bashscript extract info from custom row

Question

under command :gpart show

i get the output 
=>      34  31457213  ada0  GPT  (15G)
        34       128     1  freebsd-boot  (64k)
       162  29360000     2  freebsd-ufs  (14G)
  29360162   1572864     3  freebsd-swap  (768M)
  30933026    524221        - free -  (10GB)

how can i extract just 14G from 3rd line and 10GB from last line?

the 14/10GB values are never the same, which makes my work harder to do.

i manage to get some results using

cat test | sed 's/\|/ /' | awk '{print $6}{print $5}' but i still have to extract just that info,

any ideas? please thanks.

:gpart show |awk 'NR == 3 || NR == 5 { print $NF} ' |sed "s/(//;s/)//" — VenkatC
– VenkatC, Commented Oct 30, 2016 at 4:07
If you specifically want the freebsd-ufs partition, you should filter on that rather than hoping it will always be line 3... — Mark Setchell
– Mark Setchell, Commented Oct 30, 2016 at 9:15

heemayl · Accepted Answer · 2016-10-30 04:08:17Z

2

With awk:

awk -F '[()]' 'NR==3 {print $(NF-1)} END{print $(NF-1)}' file.txt

-F '[()]' sets the field delimiter as ( or )
NR==3 {print $(NF-1)} prints the desired field for the third line
END{print $(NF-1)} prints the desired field for the last line

Example:

% cat file.txt
    34  31457213  ada0  GPT  (15G)
        34       128     1  freebsd-boot  (64k)
       162  29360000     2  freebsd-ufs  (14G)
  29360162   1572864     3  freebsd-swap  (768M)
  30933026    524221        - free -  (10GB)

% awk -F '[()]' 'NR==3 {print $(NF-1)} END{print $(NF-1)}' file.txt
14G
10GB

answered Oct 30, 2016 at 4:08

heemayl

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VIPIN KUMAR · Accepted Answer · 2016-10-30 09:03:32Z

2

You can try below solution -

vipin@kali:~$ cat kk.txt
     34  31457213  ada0  GPT  (15G)
        34       128     1  freebsd-boot  (64k)
       162  29360000     2  freebsd-ufs  (14G)
  29360162   1572864     3  freebsd-swap  (768M)
  30933026    524221        - free -  (10GB)
   vipin@kali:~$ awk -F'\(|\)' 'NR==3 || NR==5 {print $(NF -1)}' kk.txt
14G
10GB

explanation -

use escape character \ to use () and | for multiple Field seperator and NR to select multiple lines and NF-1 to print last column when () is field seperator.

edited Oct 30, 2016 at 9:03

answered Oct 30, 2016 at 8:56

VIPIN KUMAR

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riteshtch · Accepted Answer · 2016-10-30 04:09:31Z

1

$ cat file 
      34  31457213  ada0  GPT  (15G)
        34       128     1  freebsd-boot  (64k)
       162  29360000     2  freebsd-ufs  (14G)
  29360162   1572864     3  freebsd-swap  (768M)
  30933026    524221        - free -  (10GB)
$ egrep -o '\([0-9]+\w+\)$' file | sed -n '3p;5p'
(14G)
(10GB)

matches regex '$[0-9]+\w+$$' i.e 1 or more digits followed by 1 or more word chars, both contained in round brackets and using sed to print 3rd and 5th line

answered Oct 30, 2016 at 4:09

riteshtch

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