 00:xx:xx:xx:xx:xx in order to make a comparision? 2.How do I make this comparison in bash? I guess this value must be a string? Wrong approach (that means I don't know how to do it reliably). Try this instead, it needs to be run as root: #!/bin/bash # get the root device rt_dev=$(df / | sed -n '2s/ .*//p' # get the UUID in a shell variable fsid=$(dumpe2fs -h $rt_dev | sed -n '/UUID:/s/.*: *//p') # now you can test it against one or more systems # if they NFS mount their root like dickless workstations # you have to test something else like /tmp -- Bill Davidsen [EMAIL PROTECTED] We have more to fear from the bungling of the incompetent than from the machinations of the wicked. - from Slashdot -- fedora-list mailing list fedora-list@redhat.com To unsubscribe: https://www.redhat.com/mailman/listinfo/fedora-list Guidelines: http://fedoraproject.org/wiki/Communicate/MailingListGuidelines
Re: Script Test [OT]
Tried it on both computers. Works great! Neither will run the other's script. Fantastic! THANKS :-) -- fedora-list mailing list fedora-list@redhat.com To unsubscribe: https://www.redhat.com/mailman/listinfo/fedora-list Guidelines: http://fedoraproject.org/wiki/Communicate/MailingListGuidelines
