getrlimit(3p), setregid(3p), setegid(3p), (This is POSIX.1-2008 with the 2013 Technical Corrigendum 1 applied.) Provided by: manpages-posix_2.16-1_all NAME exec - execute commands and open, close, or copy file descriptors SYNOPSIS exec [command [argument...]] DESCRIPTION The exec utility shall open, close, and/or copy file descriptors as specified by any redirections as part of the command. Example 1: Example 2: If command is supplied, it replaces the shell without creating a new process. setgid(3p),
sighold(3p), getenv(3p), .source
Linux man-pages project. by Michael Kerrisk, ulimit(3p), -l Place a dash at the beginning of the zeroth arg passed to command. wait(3p), aio_return(3p), optopt(3p), putenv(3p), (adsbygoogle = window.adsbygoogle || []).push({}). builtin - Run a shell builtin. In order to use this feature, you must load the
The original Standard can be obtained online at http://www.unix.org/online.html . maintainer of the Run a bash script
readdir_r(3p), To run an executable file or a shell script from the command line it is often not necessary to use exec at all, just prefix the filename with ./
chroot - Run a command with a different root directory. posix_trace_eventid_equal(3p), If arguments are specified, they shall be arguments to command. system(3p), Execute a command in a container Synopsis. opterr(3p),
nohup - Run a command immune to hangups. mmap(3p), mknodat(3p), aio_write(3p), HTML rendering created 2020-09-19 getppid(3p), fstatvfs(3p), execve(2), a system call directly to the kernel, usually just called exec; To wait for a child process to finish: wait(2), a system call directly to the kernel; To run a program in a shell in a child process and wait for it to finish: system(3), a library function; To get the man pages for all of the above: $ man 2 fork execve wait $ man 3 system fort77(1p), sigaction(3p),
In the event of any discrepancy between this version and the original IEEE and The Open Group Standard, the original IEEE and The Open Group Standard is the referee document. bash will only search the path not the current working directory for the file. fcntl(3p), confstr(3p), setlocale(3p),
This manual page is part of the POSIX Programmer's Manual. exit - Exit the shell. Open readfile as file descriptor 3 for reading: Most historical implementations were not conformant in that: Portions of this text are reprinted and reproduced in electronic form from IEEE Std 1003.1, 2013 Edition, Standard for Information Technology -- Portable Operating System Interface (POSIX), The Open Group Base Specifications Issue 7, Copyright (C) 2013 by the Institute of Electrical and Electronics Engineers, Inc and The Open Group. Equivalent Windows command: START /
atexit(3p), sigignore(3p), semop(3p), Syntax exec [-cl] [-a name] [command [arguments]] Options -c Causes command to be executed with an empty environment.
If command is not found, the exit status shall be 127. The standard error shall be used only for diagnostic messages. optind(3p),
to $PATH but this is widely considered to be bad practice for security reasons. The exec() family of functions creates a new process image from a regular, executable file. Please see the example stdarg.c. If exec is specified without command or arguments, and any file descriptors with numbers greater than 2 are opened with associated redirection statements, it is unspecified whether those file descriptors remain open when the shell invokes another utility. wordfree(3p). watch - Execute/display a program periodically. open(3p), posix_typed_mem_open(3p), Execute a command. c99(1p), You might be tempted to 'fix' this by adding '.' signal(3p), >_ exec -a [process_name] [command -with -flags], Replace with the specified command using the current environment variables, Replace with the specified command, clearing environment variables, Replace with the specified command and login using the default shell, Replace with the specified command and change the process name. su - Run a command with substitute user and group id. posix_trace_eventid_get_name(3p), To report such errors, see https://www.kernel.org/doc/man-pages/reporting_bugs.html . shmat(3p), awk(1p), aio_read(3p), close(3p), Redirection affects the current shell execution environment. If command is supplied, it replaces the shell without creating a new process. The exec() family of functions replaces the current process image with a new process image. crontab - Schedule a command to run at a later time. type - Describe a command. wordexp(3p),
exit(3p), Default. The exec command can be used in two modes: Exec with a command as an argument: In the first mode, the exec tries to execute it as a command passing the remaining arguments, if any, to that command and managing the redirections, if any. environ(3p), To execute a program/script in the current working directory use: ./file_name
command(1p), that I teach, look here. posix_trace_event(3p), If no command is specified, redirections can be used to affect the current shell environment. getpgid(3p), waitid(3p), setenv(3p), lio_listio(3p),
setpgrp(3p), getitimer(3p), posix_spawn(3p), globfree(3p),
- Run commands from a file. A better plan is putting all shell scripts into a folder and adding that one folder to your $PATH, This is a BASH shell builtin, to display your local syntax from the bash prompt type: help [e]xec, "In art the hand can never execute anything higher than the heart can inspire" ~ Ralph Waldo Emerson. sigaltstack(3p), For details of in-depth kubectl-exec - Man Page. The functions described in this manual page are front-ends for execve(2) .
readdir(3p), posix_trace_create_withlog(3p), If exec is specified without command or arguments, and any file descriptors with numbers greater than 2 are opened with associated redirection statements, it is unspecified whether those file descriptors remain open when the shell invokes another utility. (See the manual page for execve(2) for further details about the replacement of the current process image.) shm_open(3p), If command is found, but it is not an executable utility, the exit status shall be 126. Any typographical or formatting errors that appear in this page are most likely to have been introduced during the conversion of the source files to man page format. The exec utility shall open, close, and/or copy file descriptors as specified by any redirections as part of the command. Thefollowingsectionsareinformative. getsid(3p), pthread_atfork(3p), EXEC(1P) POSIX Programmer's Manual EXEC(1P), IEEE/The Open Group 2013 EXEC(1P), https://www.kernel.org/doc/man-pages/reporting_bugs.html. fork(3p), sigpending(3p), This file is either an executable object file, or an interpreter script. nice(3p), Execute a command in a container. setuid(3p), Linux/UNIX system programming training courses stdarg.h(0p), If command is specified, exec shall not return to the shell; rather, the exit status of the process shall be the exit status of the program implementing command, which overlaid the shell. fcntl.h(0p), Scripts concerned that child shells could misuse open file descriptors can always close them explicitly, as shown in one of the following examples. If exec is specified with command, it shall replace the shell with command without creating a new process. posix_trace_create(3p), if - Conditionally perform a command. setpgid(3p), The Linux Programming Interface, times(3p), mknod(3p),
aio_error(3p), newgrp(1p), The exec utility shall open, close, and/or copy file descriptors as specified by any redirections as part of the command. sigset(3p), alarm(3p), getpgrp(3p),
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