Hi,

What would be an efficient way to substitute lines of text
when portion of it matches with part of the text from another file?
Say I have the 2 files as follows -

file 1:

123|abc|777
234|cde|456
567|xyz|999

file 2:

789|efg|2222222
123|abc|9999999
786|uvw|1234567
123|xxx|0000000
234|cde|0000000
567|xyz|1111111

After processing file 2 using file 1 the output of it should be -

789|efg|2222222|NO MATCH
123|abc|9999999|777
786|uvw|1234567|NO MATCH
123|xxx|0000000|NO MATCH
234|cde|0000000|456
567|xyz|1111111|999

File 2 is quite a large file and file 1 has about 2000
lines

In reply to Substitute text string in a file with matching text from another file by tariqahsan

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