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dead simple bash script question
Post 302256833 by graysky on Monday 10th of November 2008 04:42:21 PM
11-10-2008
dead simple bash script question
I need help writing a bash script that will simply prompt the user with a list of choices, then run an action based on the input. The action is running a wake-on-lan app called etherwake and passing a pre-defined mac address to the syntax.
I have defined the three MAC addresses as: MAC1, MAC2, MAC3. I'd like the script to do something like this:
The syntax of etherwake is:
sudo /usr/sbin/etherwake -i eth1 -b $MACNUMBER (where $MACNUMBER is predefined).
Any takers
Thanks!
I have defined the three MAC addresses as: MAC1, MAC2, MAC3. I'd like the script to do something like this:
Quote:
Which PC to wake?
1) PC1
2) PC2
3) PC3
4) Wake PC2, wait 40 sec, then wake PC3
Q) Quit and take no action
1) PC1
2) PC2
3) PC3
4) Wake PC2, wait 40 sec, then wake PC3
Q) Quit and take no action
sudo /usr/sbin/etherwake -i eth1 -b $MACNUMBER (where $MACNUMBER is predefined).
Any takers
Thanks!
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LEARN ABOUT OSX
tc-skbmod
skbmod action in tc(8) Linux skbmod action in tc(8) NAME
skbmod - user-friendly packet editor action SYNOPSIS
tc ... action skbmod { [ set SETTABLE ] [ swap SWAPPABLE ] [ CONTROL ] [ index INDEX ] } SETTABLE := [ dmac DMAC ] [ smac SMAC ] [ etype ETYPE ] SWAPPABLE := mac CONTROL := { reclassify | pipe | drop | shot | continue | pass } DESCRIPTION
The skbmod action is intended as a usability upgrade to the existing pedit action. Instead of having to manually edit 8-, 16-, or 32-bit chunks of an ethernet header, skbmod allows complete substitution of supported elements. OPTIONS
dmac DMAC Change the destination mac to the specified address. smac SMAC Change the source mac to the specified address. etype ETYPE Change the ethertype to the specified value. mac Used to swap mac addresses. The swap mac directive is performed after any outstanding D/SMAC changes. CONTROL The following keywords allow to control how the tree of qdisc, classes, filters and actions is further traversed after this action. reclassify Restart with the first filter in the current list. pipe Continue with the next action attached to the same filter. drop shot Drop the packet. continue Continue classification with the next filter in line. pass Finish classification process and return to calling qdisc for further packet processing. This is the default. EXAMPLES
To start, observe the following filter with a pedit action: tc filter add dev eth1 parent 1: protocol ip prio 10 u32 match ip protocol 1 0xff flowid 1:2 action pedit munge offset -14 u8 set 0x02 munge offset -13 u8 set 0x15 munge offset -12 u8 set 0x15 munge offset -11 u8 set 0x15 munge offset -10 u16 set 0x1515 pipe Using the skbmod action, this command can be simplified to: tc filter add dev eth1 parent 1: protocol ip prio 10 u32 match ip protocol 1 0xff flowid 1:2 action skbmod set dmac 02:15:15:15:15:15 pipe Complexity will increase if source mac and ethertype are also being edited as part of the action. If all three fields are to be changed with skbmod: tc filter add dev eth5 parent 1: protocol ip prio 10 u32 match ip protocol 1 0xff flowid 1:2 action skbmod set etype 0xBEEF set dmac 02:12:13:14:15:16 set smac 02:22:23:24:25:26 Finally, swap the destination and source mac addresses in the header: tc filter add dev eth3 parent 1: protocol ip prio 10 u32 match ip protocol 1 0xff flowid 1:2 action skbmod swap mac As mentioned above, the swap action will occur after any smac/dmac substitutions are executed, if they are present. SEE ALSO
tc(8), tc-u32(8), tc-pedit(8) iproute2 21 Sep 2016 skbmod action in tc(8)