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redirect output to a file name

 
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Old 06-16-2008
It's not clear how you are invoking the shell from C, or vice versa. If you want to capture the output from a shell command in C, the customary way to do that is with popen()
 
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LEARN ABOUT MOJAVE

tc-mirred

Mirror/redirect action in tc(8)                                        Linux                                       Mirror/redirect action in tc(8)

NAME

       mirred - mirror/redirect action

SYNOPSIS

       tc ... action mirred DIRECTION ACTION [ index INDEX ] dev DEVICENAME

       DIRECTION := { ingress | egress }

       ACTION := { mirror | redirect }

DESCRIPTION

       The  mirred  action  allows  packet  mirroring  (copying)  or redirecting (stealing) the packet it receives. Mirroring is what is sometimes
       referred to as Switch Port Analyzer (SPAN) and is commonly used to analyze and/or debug flows.

OPTIONS

       ingress
       egress Specify the direction in which the packet shall appear on the destination interface.

       mirror
       redirect
              Define whether the packet should be copied (mirror) or moved (redirect) to the destination interface.

       index INDEX
              Assign a unique ID to this action instead of letting the kernel choose one automatically.  INDEX is a 32bit unsigned integer greater
              than zero.

       dev DEVICENAME
              Specify the network interface to redirect or mirror to.

EXAMPLES

       Limit ingress bandwidth on eth0 to 1mbit/s, redirect exceeding traffic to lo for debugging purposes:

              # tc qdisc add dev eth0 handle ffff: ingress
              # tc filter add dev eth0 parent ffff: u32 
                   match u32 0 0 
                   action police rate 1mbit burst 100k conform-exceed pipe 
                   action mirred egress redirect dev lo

       Mirror all incoming ICMP packets on eth0 to a dummy interface for examination with e.g. tcpdump:

              # ip link add dummy0 type dummy
              # ip link set dummy0 up
              # tc qdisc add dev eth0 handle ffff: ingress
              # tc filter add dev eth0 parent ffff: protocol ip 
                   u32 match ip protocol 1 0xff 
                   action mirred egress mirror dev dummy0

       Using an ifb interface, it is possible to send ingress traffic through an instance of sfq:

              # modprobe ifb
              # ip link set ifb0 up
              # tc qdisc add dev ifb0 root sfq
              # tc qdisc add dev eth0 handle ffff: ingress
              # tc filter add dev eth0 parent ffff: u32 
                   match u32 0 0 
                   action mirred egress redirect dev ifb0

SEE ALSO

       tc(8), tc-u32(8)

iproute2                                                            11 Jan 2015                                    Mirror/redirect action in tc(8)