Show me the steps to solve You will need to implement the following functions:

void exec$\_$cmd$\_$red$\_$out$($char $*$args$[],$ char $*$filename$)$

$1.$ Create a child process using fork.

$2.$ The child process should do the following:

$($a$)$ Close standard output.

$($b$)$ Create a new file with the name given by filename.

$($c$)$ If the file can not be created, display an error and exit the child process.

$($d$)$ Execute the command.

$($e$)$ If the execution fails, display an error and exit the child process.

$3.$ The parent process should wait for the child process to complete.

void exec$\_$cmd$\_$red$\_$in$($char $*$args$[],$ char $*$filename$)$

$1.$ Create a child process using fork.

$2.$ The child process should do the following:

$($a$)$ Close standard input.

$($b$)$ Open a file for reading only with the name given by filename.

$($c$)$ If the file can not be opened, display an error and exit the child process.

$($d$)$ Execute the command.

$($e$)$ If the execution fails, display an error and exit the child process.

$3.$ The parent process should wait for the child process to complete.

void exec$\_$cmd$\_$pipe$($char $*$args$1[],$ char $*$args$2[])$

$1.$ Create a child process using fork.

$2.$ The child process should do the following:

$($a$)$ Create a pipe.

$($b$)$ If the pipe creation fails, diplsay an error and exit the child process.

$($c$)$ Create a second child process.

$($d$)$ The second child process should redirect standard output to write to the pipe

input, execute the command, and display an error and exit if execution fails.

$($e$)$ The first child process should redirect standard input to read from the pipe

output, execute the command, and display an error and exit if execution fails.

$3.$ The parent process should wait for the first child process to complete.