Commit a linear git history to subversion
Issue: I was recently asked to integrate my local development (which I had done under git management) into our central Subversion server. How to do this while preserving my commit history?
Resolution: After a lot of reading (and an upgrade to git-1.7.0) I found the following recipe to work for me.
git-svn init svn://repo.domain.local/Project/trunk/sub/directory
git-svn fetch
git checkout -b svnrebase git-svn
git-svn rebase
git rebase --root --onto svnrebase master
git-svn dcommit
Reformat and reindent an XML file
This is easy to accomplish with xmllint and a shell one-liner:
xinetd per_source limit issues
Issue:
Users note availability issues when accessing services backed by xinetd (subversion, rsync, etc.)
Identification:
Syslog on the affected server will present multiple lines containing daemon per_source_limit for 0.0.0.0.
Cause:
You have exceeded per_source_limit defaults imposed by your xinetd configuration. Many distributions include per_source limits that may not be suitable for your use case. Evaluate your needs carefully.
Resolution:
Modify the default setting for per_source in /etc/xinetd.conf or modify the service specific configuration (recommended) under /etc/xinet.d. per_source limits may be set as follows:
per_source may be set to an integer or UNLIMITED (the number represents the number of connections allowed per host). A sensible fixed value is always better than UNLIMITED.
Reference: xinetd.conf(5)
Reset The Windows Update Catalog
- Insert the Windows Vista installation disc in the disc drive, and then restart the computer.
- When you are prompted to restart from the disc, press any key.
- When you are prompted, configure the Language to install, Time and currency format , and Keyboard or input method options that you want, and then click Next .
- On the Install Windows page, click Repair your computer .
- On the System Recovery Options page, click the version of the Windows Vista operating system that you want to repair, and then click Next
- On the System Recovery Options page, click Command Prompt .
- Type cd C:\windows\winsxs , and then press ENTER.
- Type ren pending.xml pending.old , and then press ENTER.
- In Registry Editor, locate and then delete the following registry subkey:
- At the command prompt, type exit to exit Registry Editor. Press ENTER.
- Click Restart
HKLM\Offline Components\PendingXmlIdentifier
HKLM\Offline Components\NextQueueEntryIndex
Reference: http://social.answers.microsoft.com/Forums/en-US/vistawu/thread/13dec2a0-2694-4b11-9b0c-9b8fbe6162ee
Reset HP Integrated Lights Out Board to Factory Defaults
Issue:
Cannot login to HP Integrated Lights Out Board (bad credentials).
Cause:
Someone failed to record the configuration.
Solution:
If an operating system supported by HP Proliant Essentials is installed along with a recent Proliant Support Pack, you may reset the Integrated Lights Out board to its factory defaults. Use the HP Lights-Out Online Configuration utility.
Honor Guest IDE/SATA Flush Requests
Issue:
VirtualBox ignores IDE/SATA disk flush requests.
Cause:
This is by design. To improve performance VirtualBox ignores these requests. This can create an issue with filesystems that do not have fsck-like tools (ZFS is an example) create a situation where the on disk information is inconsistent due to data held in RAM.
Solution:
To enable flushing for IDE disks, issue the following command:
"VBoxInternal/Devices/piix3ide/0/LUN#[x]/Config/IgnoreFlush" 0
The value [x] that selects the disk is 0 for the master device on the first channel, 1 for the slave device on the first channel, 2 for the master device on the second channel or 3 for the master device on the second channel.
To enable flushing for SATA disks, issue the following command:
"VBoxInternal/Devices/ahci/0/LUN#[x]/Config/IgnoreFlush" 0
The value [x] that selects the disk can be a value between 0 and 29.
Reference: http://www.virtualbox.org/manual/UserManual.html#id2499944
Replace Pipes with Tabs in a Delimited File
Issue:
It is often necessary to replace delimiters in a file with a form the receiving party expects. sed is my favorite method of meeting the need.
Solution:
Replace double pipes with tabs
Note: If you find the tab key simply does not work, try CTRL+V+I from your terminal.
Reference: http://forums.devshed.com/unix-help-35/replacing-tabs-with-spaces-372623.html
Caveats:
Special consideration (and a regex) will be required for data where delimiters are present in the data itself. Consider your use case and apply appropriately.
Remove a Range of Unwanted ZFS Snapshots from the Command Line
Remove a range of unwanted snapshots, from the command line, if necessary.
In the following example, all automatic snapshots in the bash shell are removed.
One could add a secondary pipe and grep statement to filter on individual file systems.
Create a pidof command to find PID numbers easily
Most UNIX environments include the pidof command which is put to use whenever one needs to quickly determine, by name, the pid of a running program. Apple's Mac OS X lacks the pidof command, however, one may approximate its function with the following shell script:
ps axc|awk "{if (\$5==\"$1\") print \$1}";
Save the script as /bin/pidof and be sure to set its executable bit: