Under Linux, fork() only makes a copy of the page tables and a new task structure, exec() will do the grunt work of "separating" the memory of the two processes. If the exec is called following fork (and this is what happens mostly), that causes a write to the process space and it is then copied for the child process, before modifications are ...

Jun 22, 2024 · To understand exec you need to first understand fork. I am trying to keep it short. When you come to a fork in the road you generally have two options. Linux programs reach this fork in the road when they hit a fork() system call. Normal programs are system commands that exist in a compiled form on your system.

The exec built-in command mirrors functions in the kernel, there are a family of them based on execve, which is usually called from C. exec replaces the current program in the current process, without forking a new process. It is not something you would use in every script you write, but it comes in handy on occasion.

Sep 5, 2018 · exec is to run a command in the same process as the shell. That's the last command a script will execute because after that, the process will be running another command than the shell. So if your script is #! /bin/sh - exec "$@" And you call your script using a shell command line like: /path/to/your-script 'echo' "some test" 'x y'

Jun 6, 2018 · Using -execdir. There is also -execdir (implemented by most find variants, but not a standard option).. This works like -exec with the difference that the given shell command is executed with the directory of the found pathname as its current working directory and that {} will contain the basename of the found pathname without its path (but GNU find will still prefix the basename with ...

Apr 18, 2019 · Description The exec() family of functions replaces the current process image with a new process image. The functions described in this manual page are front-ends for execve(2). (See the manual page for execve(2) for further details about the replacement of the current process image.)

Ask questions, find answers and collaborate at work with Stack Overflow for Teams. Try Teams for free Explore Teams

Oct 29, 2020 · Here I don't understand what the following piece of code is trying to achieve, I did search online for the use of exec but don't quite get the idea, could anyone please help to explain? Code snippet: exec $(dirname "$0")/init.sh -l interface.mod -l instrument.mod -a postinit.mod -a async.mod "$@"

Jun 28, 2013 · And the cool thing if you want to search in the current directory, you don't have to specify the path, just use dot (.) find . -name NAME.EXT -exec cp -rfp {} /DST_DIR \; – Laith Leo Alobaidy Commented Jul 11, 2015 at 5:00

Apr 18, 2015 · Instead, use the exec family of commands. These start the command directly, without starting a shell. You may still need to sanitize the input, but only to limit what may be passed to the command itself. Example from the SEI CERT C Coding Standard: