system - Executes a shell command
Standard C Library (libc.so, libc.a)
const char *string);
Interfaces documented on this reference page conform to industry standards as follows:
system(): XPG4, XPG4-UNIX
Refer to the standards(5) reference page for more information about industry standards and associated tags.
Specifies a valid sh shell command.
The system() function passes the string parameter to the sh command, which interprets string as a command and executes it.
The system() function invokes the fork() function to create a child process that in turn uses the exec function to run sh, which interprets the shell command contained in the string parameter. The current process waits until the shell has completed before returning.
If the string parameter is NULL, the system() function returns 0 if it is unable to access the command interpreter or a non-zero value if sh is accessible.
If the string parameter is not NULL, upon successful completion by sh, the system() function returns the exit status of the shell process in the form that wait(2) returns. Otherwise, the system() function returns a value of -1 and sets errno to indicate the error.
Exit status 127 indicates that the shell could not be executed.
Note that the exit status should only be interpreted using the macros described in wait(2) and defined in the sys/wait.h header file.
The system() function sets errno to the specified values for the following conditions: The status of the child process created by system() is no longer available.
In addition, the system() function may set errno values as described by fork().
Functions: exec(2), exit(2), fork(2), wait(2)
Standards: standards(5) delim off