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Renaming files in a folder to sequential numbers
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Putting together some great ideas from comments on this answer and others: ls -1prt | grep -v "/$" | cat -n | while read n f; do mv -n "${f}" "$(printf "%04d" $n).${f#*.}"; done Results: (1) sorted in order of modification, later files with later indexes;...
How to get a variable value if variable name is stored as string?
...evel of variable indirection. Bash uses the value of the
variable formed from the rest of parameter as the name of the
variable; this variable is then expanded and that value is used in the
rest of the substitution, rather than the value of parameter itself.
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Display image as grayscale using matplotlib
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The following code will load an image from a file image.png and will display it as grayscale.
import numpy as np
import matplotlib.pyplot as plt
from PIL import Image
fname = 'image.png'
image = Image.open(fname).convert("L")
arr = np.asarray(image)
plt.imshow(...
Do I need a content-type header for HTTP GET requests?
...ontent-Type" is part of the representation (i.e. payload) metadata. Quoted from
RFC 7231 section 3.1:
3.1. Representation Metadata
Representation header fields provide metadata about the
representation. When a message includes a payload body, the
representation header fields describe how to inter...
How many String objects will be created when using a plus sign?
...the latter decompiles assemblies into IL and can re-generate equivalent C# from that IL. There is also a built-in tool called ILDASM ( msdn.microsoft.com/en-us/library/f7dy01k1(v=vs.80).aspx ) Understanding IL is a tricky thing- see codebetter.com/raymondlewallen/2005/02/07/…
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Catching error codes in a shell pipe
...way).
In the original pipeline, it is feasible for 'c' to be reading data from 'b' before 'a' has finished - this is usually desirable (it gives multiple cores work to do, for example). If 'b' is a 'sort' phase, then this won't apply - 'b' has to see all its input before it can generate any of its...
nginx error connect to php5-fpm.sock failed (13: Permission denied)
... to change listen.mode to 0660 in /etc/php5/fpm/pool.d/www.conf.
Sample from www.conf:
; Set permissions for unix socket, if one is used. In Linux, read/write
; permissions must be set in order to allow connections from a web server. Many
; BSD-derived systems allow connections regardless of per...
GPU Emulator for CUDA programming without the hardware [closed]
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__global__ void helloWorld() {
printf("Hello world! I am %d (Warp %d) from %d.\n",
threadIdx.x, threadIdx.x / warpSize, blockIdx.x);
}
int main() {
int blocks, threads;
scanf("%d%d", &blocks, &threads);
helloWorld<<<blocks, threads>>>();
cudaDe...
How to change value of object which is inside an array using JavaScript or jQuery?
The code below comes from jQuery UI Autocomplete:
23 Answers
23
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How do I run a Node.js application as its own process?
... systemctl enable myapp.
See logs with journalctl -u myapp
This is taken from How we deploy node apps on Linux, 2018 edition, which also includes commands to generate an AWS/DigitalOcean/Azure CloudConfig to build Linux/node servers (including the .service file).
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