Vladislavs Dovgalecs
Reputation: 1631
Extract specific lines (indices given) from a file (strings)
I have two files: lines.txt and idx.txt
lines.txt:
aaa ggg sss
ww ee ttt
qq ee gg ccc
vvv bb b www ee
ppp dff f gg qq
pp qq ee rr tt
ww qq ee rrr
idx.txt
2
4
5
I would like to use "idx.txt" to extract those specific lines from "lines.txt" file. The files are pretty big (tens of MB). Currently I am using the following line but it is slow:
awk 'NR=FNR{arr[FNR]=$0; next} {for(i in arr) if(i==$1) print arr[i]}' lines.txt idx.txt
I am generating the "idx.txt" files using a script, hence the extraction of the lines should be fast.
Has somebody more elegant solution?
Upvotes: 0
Views: 42
Answers (1)
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