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Shell Programming and Scripting

invoke unix variable in SED command

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# 1  
Old 05-11-2010
invoke unix variable in SED command
Hi,

I am trying tio invoke unix variable in a sed command like below, but it seems to be failing..

Code:
a=1
sed -n '$a,$p' file.txt    ### Failing

but

Code:
a=1
sed -n '1,$p' files.txt    ### Works fine


Please help me to fix this... Thanks in advance
# 2  
Old 05-11-2010
Try...
Code:
a=1
sed -n "$a,$ p" file.txt

# 3  
Old 05-11-2010
Thatz working!! Thanks a lot for your help!!
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