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How can I start an interactive console for Perl?
... so:
perl -de1
Alternatively there's Alexis Sukrieh's Perl Console application, but I haven't used it.
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How can I read command line parameters from an R script?
...d Apr 27 '15 at 13:10
The Unfun Cat
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answered Jan 28 '10 at 12:52
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Create a dictionary with list comprehension
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what if I have a case of list of words ['cat','dog','cat'] and I want to make a dict with key as word and value as count? Is there a short efficient syntax for that?
– cryanbhu
Jul 14 '19 at 2:30
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Upgrade python packages from requirements.txt using pip command
...grade
Advanced usage
If the requirements are placed in a non-standard location, send them as arguments:
pip-upgrade path/to/requirements.txt
If you already know what package you want to upgrade, simply send them as arguments:
pip-upgrade -p django -p celery -p dateutil
If you need to upgrad...
Delete multiple remote branches in git
...igin/ prefix) stored in a text file (one branch name per line), just run:
cat your_file.txt | xargs -I {} git push origin :{}
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Retrieve a single file from a repository
...git archive --remote=ssh://host/pathto/repo.git HEAD README.md
This will cat the contents of the file README.md.
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What is the difference between $(command) and `command` in shell programming?
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The backticks/gravemarks have been deprecated in favor of $() for command substitution because $() can easily nest within itself as in $(echo foo$(echo bar)). There are other differences such as how backslashes are parsed in the backtick/gravemark version, etc.
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Grep characters before and after match?
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grep -o -P ".{0,30}$1.{0,30}" "$2"
else
# Format was 'cat /path/to/filename | cgrep "search string"
grep -o -P ".{0,30}$1.{0,30}"
fi
} # cgrep()
Here's what it looks like in action:
$ ll /tmp/rick/scp.Mf7UdS/Mf7UdS.Source
-rw-r--r-- 1 rick rick 25780 Jul 3 19:05 /...
How do I pass an extra parameter to the callback function in Javascript .filter() method?
...g why their fat arrow function is ignoring [, thisArg], e.g. why
["DOG", "CAT", "DOG"].filter(animal => animal === this, "DOG")
returns []
it's because this inside those arrow functions are bound when the function is created and are set to the value of this in the broader encompassing scope, so...
How do I pull from a Git repository through an HTTP proxy?
...xy:
git config --global http.proxy http://proxy.mycompany:80
To authenticate with the proxy:
git config --global http.proxy http://mydomain\\myusername:mypassword@myproxyserver:8080/
(Credit goes to @EugeneKulabuhov and @JaimeReynoso for the authentication format.)
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