Help me please for covert shell script to c.

[slackman]

i'm writing shell script in this below.but i want to programing with c on linux that working same shell script.

#!/bin/sh
####shellscript example####

function chat_block(){
/usr/local/bin/naxclassv1 access echo > /etc/squid/squid.conf
/usr/local/bin/naxclassv1 access cat /usr/local/bin/chat_template/$1 > /etc/squid/squid.conf
}
function check_mac_dup(){
/usr/local/bin/naxclassv1 access cat /usr/local/bin/nax_temp/$1 | grep -w $2 | cut --delimiter=' ' -f 1
}
}
function firewall_safe(){
IPT="/usr/local/bin/naxclassv1 access iptables"

$IPT -F
$IPT -Z
$IPT -X
$IPT -t mangle -F
$IPT -t mangle -Z
$IPT -t mangle -X
$IPT -t nat -F
$IPT -t nat -Z
$IPT -t nat -X

$IPT -A POSTROUTING -s 0.0.0.0/0.0.0.0 -o eth0 -j MASQUERADE -t nat
$IPT -A PREROUTING -s 0.0.0.0/0.0.0.0 -i eth1 -p tcp -m tcp --dport 80 -j REDIRECT --to-ports 3128 -t nat
$IPT -A FORWARD -m state --state ESTABLISHED,RELATED -j ACCEPT
$IPT -A FORWARD -i eth1 -j ACCEPT
}

for arg in "$@"
do
# parse $arg
case $arg
in
# match each option with $arg if a match is found proccess the list
"chat_block") chat_block $2;; 
"check_mac_dup") check_mac_dup $2 $3;;
"firewall_safe") firewall_safe;;
esac
done

**i try to use "execl" function in c programing.but not working because i use "|" include in command line. please to help me i want to teach my student in classroom!!.(i don't want to use "shc" command for convert it!!)

[bigtomrodney]

Post moved to the programming/scripting section.

[Franklin52]

Try to use the popen() function.
Google for examples of popen.

Regards