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How can I delete a file from a Git repository?
I have added a file named "file1.txt" to a Git repository. After that, I committed it, added a couple of directories called dir1 and dir2 , and committed them to the Git repository.
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How do I use shell variables in an awk script?
...int var}' var="${variable}"
or
awk '{print var}' var="${variable}" file
Adding multiple variables:
awk '{print a,b,$0}' a="$var1" b="$var2" file
In this way we can also set different Field Separator FS for each file.
awk 'some code' FS=',' file1.txt FS=';' file2.ext
Variable after the cod...
List of Delphi language features and version in which they were introduced/deprecated
...w language features
not new VCL/FMX features.
Here are the links to the RAD Studio docwiki:
What's new in Rad Studio 10.3 Rio
What's new in Delphi and C++Builder 10.2 Tokyo
What's new in Delphi and C++Builder 10.1 Berlin
What's new in Delphi and C++Builder 10 Seattle
What's new in Delphi an...
How to concatenate text from multiple rows into a single text string in SQL server?
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If you are on SQL Server 2017 or Azure, see Mathieu Renda answer.
I had a similar issue when I was trying to join two tables with one-to-many relationships. In SQL 2005 I found that XML PATH method can handle the concatenation of the rows very easily.
If there is a table called STUDENTS
Subj...
How to permanently export a variable in Linux?
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You can add it to your shell configuration file, e.g. $HOME/.bashrc or more globally in /etc/environment.
After adding these lines the changes won't reflect instantly in GUI based system's you have to exit the terminal or create a ne...
C# code to validate email address
What is the most elegant code to validate that a string is a valid email address?
43 Answers
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How do I disable right click on my web page?
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You can do that with JavaScript by adding an event listener for the "contextmenu" event and calling the preventDefault() method:
document.addEventListener('contextmenu', event => event.preventDefault());
That being said: DON'T DO IT.
Why? Because it ach...
How to do version numbers? [closed]
...].[minor].[release].[build]
major: Really a marketing decision. Are you ready to call the version 1.0? Does the company consider this a major version for which customers might have to pay more, or is it an update of the current major version which may be free? Less of an R&D decision and more a...
How do I cast a string to integer and have 0 in case of error in the cast with PostgreSQL?
...as just wrestling with a similar problem myself, but didn't want the overhead of a function. I came up with the following query:
SELECT myfield::integer FROM mytable WHERE myfield ~ E'^\\d+$';
Postgres shortcuts its conditionals, so you shouldn't get any non-integers hitting your ::integer cast. ...
Is it possible to perform a 'grep search' in all the branches of a Git project?
... the branches.
Another form would be:
git rev-list --all | (
while read revision; do
git grep -F 'yourWord' $revision
done
)
You can find even more example in this article:
I tried the above on one project large enough that git complained about the argument size, so if you ru...