My situation :

Textfile : test.txt

$test

Variable test declared in the terminal

test=hello

Now when I cat the file, output is :

$test

My question how can I cat the file with the declared output from the variable?

CodePudding user response：

cat itself does not evaluate any variables. To do it, the command line must be evaluated by bash twice. This is done by the eval command. Thus the result should be

eval echo $(cat test.tex)

CodePudding user response：

Add export in the file then execute it

example

export test="Hi I'm Ender"

Then try to

source ./blabla.txt

Note : You need echo not cat

Also your can use

test="Yes"

Or maybe your asking how to execute variable in script?