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“unary operator expected” error in Bash if condition
...the variable expansion and the variable is undefined or empty, it vanishes from the scene of the crime, leaving only
if [ = "and" ];
which is not a valid syntax. (It would also fail with a different error message if $aug1 included white space or shell metacharacters.)
The modern [[ operator has...
How to execute multi-line statements within Python's own debugger (PDB)
...eems the same can be achieved using the pdb interact command (as I learned from this bug tracker message).
– gerrit
Jun 11 '14 at 15:15
3
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Why are these constructs using pre and post-increment undefined behavior?
...he hyper-modernist philosophy had gotten. What irks me is the progression from "We don't need to officially recognize this behavior because the platforms where it's needed can support it anyway" to "We can remove this behavior without providing a usable replacement because it was never recognized a...
Why is a 3-way merge advantageous over a 2-way merge?
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This slide from a perforce presentation is interesting:
The essential logic of a three-way merge tool is simple:
Compare base, source, and target files
Identify the "chunks" in the source and target files file:
C...
What is the purpose of the '@' symbol in CSS?
...how styles are applied.
Some code examples:
/* Import another stylesheet from within a stylesheet */
@import url(style2.css);
/* Apply this style only for printing */
@media print {
body {
color: #000;
background: #fff;
}
}
/* Embed a custom web font */
@font-face {
f...
What does GitHub for Windows' “sync” do?
... git pull --rebase and then if there are local changes, it does git push.
From here: http://haacked.com/archive/2012/05/21/introducing-github-for-windows.aspx#87318
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How to color the Git console?
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As noted by @VonC, color.ui defaults to auto since Git 1.8.4
From the Unix & Linux Stackexchange question How to colorize output of git? and the answer by @Evgeny:
git config --global color.ui auto
The color.ui is a meta configuration that includes all the various color.* con...
Android - get children inside a View?
...vary based on how vertical/horizontal the view hierarchy is.
Cross-posted from: Android | Get all children elements of a ViewGroup
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Is the C# static constructor thread safe?
...ception, forgetting to call Release), next time this Singleton is accessed from a different thread it will deadlock in Singleton.Acquire().
– Milan Gardian
Jun 25 '09 at 13:16
2
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Android Closing Activity Programmatically
What is the equivalent operation within an activity to navigating away from the screen. Like when you press the back button, the activity goes out of view. How can this be called from inside an activity so that it closes itself.
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