Category Archives: Tips

Short entries sharing small technical obstacles that I’ve overcome.

DD Progress

Sometimes you’ll want to know how far along ‘dd’ is in a copy. It’s not hard to do but it’s hard to remember. If you send a USR1 signal to the ‘dd’ process it will print the current progress. Here’s … Continue reading

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Mixing Static and Dynamic Linkage

Using GNU tools you can mix static and dynamic linkage using: gcc foo.o -Wl,-Bstatic -lstatic1 -lstatic2 -Wl,-Bdynamic -ldynamic1 Just be careful. The way the linker resolves symbols in static libraries is not what you might expect. It would be nice … Continue reading

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SSH Trusted CA Key

It is now possible in openssh to authentic using trusted certificate authority keys. You can sign a key using a CA key. On the server side the CA key resides. Any key signed by the CA key will be authenticated. … Continue reading

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FTDI USB to Serial Linux Driver

If you are like me you work with the FTDI brand of USB to serial converter chips frequently. These chips are incredibly useful and thus are utilized in many different products. I recently had the situation where I had a … Continue reading

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Using Qemu to Create a PowerPC Emulator

The title of this entry is wrong but I couldn’t think of a better or more accurate one. This is really a simple post about setting up qemu to launch install Debian (ppc). It turns out to be really simple. … Continue reading

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Posix ACL Example

I ran into a situation where I wanted to have one user account to have access to a number of other accounts.  The situation is for web hosting.  On the server I administer we have domain accounts and user accounts.  … Continue reading

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Filter Out Disabled Windows Accounts

If you use pam_ldap to authenticate against Active Directory you may have a problem you never thought of. You may be allowing disabled accounts access to your system. Use the following filter to exclude disabled accounts. The filter looks at … Continue reading

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