Bash Question
Grep user input to find number
I have a File which looks like this
example text [1234] [0] Part 2 /var/tmp/path
example text [1234] [0] Part 3 /var/tmp/path
example text [1234] [0] Some Text more text
example text [1235] [0] Part 4 /var/tmp/path
example text [1235] [0] Part 5 /var/tmp/path
example text [1236] [0] Part 6 /var/tmp/path
example text [1236] [0] other text foo bar
I have another text file where users can write the parts in.
So it can look like this:
Part 2
Part 4
Part 6
I need a grep or so the second file gets read and it searched for the numbers in the first bracket, and saves them into an variable
In the example I'd need to get the output
1234
1235
1236
And it should be in a variable to use it for further work
So far I tried it with
grep -F -f parts.txt search.log
But I don't know how to not get the line where Part 2, 4 and 6 are shown, but only the number within the first brackets
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Answer Source
Here is one way to do it.
myparts=$(grep -F -f parts.txt search.log | awk -F'[][]' '{print $2}' | sort | uniq)
parts.txt is the file that users write part numbers in.
grep returns the lines where part number matches.
awk uses [ and ] as delimiters to extract the first word between them
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