Passing argument to command in C Post: 302558796

Sponsored Content

Top Forums Programming Passing argument to command in C Post 302558796 by effizy on Sunday 25th of September 2011 11:35:15 AM

09-25-2011

Registered User

Passing argument to command in C

Hello all,

New to C and I'm trying to write a program which can run a unix command. Would like to have the option of giving the user the ability to enter arguments e.g for "ls" be able to run "ls -l".

I would appreciate any help.

Thanks

Code:

#include <stdio.h>
#include <unistd.h>
#include <string.h>
#include <sys/types.h>

main()
{
   int menuchoice;
int execv(const char* path, char* const argv[]);

   do
 {
   
      printf("  Select an action to perform:\n");
      printf("  1. This will execute the sleep command\n");
      printf("  2. This will execute the ps command\n");
      printf("  0. This will exit the script\n");
    
                
     scanf("%d", &menuchoice);
      switch (menuchoice)
        { 
         case 1:
               if (fork())
                  wait(0);
                else
        char* args[] = {"sleep","30","60","90", (char* ) NULL};
          printf("Please enter any of the following sleep time\n");
            printf("30,60,90\n");
        execv("sleep", args);
                       break;
          case 2:
               if (fork())
                  wait(0);
               else
                  system("ps -ef", "ps -ef", (char *)NULL);
                  break;
          case 0:
        printf("Goodbye\n");
return 0;
               break;
          default:
               printf("Please enter only 0-6\n");

   }
  }

   while (menuchoice != 0);
}

effizy

View Public Profile for effizy

Find all posts by effizy

10 More Discussions You Might Find Interesting

1. Shell Programming and Scripting

Passing the command line argument in a variable

Hi, I am new to unix. Is their a way to pass the output of the line below to a variable var1. ls -1t | head -1. I am trying something like var1=ls -1t | head -1, but I get error. Situation is: I get file everyday through FTP in my unix box. I have to write a script that picks up first...

2. Shell Programming and Scripting

passing a command line argument

I have a shell script which does the encryption of a file where i am passing the file name as a command line argument,but later on the script waits on the screen to enter Y or N what is the command i should be using on the shell script #!/bin/bash -x outfilename=file.out echo...

3. Shell Programming and Scripting

passing argument from Cshelll to awk command

Hi all I have got a file digits.data containing the following data 1 3 4 2 4 9 7 3 1 7 3 10 I am writing a script that will pass an argument from C-shell to nawk command. But it seems the values in the nawk comman does not get set. the program does not print no values out. Here is the...

4. Shell Programming and Scripting

Need Help with the argument passing Through Command line

$$$$$

5. UNIX for Dummies Questions & Answers

Passing command line argument between shell's

Hi, I am facing a problem to pass command line arguments that looks like <script name> aa bb "cc" dd "ee" I want to pass all 5 elements include the " (brackets). when I print the @ARGV the " disappear. I hope I explain myself Regards, Ziv

6. UNIX for Dummies Questions & Answers

Passing command output as an argument to a shell script

Hi, I have a very small requirement where i need to pass command output as an argument while invoking the shell script.. I need to call like this sh testscript.sh ' ls -t Appl*and*abc* | head -n 1' This will list one file name as ana argument.. I will be using "$1" in the shell...

7. Shell Programming and Scripting

Passing argument on find command

Hi, I'm trying to pass the variable in the find command like below a=log.20111114 find /apps/file3_logs/env3/ -name '$a' -exec ls -lrt {} \; but it's not working thanks in advance. Regards Thelak

8. Shell Programming and Scripting

Passing an argument to cut command

Can we pass an argument to cut command as below Suppose cut command is used in for or while loop and we need to pass the incremental counter cut -f$i Here $i is an argument. Like wise it has to come cut -f1 cut -f2 Where i=1,2,3,....

9. Shell Programming and Scripting

Passing an argument using alias to piped command

Hi. I'm trying to do a "simple" thing. grep -rls grepped_exp path | xgs where xgs is an alias to something like: xargs gvim -o -c ":g/grepped_exp" now the problem is that I want to pass the "grepped_exp" to the piped alias. I was able to do something like what I want without the...

10. UNIX for Beginners Questions & Answers

Creating file and passing argument to a command

Hi All, I am having command to run which will take argument as input file. Right now we are creating the input file by cat and executing the command ftptransfer -i input file cat >input file file1 file2 cntrl +d Is there a way I can do that in a single command like ...

LEARN ABOUT MOJAVE

dxprintf_exec

XPRINTF_EXEC(3) 					   BSD Library Functions Manual 					   XPRINTF_EXEC(3)

NAME

     asxprintf_exec, dxprintf_exec, fxprintf_exec, sxprintf_exec, xprintf_exec, vasxprintf_exec, vdxprintf_exec, vfxprintf_exec, vsxprintf_exec,
     vxprintf_exec -- execute-only extensible printf execution

SYNOPSIS

     #include <printf.h>

     int
     asxprintf_exec(char ** restrict ret, printf_comp_t restrict pc, ...);

     int
     dxprintf_exec(int fd, printf_comp_t restrict pc, ...);

     int
     fxprintf_exec(FILE * restrict stream, printf_comp_t restrict pc, ...);

     int
     sxprintf_exec(char * restrict str, size_t size, printf_comp_t restrict pc, ...);

     int
     xprintf_exec(printf_comp_t restrict pc, ...);

     #include <stdarg.h>

     int
     vasxprintf_exec(char ** restrict ret, printf_comp_t restrict pc, va_list ap);

     int
     vdxprintf_exec(int fd, printf_comp_t restrict pc, va_list ap);

     int
     vfxprintf_exec(FILE * restrict stream, printf_comp_t restrict pc, va_list ap);

     int
     vsxprintf_exec(char * restrict str, size_t size, printf_comp_t restrict pc, va_list ap);

     int
     vxprintf_exec(printf_comp_t restrict pc, va_list ap);

DESCRIPTION

     These functions are execute-only, extensible printf (see xprintf(5)) variants, taking a printf_comp_t structure created by the format string
     compilation routine new_printf_comp(3).  All these variants behave like their normal printf counterparts (see printf(3)) without 'x' and
     ``_exec'' in the name (except sxprintf_exec() and vsxprintf_exec() behave like snprintf() and vsnprintf(), respectively).

SEE ALSO

     printf(3), xprintf_comp(3), xprintf(5)

Darwin								   Aug 19, 2012 							    Darwin

10 More Discussions You Might Find Interesting

1. Shell Programming and Scripting

Passing the command line argument in a variable

Discussion started by: rkumar28

2. Shell Programming and Scripting

passing a command line argument

Discussion started by: rudoraj

3. Shell Programming and Scripting

passing argument from Cshelll to awk command

Discussion started by: ganiel24

4. Shell Programming and Scripting

Need Help with the argument passing Through Command line

Discussion started by: asirohi