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Thanks.

As u mentioned, it depends on arch., comp,... B'se I am also getting diff. o/p on Linux m/c.

Actually, my environment is : Sun OS 5.8 on Sun SPARC arch.

My observation is as follows(...

Please go through the following two versions of code :-

Version 1 --- string1 and string2 declared as Global variables
The output is :-- (as expected sprintf is overwriting the first byte of...

In the export DISPLAY statement, try by giving IP address like

export DISPLAY=169.168.74.74:0

Why it is eating the first character of string2 only, if string2 is reserved first 12 bytes or whatever and string1 next 6 bytes

The order of declaration is:
char string2[12];
...

In my previous reply I mentioned the reason for displaying twice i.e. buffering stdin is on by default, this you can do off

by either setbuf(stdin,NULL) or fflush(stdin)

Even I...

standard input is getting buffered.

To resolve , you should stop stdin buffering. Try the following
setbuf(stdin,NULL) after scanf statement.

Moreover, atoi expects a character...

For cp :- read and write system calls
For mv :- Only the file name in the directory entry will be updated and the pointer to i-node for the file contents remains unchanged.