How to pass the command line arguments to the shell script in c language?
hi,
I am new in the shell script, and c programming with linux. I am looking to pass the arguments in c program that should be executed by the shell script.
here the migrate is shell script taking agrument as "argv[i]" but not actual argument passed to the program.
can anybody help me for this..???
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Please use code tags
Last edited by jim mcnamara; 05-01-2012 at 09:24 AM..
I am trying to pass max as a sommand line argument when I call awk.
Made the modification in the BEGIN but it is not working
I'm getting an error as below:
awk: txsrx.awk:82: (FILENAME=jcd.tx FNR=4161) fatal: cannot open file `40' for reading (No such file or directory)
Somehow it... (2 Replies)
Does anybody know how to Accept a “userid” as a command line argument on a Unix Bourne Shell Script?
The output should be something like this:
User userid has a home directory of /path/directory
the default shell for this user is /path/shell (1 Reply)
Does anybody know how to Accept a “userid” as a command line argument on a Unix Bourne Shell Script?
The output should be something like this:
User userid has a home directory of /path/directory
the default shell for this user is /path/shell (1 Reply)
Does anybody know how to Accept a “userid” as a command line argument on a Unix Bourne Shell Script?
The output should be something like this:
User userid has a home directory of /path/directory
the default shell for this user is /path/shell (5 Replies)
Hi,
I am writting a script. i am not sure what i am trying to do is possible or not. thats why asking the best of the best.
the script i want to write will recieve as input parameters 2 different options.
as in
MODE 1
-- start_date / end_date (2 dates has 2 go at a time
MODE 2... (2 Replies)
Hello All,
i am known to the limitation of different shells while passing more than 9 command line arguments
i just tried the example below
i do see my current shell is tcsh
echo $SHELL
/bin/tcsh
so if i make my script executable and run it
output is
... (6 Replies)
Hi... can anyone please help me out in using the CASE and command line argument in shell script... i am bit new to shell scripting...below i have explained my proble with example...
say i have an executable file with name 'new1.sh' and there are 3 functions in it a(), b() and c()....and there... (5 Replies)
]I have a string like "/abc/cmind/def/pq/IC.2.4.6_main.64b/lnx86" and this string is given by user. But in this string instead of 64b user may passed 32 b an i need to parse this string and check wether its is 32b or 64 b and according to it i want to set appropriate flags.
How will i do this... (11 Replies)
#!/bin/awk -f
BEGIN {
FS=":";
}
{
if ( $7 == "" ) {
print $1 ": no password!";
}
}
I want to execute this program for a particular user to check for his password from the file /etc/passwd (as the input file) and the user details to be given... (1 Reply)
Hi all,
I am working on a project, in which I have to connect to Bluetooth low energy device. I am able to connect and do data transfer from command line. But I want to do from script
Here is my script
#!/bin/bash
#sudo hcitool -i hci0 lescan
sleep 1
sudo hcitool -i hci0 lecc --random... (8 Replies)
Discussion started by: nithin@embdes
8 Replies
LEARN ABOUT BSD
execv
EXECL(3) Library Functions Manual EXECL(3)NAME
execl, execv, execle, execlp, execvp, exec, execve, exect, environ - execute a file
SYNOPSIS
execl(name, arg0, arg1, ..., argn, 0)
char *name, *arg0, *arg1, ..., *argn;
execv(name, argv)
char *name, *argv[];
execle(name, arg0, arg1, ..., argn, 0, envp)
char *name, *arg0, *arg1, ..., *argn, *envp[];
exect(name, argv, envp)
char *name, *argv[], *envp[];
extern char **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 0 argument must end the argument list.
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 0 pointer.
The exect version is used when the executed file is to be manipulated with ptrace(2). The program is forced to single step a single
instruction giving the parent an opportunity to manipulate its state. On the VAX-11 this is done by setting the trace bit in the process
status longword. Exect is not available on the PDP-11.
When a C program is executed, it is called as follows:
main(argc, argv, envp)
int argc;
char **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.
FILES
/bin/sh shell, invoked if command file found by execlp or execvp
SEE ALSO execve(2), fork(2), environ(7), csh(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. Even for the super-
user, at least one of the execute-permission bits must be set for a file to be executed.
BUGS
If execvp is called to execute a file that turns out to be a shell command file, and if it is impossible to execute the shell, the values
of argv[0] and argv[-1] will be modified before return.
4.2 Berkeley Distribution August 4, 1987 EXECL(3)