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# 1  
Old 10-19-2009
changing line on a file

Hi, I want to change on a file this line:

vif = [ 'ip=,mac=00:16:3E:CE:23:14' ]


vif = [ 'ip=,mac=00:16:3E:CE:23:14,vifname=veth216','ip=,mac=00:16:3E:FD:58:BB,vifnam e=veth216a']

But there are some conditionals:

1. last part '] of the original line after 00:16:3E:CE:23:14' ] may vary to 00:16:3E:CE:23:14' ] or 00:16:3E:CE:23:14 ' ]
2. The second mac adrress of the line I need, 00:16:3E:FD:58:BB, must be different every time I run sed. Maybe just changing the last two characters BB to other two characters.
3. The [ ' and ' ] of both lines could be separated by some espaces, example [ ' or [' or ' ] or '] so you should not take this characters as a reference.
4. The Ip 167.xx.xx.xx and first mac address 00:16:3E:CE:23:14 are the same in two line. The second ip always is, and the second mac address must change every time I run sed command. Smilie

thanks tons
# 2  
Old 10-20-2009
what have you tried till now??
# 3  
Old 10-21-2009
Sorry, but I'm still with the problem... As the source file change, I mean the position of ' ] or [ ', so I'm not able to change to the output I want. I've tried a couple of sed commands.

# 4  
Old 10-21-2009
Hi Israel, would this work for you?
rndhex() {
  echo "ibase=10;obase=16; $((RANDOM%256))"|bc

while read line; do
  case $line in
    vif*)   mac=${line##*mac=}
            echo "${line%\' ]},vifname=veth216','ip=,mac=$newmac,vifname=veth216a' ]" ;;
    *)      echo $line ;;

$> cat infile
vif = [ 'ip=,mac=00:16:3E:CE:23:14' ]

$> ./test
vif = [ 'ip=,mac=00:16:3E:CE:23:14,vifname=veth216','ip=,mac=00:16:3E:E8:3B:8E,vifname=veth216a' ]
$> ./test
vif = [ 'ip=,mac=00:16:3E:CE:23:14,vifname=veth216','ip=,mac=00:16:3E:F3:46:99,vifname=veth216a' ]
$> ./test
vif = [ 'ip=,mac=00:16:3E:CE:23:14,vifname=veth216','ip=,mac=00:16:3E:FE:51:A3,vifname=veth216a' ]

Last edited by Scrutinizer; 10-21-2009 at 03:28 AM..
# 5  
Old 10-22-2009
Hi Scrutinizer,

The script works perfectly :-)
Thanks tons


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IEEE 802.3 is a working group and a collection of Institute of Electrical and Electronics Engineers (IEEE) standards produced by the working group defining the physical layer and data link layer's media access control (MAC) of wireless Ethernet.
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