popen is used to read and write to a unix pipe.
This function is NOT included in 'C Programming Language' (ANSI) but can be found in 'The Standard C Library' book.
Library: stdio.h
Prototype: FILE *popen(const char *command, const char *type);
Syntax: FILE *fp;
fp = popen( "ls -l", "r");
Notes:
command - is the command to be issued.
type - r - read O/P from command.
- w - Write data as I/P to command.
example program.
fp=popen("ls -l 2>&1", "w");
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