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How do I pause my shell script for a second before continuing?
...leep 5d # Waits 5 days.
One can also employ decimals when specifying a time unit; e.g. sleep 1.5s
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How to get the unique ID of an object which overrides hashCode()?
...t as an integer. Uniqueness isn't necessarily guaranteed. The Sun JVM implementation will give you a value which is related to the original memory address for this object, but that's an implementation detail and you shouldn't rely on it.
EDIT: Answer modified following Tom's comment below re. memor...
Altering a column: null to not null
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Let me value-add to the above two correct responses. The semantics of NULL can have a few meanings. One of the common meaning is UNKNOWN. Take SCORE as an example. A null SCORE and a ZERO SCORE is a world of difference! Before yo...
Qt: can't find -lGL error
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You should install package "libgl1-mesa-dev":
sudo apt install libgl1-mesa-dev
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Install a Windows service using a Windows command prompt?
...lutil.exe in your .net folder (for .net 4 it's C:\Windows\Microsoft.NET\Framework\v4.0.30319 for example) and use it to install your service, like this:
"C:\Windows\Microsoft.NET\Framework\v4.0.30319\installutil.exe" "c:\myservice.exe"
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How to change the timeout on a .NET WebClient object
...ogramatically) and their webserver is very, very slow which is causing a timeout in my WebClient object.
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Replacing a fragment with another fragment inside activity group
I have a fragment inside a group activity and I want to replace it with another fragment:
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What is the command to truncate a SQL Server log file?
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if I remember well... in query analyzer or equivalent:
BACKUP LOG databasename WITH TRUNCATE_ONLY
DBCC SHRINKFILE ( databasename_Log, 1)
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How to get root access on Android emulator?
I have All Android SDK versions(from 1.5 to 2.3.3), and I tried many methods for getting root in Android emulator. I don't use any Android device and test everything on emulator(AVD).
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How can I reload .emacs after changing it?
...d-file (M-x load-file, then press return twice to accept the default filename, which is the current file being edited).
You can also just move the point to the end of any sexp and press C-xC-e to execute just that sexp. Usually it's not necessary to reload the whole file if you're just changing a l...