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inserting a variable to a new line

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# 1  
Old 06-07-2011
inserting a variable to a new line
In my script I am using sed to insert a line.

Suppose I have a variable called ck_size=5 and a temporary file called tmp

I want to add a certain line in the tmp file .Please see the below command

Code:
sed -i '2a\maitee is $ck_size'  /dun/homes/lrsprod/tmp


I want in 2 line of tmp file it should show maitree is 5.
Please help as the above command is not picking ck_size value. I am using tcsh shell.
# 2  
Old 06-07-2011
Code:
sed -i "2a\maitee is $ck_size"  infile

# 3  
Old 06-07-2011
it is not working
# 4  
Old 06-08-2011
Better use awk with -v for variable substitution.
Code:
awk -v var="$your_variable" 'action'

# 5  
Old 06-08-2011
What sed version your using..?(guess its GNU sed..however) Post output of sed --version. And it also depends where your variable $ck_size is defined. Is it any kind of env variable and you run the sed command in the commmand line or all these sed and variable $ck_size are defined inside a script file..? However try.
Code:
 sed -i ' 2a\mama is here '"$ck_size"' ' inputfile

# 6  
Old 06-08-2011
GNU sed version 4.1.5
Copyright (C) 2003 Free Software Foundation, Inc.
This is free software; see the source for copying conditions. There is NO
warranty; not even for MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE,
to the extent permitted by law.


ck_size is not env variable.could you please help me.

Image
# 7  
Old 06-08-2011
Where do you run this sed command? At command prompt or it lies inside a file..? Did you get any output to the sed command in post# 5? As an alternate try with awk..
Code:
ck_size=5
awk -v d="$ck_size" 'NR==2{print "values is " d}1' inputfile
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