filtering data with bash script

[nguyenthanhvuh]

Hi All - I need to filter out a large amount of data in a file and thought using bash script would be appropriate for this purpose. Greatly appreciate your help

The file has this format

something this is a line a
r3 request 1: 1
something this is a line b
r4 request 1: 0.3
something this is a line c
r5 request 1: 0.6
something this is a line d
r6 request 1: 0.02
something this is a line e
r7 request 1: 0.7



So I want to filter out lines that have score say <= 0.6 , thus the result would look something like

something this is a line b
r4 request 1: 0.3
something this is a line c
r5 request 1: 0.6
something this is a line d
r6 request 1: 0.02

[hazel]

This looks more like a job for awk. It would be relatively easy to give awk a rule to examine all lines containing with the regular expression "^r[0-9]" and pass only those for which the last field was within the specified range. Getting rid of the initial line of failed entries would be more tricky; you'd probably have to store the line in a variable while examining the next line, then print out both the stored line and the following one (or neither).