Question

I have following string

â   â³ eGalax Inc. USB TouchController          id=9    [slave  pointer  (2)]
â   â³ eGalax Inc. USB TouchController          id=10   [slave  pointer  (2)]

and would like to get the list of id ? How this can be done using sed or something else ?

Answer 1

I pasted the contents of your example into a file named so.txt.

$ cat so.txt | awk '{ print $7 }' | cut -f2 -d"="
9
10

Explanation:

1. cat so.txt will print the contents of the file to stdout.
2. awk '{ print $7 }' will print the seventh column, i.e. the one containing id=n
3. cut -f2 -d"=" will cut the output of step #2 using = as the delimiter and get the second column (-f2)

If you’d rather get id= also, then:

$ cat so.txt | awk '{ print $7 }' 
id=9
id=10