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How can I check if a command exists in a shell script? [duplicate]
I am writing my first shell script. In my script I would like to check if a certain command exists, and if not, install the executable. How would I check if this command exists?
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How to check if a string is a valid JSON string in JavaScript without using Try/Catch
Something like:
22 Answers
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Changing every value in a hash in Ruby
I want to change every value in a hash so as to add '%' before and after the value so
11 Answers
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Git on Bitbucket: Always asked for password, even after uploading my public SSH key
I uploaded my ~/.ssh/id_rsa.pub to Bitbucket's SSH keys as explained , but Git still asks me for my password at every operation (such as git pull ). Did I miss something?
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Override valueof() and toString() in Java enum
The values in my enum are words that need to have spaces in them, but enums can't have spaces in their values so it's all bunched up. I want to override toString() to add these spaces where I tell it to.
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Heroku + node.js error (Web process failed to bind to $PORT within 60 seconds of launch)
I have my first node.js app (runs fine locally) - but I am unable to deploy it via heroku (first time w/ heroku as well). The code is below. SO doesn't let me write so much code, so I would just say that the running the code locally as well within my network shows no issue.
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Rolling back local and remote git repository by 1 commit
I've read the similar posts on this topic, and can't for the life of me figure out how to do this properly.
14 Answers
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JavaScript blob filename without link
How do you set the name of a blob file in JavaScript when force downloading it through window.location?
8 Answers
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Git hook to send email notification on repo changes
How do I configure the appropriate Git hook to send a summary email whenever a set of changes is pushed to the upstream repository?
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What is SuppressWarnings (“unchecked”) in Java?
Sometime when looking through code, I see many methods specify an annotation:
11 Answers
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