How to see which package provides certain tool or file

rpm -qf `which lstopo`

How to add an administrator to IPMI interface

[root@olsnba08 ~]# modprobe ipmi_devintf
[root@olsnba08 ~]# ipmitool user list 1
ID  Name      Callin  Link Auth IPMI Msg   Channel Priv Limit
1                    false   false      true       ADMINISTRATOR
2   root             false   true       true       ADMINISTRATOR
3   test1            false   false      true       ADMINISTRATOR
4   test2            false   false      true       ADMINISTRATOR
5   test3            false   false      true       ADMINISTRATOR
6   gbitzes          true    true       true       ADMINISTRATOR

[root@olsnba08 ~]# ipmitool user set name 7 admin
[root@olsnba08 ~]# ipmitool user set password 7
Password for user 7: 
Password for user 7: 
[root@olsnba08 ~]# ipmitool channel setaccess 1 7 link=on ipmi=on callin=on privilege=4
[root@olsnba08 ~]# ipmitool user enable 7

How to see content of a package under Linux

For an rpm file not yet installed:

rpm -qlp /path/to/file.rpm

For a package that is already installed: Red Hat:

repoquery -lq package_name

Ubuntu, Debian:

dpkg-query --listfiles package_name

BMC is in FW Transfer Mode

This is a message that I get when trying to remotely update the BIOS on Jefferson Pass systems equipped with Intel S2600JF mother boards and Intel E5-2690 Sandy Bridge CPUs. The solution is to do BMC cold reset using ipmi and wait for 30 seconds:

ipmitool mc reset cold

If IPMI kernel module happens not to be loaded, then load it with this command:

modprobe ipmi_devintf

How to compare two directory trees

When you want to see which files differ without further details:

diff -qr path/1/ path/2/

With a separate diff for each differing file:

diff -r path/1/ path/2/

Cheers.

How to find out the number of global variables in a binary

nm your-binary-file | grep '[0-9A-Fa-f]* [BCDGRS]' |cut -d ' ' -f 3 | grep -ve '__.*' | grep -v @@ | wc -l

How to install a network printer at CERN under Ubuntu

Installing a driver at CERN is kind of a puzzle, unless you run Windows or SLC. Unfortunately there are no tutorials how to do that. This is why I came up with the following, somewhat hackerish, solution:

1. Install packages libnet-ldap-perl and cups on your system using apt-get
2. Download the lpadmincern RPM package.
3. Unpack it.
4. Replace inside lpadmincern.pl

   my $cupsc='/sbin/service cups reload';

   with

   my $cupsc='/usr/sbin/service cups reload';

5. Replace
   

$command="LC_ALL=C /usr/sbin/lpadmin -p $prt->{printerName} -L \"$prt->{location}\" -D \"$prt->{description}\" -v $uri $duplex $media -o printer-is-shared=false -E";

with

$command="LC_ALL=C /usr/sbin/lpadmin -p $prt->{printerName} -L \"$prt->{location}\" -P $prt->{ppdfile} -D \"$prt->{description}\" -v $uri $duplex $media -o printer-is-shared=false -E";

Apparently this got replaced in the meanwhile.
6. install libnet-ldap-perl
7. Find your desired printer at CERN printing service
8. Move the whole directory to /usr/share/lpadmincern, otherwise it would complain about a missing directory.
9. Run

   perl lpadmincern.pl --add [your-printer-name-here]