Snippet Collections

This code iterates over all arguments passed to a script using the `"$@"` builtin variable, which represents all positional parameters, and prints each argument. This demonstrates how to handle and process command-line arguments in a Bash script.

This code prints the number of arguments passed to the script using the built-in variable `$#`. This demonstrates how to access the count of arguments in a Bash script.

This code defines a function `my_function` that prints the name of the current function using the built-in variable `${FUNCNAME[0]}`. It demonstrates how to access the name of the currently executing function in Bash.

Print the current Bash version using the built-in variable `$BASH_VERSION`. This demonstrates accessing and displaying the version of the Bash shell.

Print the current line number in the script using the built-in variable `$LINENO`. This demonstrates how to access and use the line number variable in Bash.

This code prints the hostname of the current system using the built-in variable `$HOSTNAME`.

Print the current working directory using the `$PWD` built-in variable.

This snippet calculates the elapsed time of a script by using the `SECONDS` built-in variable. It simulates some work with `sleep 2`, then computes the difference between the current `SECONDS` value and the initial `start_time`. This demonstrates how to measure script execution time using Bash's built-in variables.

Print a random number using the built-in `$RANDOM` variable in Bash. This demonstrates the use of Bash's built-in variables to generate random numbers.

Set a variable `VAR` to `value` and execute command with the variable set. This demonstrates how to temporarily set an environment variable for a single command without affecting the current shell environment.

Print the literal string `$variable` using single quotes, which prevent variable expansion. This demonstrates how single quotes preserve the exact text within them.

Print the PID of the current shell process using the built-in variable `$$`. This demonstrates accessing the process ID of the current shell session.

This code uses a regular expression to extract an email address from a string. It checks if the string contains a valid email pattern and prints the matched email if found. This demonstrates regex-based pattern matching and extraction in Bash.

This code uses the `printf` command to print formatted output, displaying the name "Alice" and age 30 in a structured way. This demonstrates how to format and display variables in a specific layout.

Run a `sleep` command in the background for 5 seconds, wait for it to complete using `wait`, and then print "Background process completed". This demonstrates how to wait for background processes to finish before proceeding.

This script sets up a trap to catch the `SIGINT` signal (triggered by pressing `Ctrl+C`), prints a message, and exits the script when interrupted. It demonstrates how to handle interruptions gracefully in a Bash script.

This code demonstrates the use of the `shift` command in Bash, which shifts positional parameters to the left. Initially, it prints the first argument (`$1`), then shifts the arguments, and prints the new first argument. This shows how `shift` can be used to manipulate positional parameters.

This code assigns the string `echo 'Hello, World!'` to the variable `command` and then uses `eval` to execute the string as a Bash command. This demonstrates how to evaluate a string as code in Bash.

Create a file `my_script.sh` containing a command to print "Hello, World!", then source the file to execute its contents. This demonstrates how to include and execute commands from another script using `source` or `.`.

List the contents of the current directory using the `ls` command. This demonstrates how to view files and directories in the current working directory.