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Top Forums UNIX for Dummies Questions & Answers I am not able to use variables in system command in a C program Post 302760483 by RudiC on Thursday 24th of January 2013 05:43:04 AM
Old 01-24-2013
You should allocate a char variable, fill it with the string constant "whereis " (e.g. sprintf) and the contents of your user input variable (e.g. strcpy), and supply that to the system call.
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explain_sprintf_or_die(3)				     Library Functions Manual					 explain_sprintf_or_die(3)

NAME
explain_sprintf_or_die - formatted output conversion and report errors SYNOPSIS
#include <libexplain/sprintf.h> int explain_sprintf_or_die(char *data, const char *format, ...); int explain_sprintf_on_error(char *data, const char *format, ...); DESCRIPTION
The explain_sprintf_or_die function is used to call the sprintf(3) system call. On failure an explanation will be printed to stderr, obtained from the explain_sprintf(3) function, and then the process terminates by calling exit(EXIT_FAILURE). The explain_sprintf_on_error function is used to call the sprintf(3) system call. On failure an explanation will be printed to stderr, obtained from the explain_sprintf(3) function, but still returns to the caller. data The data, exactly as to be passed to the sprintf(3) system call. format The format, exactly as to be passed to the sprintf(3) system call. RETURN VALUE
The explain_sprintf_or_die function only returns on success, see sprintf(3) for more information. On failure, prints an explanation and exits, it does not return. The explain_sprintf_on_error function always returns the value return by the wrapped sprintf(3) system call. EXAMPLE
The explain_sprintf_or_die function is intended to be used in a fashion similar to the following example: int result = explain_sprintf_or_die(data, format, ...); SEE ALSO
sprintf(3) formatted output conversion explain_sprintf(3) explain sprintf(3) errors exit(2) terminate the calling process COPYRIGHT
libexplain version 0.52 Copyright (C) 2010 Peter Miller explain_sprintf_or_die(3)
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