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The traditional Unix system does not have the functionality to create a new process running a new executable program in one step, which explains the importance of exec for Unix programming. Other systems may use spawn as the main tool for running executables. Its result is equivalent to the fork–exec sequence of Unix-like
REXX scripts for CMS share the filetype EXEC with EXEC and EXEC2, and the first line of the script specifies the interpreter to be used. REXX scripts for MVS may [a] be recognized by the low level qualifier EXEC or may [b] be recognized by context and the first line. REXX scripts for OS/2 share the filename extension .cmd with other scripting ...
When the child process calls exec(), all data in the original program is lost, and it is replaced with a running copy of the new program. This is known as overlaying . Although all data are replaced, the file descriptors that were open in the parent are closed only if the program has explicitly marked them close-on-exec .
Expect is used to automate control of interactive applications such as Telnet, FTP, passwd, fsck, rlogin, tip, SSH, and others. [3] Expect uses pseudo terminals (Unix) or emulates a console (Windows), starts the target program, and then communicates with it, just as a human would, via the terminal or console interface. [4]
The Plan 9 operating system, created by the designers of Unix, includes fork but also a variant called "rfork" that permits fine-grained sharing of resources between parent and child processes, including the address space (except for a stack segment, which is unique to each process), environment variables and the filesystem namespace; [15] this ...
An ELF file has two views: the program header shows the segments used at run time, whereas the section header lists the set of sections.. In computing, the Executable and Linkable Format [2] (ELF, formerly named Extensible Linking Format) is a common standard file format for executable files, object code, shared libraries, and core dumps.
Make is widely used, especially in Unix and Unix-like operating systems, even though many competing technologies and tools are available including: similar tools that perform actions based on dependencies, some compilers and interactively via an integrated development environment.
SystemTap debuted in 2005 in Red Hat Enterprise Linux 4 Update 2 as a technology preview. [2]After four years in development, SystemTap 1.0 was released in 2009. [3]As of 2011, SystemTap runs fully supported in all Linux distributions including RHEL / CentOS 5 [4] since update 2, SLES 10, [5] Fedora, Debian and Ubuntu.