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How to find and return a duplicate value in array
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@Kalanamith you can get duplicated values using this a.select {|e| a.count(e) > 1}.uniq
– Naveed
Jul 12 '13 at 16:34
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gunicorn autoreload on source change
....js" --recursive --command='echo "${watch_src_path}" && kill -HUP `cat gunicorn.pid`' . &
python manage.py run_gunicorn 127.0.0.1:80 --pid=gunicorn.pid
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When to wrap quotes around a shell variable?
... @mklement0, indeed they are equivalent. These guidelines indicate that you should always type "ls" "/" instead of the more common ls /, and I take that as a major flaw in the guidelines.
– William Pursell
Jun 11 '17 at 19:39
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How to concatenate two MP4 files using FFmpeg?
I'm trying to concatenate two mp4 files using ffmpeg. I need this to be an automatic process hence why I chose ffmpeg. I'm converting the two files into .ts files and then concatenating them and then trying to encode that concated .ts file. The files are h264 and aac encoded and I'm hoping to kee...
What ports does RabbitMQ use?
...ected to localhost.
Escape character is '^]'.
Check your firewall:
sudo cat /etc/sysconfig/iptables
It should tell you what ports are made open:
-A INPUT -p tcp -m tcp --dport 5672 -j ACCEPT
Reapply your firewall:
sudo service iptables restart
iptables: Setting chains to policy ACCEPT: fi...
Error: could not find function … in R
... which package it is contained.
find and getAnywhere can also be used to locate functions.
If you have no clue about the package, you can use findFn in the sos package as explained in this answer.
RSiteSearch("some.function") or searching with rdocumentation or rseek are alternative ways to find the...
Script parameters in Bash
...f:t: specifies that you're expecting 2 parameters that contain values (indicated by the colon). Something like f:t:v says that -v will only be interpreted as a flag.
opts is where the current parameter is stored. The case statement is where you will process this.
${OPTARG} contains the value follo...
Reading binary file and looping over each byte
...ats everything it is given:
#!/usr/bin/env python3
"""Discard all input. `cat > /dev/null` analog."""
import sys
from functools import partial
from collections import deque
chunksize = int(sys.argv[1]) if len(sys.argv) > 1 else (1 << 15)
deque(iter(partial(sys.stdin.detach().read, chun...
Git: Set up a fetch-only remote?
...lder of the same name in your working directory, git will not be able to locate. You are essentially forcing git to use a location that does not exist.
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Using awk to remove the Byte-order mark
...d a pain in the butt: they are an error! They break many things. Even just cat file1.utf8 file2.utf8 file3.utf3 > allfiles.utf8 will be broken. Never use a BOM on UTF-8. Period.
– tchrist
Mar 17 '12 at 18:51
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