Can anyone help with the below code. I am trying to execute Shell script with arguments in C program but it is giving errors.
One more thing - you call return system() in for(). return will terminate main() immediately so you won't have your script executed argc times. I'd suggest to save the return value of system in new variable and examine it if you need error checking.
hi,
I am new ot unix. So, can i write a shell(c shell or korn shell) program to access internet? I mean if I run the program, it can access specified url and then copy the html to a file? Can anyone help me? And how can make the program runs every 1 hr?
new comer (2 Replies)
Hi,
i want to write a script that executes a program (exec?) .
this program then requires a filename as input.
how do i give it this input in the script so the program will be complete run and close by the script.
e.g.
exec prog.exe
program then asks for filename
"enter filename:"... (1 Reply)
what i need is that after passwordless enter another program should execute. I can succeed passwordless login but ı could not execute (./son) program. pls help me (6 Replies)
i want use ssh on the host01 to execute autoexec.sh on the host02 like following :
host01> ssh host02 autoexec.sh
autoexec.sh include nohup command like follwing :
nohup /home/jack/deletedata.sh &
after i execute ssh host02 autoexec.sh one the host01. i can't found deletedata.sh... (1 Reply)
Output file template format
<input_file_name>a</input_file_name>
<total_length_size>b</total_length_size>
<log_10_length_size>c</log_10_length_size>
Input_file_1 (eg. sample.txt)
SDFSDGDGSFGRTREREYWW
Parameter:
a is equal to the input file name
b is equal to the total length of... (2 Replies)
Hi
I want to create a shell script tha executes a C program and then retrieves information about it.
I managed to run the program with:
#!/bin/bash
gcc -o program program.c
./program
Now i want to get the id of the process (pid)
Any help would be appreciated,
Thank you (18 Replies)
Hi All,
well , i am facing this problem.. i have tried a few sample codes but there isn't any solution . could anyone please give a sample code as of how to do this...
Please see the below details...and read the details carefully.
I have written some code, logic is
1)from... (4 Replies)
I just can't figure it out , so please just give me a pice of advise how to:
The existing Linux program foo2bar takes as its only argument the name of a single foo file and converts it to an appropriately-named bar file. Provide a script that when executed will run foo2bar against all foo... (4 Replies)
Hello,
I have a c program executable which I need to run inside a shell script.
But the c program runs in a subshell because of which all the actions done by the c program is not available to the current shell.
Is there any way to execute a C program binary executable in the current shell? (4 Replies)
Discussion started by: sachinverma
4 Replies
LEARN ABOUT MINIX
execl
EXECL(3) Library Functions Manual EXECL(3)NAME
execl, execv, execle, execlp, execvp, exec, environ - execute a file
SYNOPSIS
#include <unistd.h>
int execl(const char *name, const char *arg0, ..., (char *) NULL)
int execv(const char *name, char *const argv[])
int execle(const char *name, const char *arg0, ..., (char *) NULL, char *const envp[])
int execlp(const char *name, const char *arg0, ..., (char *) NULL)
int execvp(const char *name, char *const argv[])
extern char *const *environ;
DESCRIPTION
These routines provide various interfaces to the execve system call. Refer to execve(2) for a description of their properties; only brief
descriptions are provided here.
Exec in all its forms overlays the calling process with the named file, then transfers to the entry point of the core image of the file.
There can be no return from a successful exec; the calling core image is lost.
The name argument is a pointer to the name of the file to be executed. The pointers arg[0], arg[1] ... address null-terminated strings.
Conventionally arg[0] is the name of the file.
Two interfaces are available. execl is useful when a known file with known arguments is being called; the arguments to execl are the char-
acter strings constituting the file and the arguments; the first argument is conventionally the same as the file name (or its last compo-
nent). A null pointer argument must end the argument list. (Note that the execl* functions are variable argument functions. This means
that the type of the arguments beyond arg0 is not checked. So the null pointer requires an explicit cast to type (char *) if not of that
type already.)
The execv version is useful when the number of arguments is unknown in advance; the arguments to execv are the name of the file to be exe-
cuted and a vector of strings containing the arguments. The last argument string must be followed by a null pointer.
When a C program is executed, it is called as follows:
int main(int argc, char *const argv[], char *const envp[]);
exit(main(argc, argv, envp));
where argc is the argument count and argv is an array of character pointers to the arguments themselves. As indicated, argc is convention-
ally at least one and the first member of the array points to a string containing the name of the file.
Argv is directly usable in another execv because argv[argc] is 0.
Envp is a pointer to an array of strings that constitute the environment of the process. Each string consists of a name, an "=", and a
null-terminated value. The array of pointers is terminated by a null pointer. The shell sh(1) passes an environment entry for each global
shell variable defined when the program is called. See environ(7) for some conventionally used names. The C run-time start-off routine
places a copy of envp in the global cell environ, which is used by execv and execl to pass the environment to any subprograms executed by
the current program.
Execlp and execvp are called with the same arguments as execl and execv, but duplicate the shell's actions in searching for an executable
file in a list of directories. The directory list is obtained from the environment variable PATH. Under standard Minix, if a file is
found that is executable, but does not have the proper executable header then it is assumed to be a shell script. Execlp and execvp exe-
cute /bin/sh to interpret the script. Under Minix-vmd this does not happen, a script must begin with #! and the full path name of the
interpreter if it is to be an executable script.
SEE ALSO execve(2), fork(2), environ(7), sh(1).
DIAGNOSTICS
If the file cannot be found, if it is not executable, if it does not start with a valid magic number (see a.out(5)), if maximum memory is
exceeded, or if the arguments require too much space, a return constitutes the diagnostic; the return value is -1 and errno is set as for
execve. Even for the super-user, at least one of the execute-permission bits must be set for a file to be executed.
4.2 Berkeley Distribution April 25, 1986 EXECL(3)