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What does the “@” symbol do in Powershell?
... a hash table with key-value pairs, e.g.
$HashArguments = @{ Path = "test.txt"; Destination = "test2.txt"; WhatIf = $true }
Splatting (see about_splatting)
Let's you invoke a cmdlet with parameters from an array or a hash-table rather than the more customary individually enumerated parameters, e....
How to generate an openSSL key using a passphrase from the command line?
...ssions, and specify that:
openssl genrsa -aes128 -passout file:passphrase.txt 3072
Or supply the passphrase on standard input:
openssl genrsa -aes128 -passout stdin 3072
You can also used a named pipe with the file: option, or a file descriptor.
To then obtain the matching public key, you n...
BLE（四）嗅探工具 - 创客硬件开发 - 清泛IT社区，为创新赋能！
...，可以直接从github：https://github.com/greatscottgadgets/ubertooth下载到最新的发布版。
优点：
售价约120美元，比较亲民本身是一个开源的硬件和软件工程，其设计目的就是用来进行蓝牙网络的嗅探，便于研究员和黑客使用针对不同...
Set cache-control for entire S3 bucket automatically (using bucket policies?)
... Here are a some examples.
For a single file
aws s3 cp s3://mybucket/file.txt s3://mybucket/file.txt --metadata-directive REPLACE \
--expires 2034-01-01T00:00:00Z --acl public-read --cache-control max-age=2592000,public
For an entire bucket (note --recursive flag):
aws s3 cp s3://mybucket/ s3://my...
Batch file to delete files older than N days
...* /d:%1 /L /I null') do if exist %%~nxa echo %%~nxa >> FILES_TO_KEEP.TXT
for /f "tokens=*" %%a IN ('xcopy *.* /L /I /EXCLUDE:FILES_TO_KEEP.TXT null') do if exist "%%~nxa" del "%%~nxa"
This deletes files older than a given date. I'm sure it can be modified to go back seven days from the curre...
How to force file download with PHP
... "gif" => "image/gif",
"pdf" => "application/pdf",
"txt" => "text/plain",
"html"=> "text/html",
"png" => "image/png",
"jpeg"=> "image/jpg"
);
if($mime_type==''){
$file_extension = strtolower(substr(strrchr($file,"."),1));
...
Checkout one file from Subversion
...
svn cat svn://.../my_file.txtwas exactly what I was looking for. I work in an svn:// only (no http://) repository, and it looks the newest websvn interfaces doesn't provide a raw file download (or we have it mis-configured or I am blind). Easier to do...
Resolve absolute path from relative path and/or file name
...
@KurtPfeifle d:\foo\..\bar\xyz.txt can still be normalized. I recommend using this approach with @axel-heider's answer below (using a batch subroutine -- then you can do it on any variable, not just a numbered variable).
– BrainSlugs...
How do I move a single folder from one Subversion repository to another repository?
...svn log URL_to_docs | awk '/^r/{gsub(/^r/,"",$1);print $1}' > revisions.txt
#tac for revisions in reverse (oldest revision first)
tac revisions.txt | while read line; do svnadmin dump /svn/old_repo -r$line >> ./docs_revisions.dump ; done
#You don't have to filter if you commited only files...
How to deal with persistent storage (e.g. databases) in Docker
...DATA2 -v $(pwd):/backup busybox tar xvf /backup/backup.tar
data/
data/sven.txt
# Compare to the original container
$ sudo docker run --rm --volumes-from DATA -v `pwd`:/backup busybox ls /data
sven.txt
Here is a nice article from the excellent Brian Goff explaining why it is good to use the same im...