how can I assign a variable to a linux command

[realtest]

I can print a specific line of a file with:
$ sed -n '20p' myFile

How can I store it in a variable (in a shell script)?

(I wasn't successful with "myVar=sed -n '20p' myFile" for example)

[verndog]

myVar=`sed -n '20p' myFile`

Will set it the first time, but you need to do that on each iteration.

That's old school. The newer way is

myVar=$(sed -n '20p' myFile)

[jr0sco]

Backward quote (`): Commands within backward quotes are executed and their output substituted into that location.

foo=`echo bar`
echo $foo

Output:
bar