Bash best way to extract var from multiple different string on different line

Question

the output of my command is:

scan: DVD has 6 title(s)
...some text...
+ title 1:
...some text...
  + duration: 00:43:12
...some text...
+ title 2:
...some text...
  + duration: 00:43:12
...some text...
+ title 3:
...some text...
  + duration: 00:41:15

i want to have var for:

6 from scan: DVD has 6 title(s)

1 from + title 1:

00:43:12 from + duration: 00:43:12

not that the two last one are linked, maybe use an array For title and duration title[1]="00:43:12"

actually i'm only able to extract one information at a time but i don't want to run the command multiple time if possible. for example:

[command] |& grep -Po '(?<=DVD has )([0-9]+)')

maybe i should store the command output to a file first? what is the best way to start please ?

For just the parsing alone, let alone what you intend to do with the parsed data, I would recommend using a different language. bash (and shell in general) is not really meant for data processing; it's meant for process control and file handling. — chepner
– chepner, Commented Feb 12, 2014 at 13:58
Ok, so maybe i should store the command output to file (+/- 600 lines) and parse the file for different var? — user3260371
– user3260371, Commented Feb 12, 2014 at 14:00

kojiro · Accepted Answer · 2014-02-12 14:23:03Z

0

You didn't specify what you wanted to do with the values, but here's an awk script that gathers them and outputs them for every line of input:

yourcommand | awk '
  NR==1{ titlecount=$4; }
  /\+ title/{ curtitle=$3; }
  /\+ duration/{ dur=$3; }
  1{ print titlecount, curtitle, dur; }
'

answered Feb 12, 2014 at 14:23

kojiro

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2 Comments

user3260371 Over a year ago

Thanks, want to store values in array: title[number]="associated duration". Your awk script print lines that match + title or + duration several times, it also print a lot of empty lines, lines that don't match ?

kojiro Over a year ago

@Eelisland I can't really tell exactly what output you want. Why do you want the values in an array? What will you do with the array?

user3260371 · Accepted Answer · 2014-02-13 13:46:02Z

0

sorry my question is not clear. Based on your answer

cat DVDscan.txt | awk '
  /+ title/{gsub(":","",$3); print $3 }
  /+ duration:/{ print $3 }'

Output:

want to store the output to multiples array:

title[1]="00:43:12"

so i will know the total number of title and can access duration for specified title.

Thanks for your time and help.

answered Feb 13, 2014 at 13:46

user3260371

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