bash - egrep -v match lines containing some same text on each line -

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so have 2 files.

example of file 1 content.

/n01/mysqldata1/mysql-bin.000001 /n01/mysqldata1/mysql-bin.000002 /n01/mysqldata1/mysql-bin.000003 /n01/mysqldata1/mysql-bin.000004 /n01/mysqldata1/mysql-bin.000005 /n01/mysqldata1/mysql-bin.000006

example of file 2 content.

/n01/mysqlarch1/mysql-bin.000004 /n01/mysqlarch1/mysql-bin.000001 /n01/mysqlarch2/mysql-bin.000005

so want match based on mysql-bin.00000x , not rest of file path in each file differ between file1 , file2.

here's command i'm trying run

cat file1 | egrep -v file2

the output i'm hoping here be...

/n01/mysqldata1/mysql-bin.000002 /n01/mysqldata1/mysql-bin.000003 /n01/mysqldata1/mysql-bin.000006

any appreciated.

just compare based on /:

$ awk -f/ 'fnr==nr {a[$nf]; next} !($nf in a)' f2 f1 /n01/mysqldata1/mysql-bin.000002 /n01/mysqldata1/mysql-bin.000003 /n01/mysqldata1/mysql-bin.000006

explanation

this reads file2 in memory , compares file1.

  • -f/ set field separator /.
  • fnr==nr {a[$nf]; next} while reading first file (file2), store every last piece array a[]. since set field separator /, mysql-bin.00000x part.
  • !($nf in a) when reading second file (file1) check if last field (mysql-bin.00000x part) in array a[]. if not, print line.

i'm having 1 problem i've noticed when testing. if file2 empty nothing returned @ expected every line in file1 returned. me please? – user2841861.

then problem fnr==nr matches when reading second file. prevent this, cross check "reading a[] array" action done on first file:

awk -f/ 'fnr==nr && argv[1]==filename {a[$nf]; next} !($nf in a)' f2 f1                  ^^^^^^^^^^^^^^^^^^^^

from man awk:

argv

the command-line arguments available awk programs stored in array called argv. argc number of command-line arguments present. see section other command line arguments. unlike awk arrays, argv indexed 0 argc - 1


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