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1 liner question

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# 1  
Old 03-09-2009
1 liner question
This works:

nslookup `uname -n`|tail -2|awk -F: '{print $2}'

This does not

aa=`nslookup `uname -n`|tail -2|awk -F: '{print $2}'`


Why???

Solaris v10

Thanks
Brandt
# 2  
Old 03-09-2009
Some shells have a problem with backtics inside backtics use : $( ) instead.
# 3  
Old 03-09-2009
Because you need to escape the inner backticks:

Code:
aa=`nslookup \`uname -n\`|tail -2|awk -F: '{print $2}'`

I believe there is a better way to extract the above information though ...
# 4  
Old 03-09-2009
What would be the better way? Please & Thanks!!
# 5  
Old 03-09-2009
Radoulov,

Your backticks worked well, I will use that!!

Thanks All!!
# 6  
Old 03-09-2009
If your shell supportsthe $() syntax for process substitution:
Code:
addr="$(perl -MSocket -e'
  print inet_ntoa(~~gethostbyname$ENV{"HOSTNAME"})
  ')"

Or:

Code:
addr="$(nslookup "$HOSTNAME"|nawk '/^Add/&&c++{print $NF}')"


Or:

Code:
addr="$(getent hosts "$HOSTNAME"|cut -f1)"

Last edited by radoulov; 03-09-2009 at 01:14 PM..
# 7  
Old 03-09-2009
All works!!

Again Thanks!!

Brandt
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