Posts (page 188)
-
5 min readTo modify printf with the last -10 command in bash, you can use the !! shortcut to access the previous command and then pipe the output to printf with the desired format. For example, you can use the following command to print the last -10 command in a specific format: !! | tail -10 | printf "%s\n" This will retrieve the last -10 command from the command history, extract only the last 10 lines using tail, and then print them using printf with the specified format.
-
4 min readYou can check for the latest available Python 3.x version from bash by using the command curl to make a request to the official Python website and grep to filter out the latest version number. You can use the following command:curl -s 'https://www.python.org/downloads/' | grep -o -E 'Python [0-9]+\.[0-9]+\.
-
4 min readIn Bash, you can check if an argument starts with "--" by using the built-in parameter expansion feature. You can access the value of each argument by referencing it as $1, $2, $3, and so on.
-
4 min readTo add decimal values in bash, you can use the bc command. This command allows you to perform calculations with decimal numbers. Here's a simple example of how you can add two decimal values in bash using the bc command:result=$(echo "3.14 + 2.5" | bc) echo $resultIn this example, the echo command is used to provide the calculation "3.14 + 2.5" to the bc command. The bc command then performs the addition and stores the result in the variable result.
-
5 min readTo get the value from a text file for a particular string in bash, you can use the grep command along with some text processing commands like awk or cut.Here's a simple example: value=$(grep "search_string" file.txt | awk '{print $2}') echo $value In this example, we are searching for the "search_string" in the file.txt and then using awk to extract the value associated with that string (assuming it's in the second column).
-
4 min readTo set grid layout gravity using Kotlin, you can use the GridLayout.LayoutParams class to specify the gravity for each cell in the grid layout. You can create a new instance of GridLayout.LayoutParams and set the gravity using the setGravity method with the desired Gravity constant as the parameter. For example, to set the gravity of a view in the grid layout to Gravity.CENTER, you can do the following: val params = GridLayout.LayoutParams() params.setGravity(Gravity.CENTER) view.
-
4 min readTo export D3.js visualizations to an image or PDF, you can use the html2canvas library in combination with jsPDF. First, use html2canvas to capture the HTML elements containing the D3.js visualization and convert them to a canvas element. Then, pass this canvas element to jsPDF to generate a PDF document or convert it to an image by using the toDataURL method. This approach allows you to save your D3.
-
6 min readParsing an input in bash involves utilizing various methods to extract, manipulate, and store relevant information from the user's input. This can be achieved using tools such as the read command to capture user input, string manipulation functions like grep, sed, or awk to extract specific parts of the input, and variables to store and utilize the parsed data. Regular expressions can also be employed to search for patterns within the input and extract relevant information.
-
5 min readTo add a photo to the Android built-in gallery in Kotlin, you can use the MediaStore API. You first need to create a ContentValues object and put the necessary information such as the image file path, date taken, and MIME type. Then you can use the content resolver to insert the image into the MediaStore.Images.Media content provider. Finally, you can broadcast a media scanner intent to notify the gallery of the new image.
-
7 min readTo create a histogram in D3.js, you will first need to load the D3 library in your HTML file. Next, you will need to define the dimensions of the SVG element that will contain your histogram. Then, you can create a histogram generator using the d3.histogram() function, which will transform your data into bins. After that, you can define scales for the x and y axes using d3.scaleLinear().
-
4 min readTo check if a number is outside a dynamic range in bash, you can use conditional statements and comparison operators. Firstly, you need to define the lower and upper bounds of the dynamic range. Then, you can use an if statement to check if the number is less than the lower bound or greater than the upper bound. If the number falls outside the range, you can display an appropriate message or take necessary actions. Remember to handle edge cases such as when the number is equal to the bounds.
-
4 min readTo exclude multiple spring profiles in Kotlin, you can use the spring.profiles.active property in your application.properties or application.yml file. By setting this property to a value that excludes the profiles you want to exclude, you can prevent those profiles from being activated when your application starts. For example, if you want to exclude two profiles named "dev" and "test", you can set spring.profiles.active to a value that excludes both of them, such as !dev,!test.