sed - How to find the matching records from 2 files in unix -


i have 2 files contains email_ids. 1. test1.txt 2. test2.txt

test1.txt contents are:

abc@gmail.com xyz@gmail.com mns@gmail.com

test2.txt contents are:

jpg@gmail.com joy@yahoo.com abc@gmail.com pet@yahoo.com

here abc@gmail.com common id between test1.txt , test2.txt. want find out such id's these 2 files , insert them 1 file.

please suggest. need id's common in between these 2 files.

try:

awk 'nr==fnr{a[$1]; next} $1 in a' file1 file2 > file.new

--edit: added explanation --

awk '              nr==fnr {               # when first file being read (only fnr , nr equal)     a[$1]                 # create (associative) element in array first field index      next                  # start reading next record (line)   }                 $1 in                 # while reading second file, if field 1 present in array print record (line)  ' file1 file2 > file.new  # first read file1 first file , file2 second file , write output 3rd file.

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