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What is the difference between “Rollback…” and “Back Out Submitted Changelist #####” in Perforce P4V
...to reverse the changes from one of my checkins. In the right-click context menu of the particular changelist, there are these two options:
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How to search and replace globally, starting from the cursor position and wrapping around the end of
...,$s/BEFORE/AFTER/gc
Then, that :substitute command is repeated with the same search
pattern, replacement string, and flags, using the :& command
(see :help :&):
1,''-&&
The latter, however, performs the substitution on the range of lines
from the first line of the file to the line...
TCP vs UDP on video stream
I just came home from my exam in network-programming, and one of the question they asked us was "If you are going to stream video, would you use TCP or UDP? Give an explanation for both stored video and live video-streams" . To this question they simply expected a short answer of TCP for stored vid...
How to find all serial devices (ttyS, ttyUSB, ..) on Linux without opening them?
...Which gives you descriptions of all TTY devices known to the system. A trimmed down example:
# ll /sys/class/tty/ttyUSB*
lrwxrwxrwx 1 root root 0 2012-03-28 20:43 /sys/class/tty/ttyUSB0 -> ../../devices/pci0000:00/0000:00:1d.0/usb2/2-1/2-1.4/2-1.4:1.0/ttyUSB0/tty/ttyUSB0/
lrwxrwxrwx 1 root root ...
How does the MapReduce sort algorithm work?
...rstanding the basics of the sorting algorithm used in the MapReduce environment.
4 Answers
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What is the easiest way to disable/enable buttons and links (jQuery + Bootstrap)
Sometimes I use anchors styled as buttons and sometimes I just use buttons. I want to disable specific clicky-things so that:
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How do DATETIME values work in SQLite?
I’m creating Android apps and need to save date/time of the creation record. The SQLite docs say, however, "SQLite does not have a storage class set aside for storing dates and/or times" and it's "capable of storing dates and times as TEXT, REAL, or INTEGER values".
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What's an Aggregate Root?
...- from a caller's perspective it automatically loads them, either at the same time the root is loaded or when they're actually needed (as with lazy loading).
For example, you might have an Order object which encapsulates operations on multiple LineItem objects. Your client code would never load the...
How do you get the footer to stay at the bottom of a Web page?
...r's height */
}
.footer, .push {
height: 142px; /* .push must be the same height as .footer */
}
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Why do you need to create a cursor when querying a sqlite database?
...ule (and SQL in general for that matter), and this just completely stumps me. The abundant lack of descriptions of cursor objects (rather, their necessity) also seems odd.
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