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Test if a variable is set in bash when using “set -o nounset”
...(x86_64-redhat-linux-gnu)
$ set -o nounset
If you want a non-interactive script to print an error and exit if a variable is null or not set:
$ [[ "${HOME:?}" ]]
$ [[ "${IAMUNBOUND:?}" ]]
bash: IAMUNBOUND: parameter null or not set
$ IAMNULL=""
$ [[ "${IAMNULL:?}" ]]
bash: IAMNULL: parameter nul...
Using a .php file to generate a MySQL dump
... I would choose the second one, which doesn't return the output to the PHP script -- no need for the PHP script to get the whole SQL dump as a string : you only need it written to a file, and this can be done by the command itself.
That external command will :
be a call to mysqldump, with the ri...
How can I tell if one commit is a descendant of another commit?
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If you want to check this programmatically (e.g. in script), you can check if git merge-base A B is equal to git rev-parse --verify A (then A is reachable from B), or if it is git rev-parse --verify B (then B is reachable from A). git rev-parse is here needed to convert from ...
Unicode character as bullet for list-item in CSS
...n use conditional comments to apply older/slower solutions like images, or scripts. Better yet, use both with <noscript> for the images.
HTML:
<!--[if lt IE 8]>
*SCRIPT SOLUTION*
<noscript>
*IMAGE SOLUTION*
</noscript>
<![endif]-->
About backgr...
I want to delete all bin and obj folders to force all projects to rebuild everything
... thread and got bingo. A little more searching turned up this power shell script:
Get-ChildItem .\ -include bin,obj -Recurse | ForEach-Object ($_) { Remove-Item $_.FullName -Force -Recurse }
I thought I'd share, considering that I did not find the answer when I was looking here.
...
Git pre-push hooks
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Git got the pre-push hook in the 1.8.2 release.
Sample pre-push script: https://github.com/git/git/blob/87c86dd14abe8db7d00b0df5661ef8cf147a72a3/templates/hooks--pre-push.sample
1.8.2 release notes talking about the new pre-push hook: https://github.com/git/git/blob/master/Documentation/...
What's the difference between “Write-Host”, “Write-Output”, or “[console]::WriteLine”?
...othing, meaning that you can't redirect the output, e.g., to a file.
---- script a.ps1 ----
write-host "hello"
Now run in PowerShell:
PS> .\a.ps1 > someFile.txt
hello
PS> type someFile.txt
PS>
As seen, you can't redirect them into a file. This maybe surprising for someone who are n...
Is it ok to use dashes in Python files when trying to import them?
...t to prevent imports. For example in (say) a Django project, you may have scripts written in Python that should not be addressable as applications. You can put these in a folder like ops-scripts and know they can't be imported using a normal package namespace approach. Or a single script could be...
Dynamically generating a QR code with PHP [closed]
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qrcode-generator on Github. Simplest script and works like charm.
Pros:
No third party dependency
No limitations for the number of QR code
generations
share
|
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Constantly print Subprocess output while process is running
To launch programs from my Python-scripts, I'm using the following method:
13 Answers
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