Append the result of another shell script to the last line of a file

How to do this scenario? Open a file for edit mode and go to last line in the file and append the result of another shell script to this file.

Hi, you can use >> to append to a end of a file, p.e. you have two files, file1 and file2 and you want to append file2 to the end of file 1, then you do:
cat file2 >> file1

that's all.
another example, you directly put the output of a script shell,

the scripts "script.sh":
#!/bin/sh
ls -l
#end of script

and the receptor file "receptor_file" and it's a file already existing so...

./script.sh >> receptor_file

do de job...

HTH