How to pass text file contents as argument to console application? [duplicate]
./myapp `cat text_file`
Or
./myapp $(cat text_file)
Or use double quotes to pass all the text as a single argument
./myapp "$(cat text_file)"
./myapp "`cat text_file`"
Very simple, cat it.
cat file | some_script.sh
Have a look here for further help.