在Linux中从文件读取

Question

I have to read from file and assign values to variables. Then I have to save them in another file. I know how to do the second and third part but I don't know how to read from file.

The sample file looks like this. how do I eat up unwanted things like Points, newline and store values somewhat like a = 21, b = 8 and so on.

(Please note there is no empty line after A 21. Assume it as A 21\\nB 8 and so on)

Points:

A 21 
B 8
C 2
D 13
E 24

Answer 1

You can check if the variables are empty. Something like this:

while read -r var val; do 
    [[ ! -z $var && ! -z $val ]] && echo "$var=$val"
done < file

Test:

$ cat file
Points:

A 21
B 8
C 2
D 13
E 24
$ while read -r var val; do [[ ! -z $var && ! -z $val ]] && echo "$var=$val"; done < file
A=21
B=8
C=2
D=13
E=24

---

To answer your question in comments…

$ . <(while read -r var val; do [[ ! -z $var && ! -z $val ]] && echo "$var=$val"; done < file)
$ echo $A
21
$ echo $B
8

Answer 2

也许我在想这个，但这样做不行吗？

sed 's/ / = /' file > newfile