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Shell script to read file into variable

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# 1  
Old 03-19-2008
Shell script to read file into variable
the script i am trying to write will allow my server to give itself an ip address.

So far i am up to the following but i'm stuck.

tracert -m 1 > traceroute.txt

[Outputs]
1 routername (ipaddr) 2.094 ms 1.789 ms 1.243 ms

i want to get ipaddr as a variable and use it to write the ifcfg-eth script.
How should i go about this?
# 2  
Old 03-19-2008
Code:
# one way that does not use an intermediate  file
tracert -m 1 | read one two ipaddr dummy
# from the file
awk '{ print $3}' traceroute.txt | read ipaddr
# if you want to lose the ( ) around the ipaddr if you really have one
awk '{ print $3}' traceroute.txt | tr -d '('  | tr -d ')'  | read ipaddr

# 3  
Old 03-19-2008
i am using this in the script
traceroute -m1 ipaddr |grep 10.12 |awk '{ print $3}'| tr -d '(' | tr -d ')' | read ipaddr

echo $ipaddr

the only problem now is that it wont run as a single command.

ipaddr=$ ( traceroute -m1 10.0.100.1 |grep 10.12 |awk '{ print $3}'| tr -d '(' | tr -d ')' )
tracert.sh: line 3: syntax error near unexpected token `|'
tracert.sh: line 3: `ipaddr=( traceroute -m 1 10.100.0.100 |grep 10.12 |awk '{print $3}'| tr -d '(' | tr -d ')' )'
# 4  
Old 03-19-2008
so i got the command to work on a single line, syntax error.

What i want to do now is trim the last three digits of the ip..

I have 192.168.1.1 i'm trying to achieve 192.168.1
# 5  
Old 03-19-2008
Code:
$ echo "192.168.1.1" | sed 's/\([0-9]*\)\(\.[0-9]*\)\(\.[0-9]*\)\(\.[0-9]*\)/\1\2\3/'
192.168.1
$

# 6  
Old 03-19-2008
Code:
 # echo "192.168.1.1" | awk -F'.' ' {IP=""; for(i=1;i<NF;i++) { IP=IP $i "." } print IP}'
192.168.1.

# 7  
Old 03-19-2008
Quote:
Originally Posted by aspect_p
What i want to do now is trim the last three digits of the ip..

I have 192.168.1.1 i'm trying to achieve 192.168.1

Do you want to remove the last two or the last three characters? You say three, but your example only has two removed.
Code:
ipaddr=192.168.1.1
printf "%s\n" "${ipaddr%??}"
printf "%s\n" "${ipaddr%???}"

On the other hand, if you want the last component of the dotted quad address removed:
Code:
ipaddr=192.168.1.1
printf "%s\n" "${ipaddr%.*}"
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