Makefile get output from shell command. How to get variables from the command line while makefile is runing? Ask Question Asked 12 years, 2 months ago Modified 3 years, 3 months ago Jul 9, 2014 · RETURN_CODE := $(shell $(COMMAND); echo $$?) How can I do both simultaneously, i. We’ll cover basic methods, step-by-step examples, advanced techniques, edge cases, and best practices to ensure you can confidently use environment variables in your projects. Sep 10, 2020 · Running this command in the command line or in a make recipe gives the desired output. The shell function provides for make the same facility that backquotes (‘ ` ’) provide in most shells: it does command expansion. Furthermore your assignment sets a shell variable but your indication of it references a Makefile variable. Dec 16, 2025 · In this guide, we’ll demystify how to access shell environment variables in a Makefile. Jul 23, 2025 · The make command for Linux is a very useful utility in the automation of software development and performing tasks in a Linux environment. 8 on MacOS (i386-apple-darwin11. Right now I'm able to grab the basename of the fi. For each example, put the contents in a file called Makefile, and in that directory run the command make. Feb 22, 2022 · When asking for help it’s best to include the command you typed, and then the output you got (if it’s a lot of output at least show the errors and few lines before it), and explain what you wanted. This runs no matter which target I specify (including clean, which is the downside, but ultimately not a huge deal to me). With GNU Make, you can use shell and eval to store, run, and assign output from arbitrary command line invocations. sh is the path (same directory as the makefile) and name of my script to run. Finally, as a general rule (not really applicable to this example): as esperanto notes in comments, using the output from ls is not completely reliable (some details depend on file names and sometimes even the version of ls; some versions of ls attempt to sanitize output in some cases). May 2, 2016 · My command get the dependencies of a file passed in parameter and now, I want use it like dependencies into Makefile. sh) which tells make to simply run a shell command. I do somethink like : $ (shell) is a special function in gmake that runs an external command and captures the output for use in the makefile. The simpler command I could reproduce is awsecrpush: VAR=$$( sudo echo "ls -lah" ) Mar 23, 2010 · $(shell . It simply reads a special file, which is called a Makefile and this file describes how one's program is compiled and linked with another file or another program action. Nov 30, 2025 · In this blog, we’ll demystify why `ls` output causes issues in Makefiles, explore common pitfalls, and provide step-by-step solutions to fix these errors. Configuration spans multiple components: the PSP-side modules (psplink. execute the command once, store the output, but also check the return code? EDIT Duplicate here although his solution is not pleasant: Makefile: Output and Exitcode to variable? Jul 22, 2019 · I have a command that spits as an output another command. prx), the PC-side daemon (usbhostfs_pc), the interactive shell (pspsh), and build-time options. 0) I'm trying to generate a bunch of test files based on the files in a directory. However, I can't get it to work so that I can capture the results of the Powershell command within the Makefile to a variable. Jun 18, 2025 · This isn't possible because each command (line) is run in isolation. e. For example, you could get the current working directory like this: Oct 8, 2013 · Locally I'm usin GNU Make 3. This means that it takes as an argument a shell command and expands to the output of the command. Let's start with the simplest of Makefiles: hello: echo "Hello, World" Note: Makefiles must be indented using TABs and not spaces or make will fail. The difference between the example below and those which use := is the := assignment happens once (when it is encountered) and for all. /genVer. I'd like to run this output in a makefile script. prx, usbhostfs. For information about usage and commands, see Shell Command Apr 5, 2012 · echo * as your shell command. Whether you’re a seasoned developer or new to Makefiles, you’ll learn best practices for using shell commands safely and effectively. 3. . Here is the output of running the above example: $ make echo "Hello, World" Hello, World 3 days ago · Configuration and Customization Relevant source files This page documents the configuration options and customization settings available in PSPLINK. cyxi hynydqv rys ogxoc lfe rppdrj ycph tpdni ravvp llice