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What's a concise way to check that environment variables are set in a Unix shell script?
I've got a few Unix shell scripts where I need to check that certain environment variables are set before I start doing stuff, so I do this sort of thing:
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Is there a link to the “latest” jQuery library on Google APIs? [duplicate]
I use the following for a jQuery link in my <script> tags:
12 Answers
12
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How to find out what character key is pressed?
...hat character key is pressed in a cross-browser compatible way in pure Javascript.
8 Answers
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Difference between sh and bash
...ons. Many of these extensions may change the behavior of valid POSIX shell scripts, so by itself bash is not a valid POSIX shell. Rather, it is a dialect of the POSIX shell language.
bash supports a --posix switch, which makes it more POSIX-compliant. It also tries to mimic POSIX if invoked as sh.
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Create timestamp variable in bash script
I am trying to create a timestamp variable in a shell script to make the logging a little easier. I want to create the variable at the beginning of the script and have it print out the current time whenever I issue echo $timestamp . It proving to be more difficult then I thought. Here are some thin...
Using curl POST with variables defined in bash script functions
...d be quoted.
First, write a function that generates the post data of your script. This saves you from all sort of headaches concerning shell quoting and makes it easier to read an maintain the script than feeding the post data on curl's invocation line as in your attempt:
generate_post_data()
{
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How can I use swift in Terminal?
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In Xcode 6.1.1 with Command Line Tools installed you can execute scripts by referencing directly to /usr/bin/swift the following way:
#!/usr/bin/swift
let variable: String = "string"
print("Test \(variable)")
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Cron jobs and random times, within given hours
I need the ability to run a PHP script 20 times a day at completely random times. I also want it to run only between 9am - 11pm.
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What's the difference between UTF-8 and UTF-8 without BOM?
... It might not be recommended but it did wonders to my powershell script when trying to output "æøå"
– Marius
Nov 12 '13 at 9:22
63
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Multiprocessing - Pipe vs Queue
...gging hard unless you know some shortcuts. For instance, you might have a script that works fine when indexing through a dictionary in under many conditions, but infrequently fails with certain inputs.
Normally we get clues to the failure when the entire python process crashes; however, you don't ...