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How can I extract a predetermined range of lines from a text file on Unix?
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sed -n '16224,16482p;16483q' filename > newfile
From the sed manual:
p -
Print out the pattern space (to the standard output). This command is usually only used in conjunction with the -n command-line option.
n -
If auto-print is not disabled, print t...
How is malloc() implemented internally? [duplicate]
...c really gives memory segments back to the kernel with that method). Aside from that, there's also mmap which is used to map files into memory but is also used to allocate memory (if you need to allocate shared memory, mmap is how you do it).
So you have two methods of getting more memory from the ...
Why does “pip install” inside Python raise a SyntaxError?
I'm trying to use pip to install a package. I try to run pip install from the Python shell, but I get a SyntaxError . Why do I get this error? How do I use pip to install the package?
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How do you Force Garbage Collection from the Shell?
...rm program.
Fire it up like so:
java -jar jmxterm-1.0-alpha-4-uber.jar
From there, you can connect to a host and trigger GC:
$>open host:jmxport
#Connection to host:jmxport is opened
$>bean java.lang:type=Memory
#bean is set to java.lang:type=Memory
$>run gc
#calling operation gc of mb...
Virtual member call in a constructor
I'm getting a warning from ReSharper about a call to a virtual member from my objects constructor.
18 Answers
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What does threadsafe mean?
Recently I tried to Access a textbox from a thread (other than the UI thread) and an exception was thrown. It said something about the "code not being thread safe" and so I ended up writing a delegate (sample from MSDN helped) and calling it instead.
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Can I export a variable to the environment from a bash script without sourcing it?
... variable:
. ./export.bash
or
source ./export.bash
Now when echoing from main shell it works
echo $VAR
HELLO, VARABLE
We will now reset VAR
export VAR=""
echo $VAR
Now we will execute a script to source the variable then unset it :
./test-export.sh
HELLO, VARABLE
--
.
the code: cat...
How do I prevent the padding property from changing width or height in CSS?
... in your newdiv with width: auto and margin-left: 20px
Remove the padding from newdiv.
The W3 Box model page has good info.
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How to get URI from an asset File?
...asset/... (note: three slashes) where the ellipsis is the path of the file from within the assets/ folder.
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Sending an HTTP POST request on iOS
...he push never reaches the server although I do get a code 200 as response (from the urlconnection). I never get a response from the server nor does the server detect my posts (the server does detect posts coming from android)
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