Have you ever written a bash script that requires arguments passed from a file content rather than the command line? If so, you’re in luck! With just a few lines of code, you can easily retrieve and use those arguments in your script.
The Unix shell, also known as the command-line interface or CLI, is a powerful tool that allows users to manipulate files, directories, and other system resources. Bash, the most common Unix shell, provides a rich set of built-in commands and functions that make it an ideal choice for automation and scripting tasks.
One of the challenges of writing a bash script is handling command-line arguments. While it’s easy to pass arguments directly on the command line, it’s not always convenient or practical. Sometimes, the arguments are too long, contain special characters, or need to be generated dynamically. In these cases, it’s better to read them from a file.
To read arguments from a file in bash, you can use the readarray command, which reads lines from a file into an array variable. Here’s an example:
#!/bin/bash
readarray -t args <<< "$(cat arguments.txt)" # read lines from file into array
echo "Arguments:"
for arg in "$args[@]"; do # loop over array
echo "- $arg"
done
In this script, arguments.txt is the file that contains the arguments, with each argument on a separate line. The readarray command reads the lines into the args array variable. The -t option removes the trailing newline character from each line. The <<< notation is a here-string that allows a string to be passed as input to a command.
The script then loops over the args array and prints each argument preceded by a dash. You can modify this script to suit your needs, such as passing the arguments to another command or processing them in some other way.
In conclusion, reading arguments from a file in bash is a simple and powerful technique that can save you time and effort when writing scripts. With the readarray command, you can easily retrieve and use arguments from a file, either for testing or production purposes. Try it out and see how it can simplify your scripting tasks!
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