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Why do we use xargs?
It converts input from standard input into arguments to a command. Some commands such as grep and awk can take input either as command-line arguments or from the standard input. However, others such as cp and echo can only take input as arguments, which is why xargs is necessary.
What is the purpose of xargs?
Build and execute command lines from standard input
xargs/Function
Why is Xargs used?
xargs (short for “eXtended ARGuments”) is a command on Unix and most Unix-like operating systems used to build and execute commands from standard input. It converts input from standard input into arguments to a command.
Why do I use$ ARG instead of% in xargs?
The use of “$arg” instead of % (and the absence of -I in the xargs command line) is for security reasons: Passing data on sh ‘s command-line argument list instead of substituting it into code prevents content that data might contain (such as $ (rm -rf ~), to take a particularly malicious example) from being executed as code.
How to run multiple commands with xargs Stack Overflow?
In the example above, xargs takes echo % as the command argument. But in some cases, I need multiple commands to process the argument instead of one. For example: cat a.txt | xargs -I % {command1; command2;
Why does printf pass two values to xargs?
The two values that xargs parses out of the input are passed to this “script”. The shell then assigns those values to $1 and $2 , which you can then reference in the “script”. because printf has an intrinsic xargs -like ability to execute multiple times if it is given more arguments than it needs for a single invocation.
How is the output of xargs written to the terminal?
The output is written to the terminal window, as one long stream of text. It’s this capability that let’s xargs feed parameters into other commands. We can use xargs to easily have wc count the words, characters, and lines in multiple files. ls lists the *.page files and passes the list to xargs.