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No NILA it didn work

If I use this sed -e '$a $var' file1 > file2 it does work but it dosnt read var as a variable rather it reads it as text and place text "$var" at the end of...

I used this because I wanted to append the value of var at the end of the file. it reads data from file1 and appends var at the end and save it in file 2

var=1234
sed -e "$a $var" file1 > file2

Hi All,

I just want to append the value in variable at the end of the file.

var=1234
sed -e "$a $var" file1 > file 2.

But I get this error
sed: -e expression #1, char 4: unknown...