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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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STRCPY(3)						     Linux Programmer's Manual							 STRCPY(3)

NAME
strcpy, strncpy - copy a string SYNOPSIS
#include <string.h> char *strcpy(char *dest, const char *src); char *strncpy(char *dest, const char *src, size_t n); DESCRIPTION
The strcpy() function copies the string pointed to by src (including the terminating `' character) to the array pointed to by dest. The strings may not overlap, and the destination string dest must be large enough to receive the copy. The strncpy() function is similar, except that not more than n bytes of src are copied. Thus, if there is no null byte among the first n bytes of src, the result will not be null-terminated. In the case where the length of src is less than that of n, the remainder of dest will be padded with nulls. RETURN VALUE
The strcpy() and strncpy() functions return a pointer to the destination string dest. BUGS
If the destination string of a strcpy() is not large enough (that is, if the programmer was stupid/lazy, and failed to check the size before copying) then anything might happen. Overflowing fixed length strings is a favourite cracker technique. CONFORMING TO
SVID 3, POSIX, BSD 4.3, ISO 9899 SEE ALSO
bcopy(3), memccpy(3), memcpy(3), memmove(3) GNU
1993-04-11 STRCPY(3)
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