问题
Really beginner of bash and scripting so sorry if it is very basic question to You.
I have file1 with ~1 million rows contain two fields in every row. I have file2 with ~270.000 rows, single entry in every rows. It is common with file1 field 1.
The goal is to have a filtered list from the file1 (keep the filed1 and field2 entries) based on file2 entries.
Example:
file1
1 A
2 B
3 C
4 C
5 D
6 A
7 G
8 K
122 F
.
.
56677 A
.
7272727272 A
1.000.000 A
File2:
1
2
3
9
122
56677
7272727272
I want filter the first column based on file2 and output should be like this:
1 A
2 B
3 C
122 F
56677 A
7272727272 A
回答1:
try this line, if it gave expected output:
grep -Fwf file2 file1
or
awk 'NR==FNR{a[$0]=1;next}a[$1]' file2 file1
来源：https://stackoverflow.com/questions/22837707/filtering-file-entries-based-on-another-file-as-match-condition