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Full Discussion: Perl to update field in file based of match to another file
Top Forums Shell Programming and Scripting Perl to update field in file based of match to another file Post 303000280 by durden_tyler on Friday 7th of July 2017 10:41:46 PM
Old 07-07-2017
Quote:
Originally Posted by cmccabe
...
...
if the last field is blank then a .(dot) results.
...
For line # 2 of "file2.txt", this:

Code:
$F[$F[6]=~/exonic/?11:8]

returns $F[8] which is "."

However, this:

Code:
grep {$x=~/$_/} keys %m

does not return anything because none of the keys of hash %m (shown below)

Code:
'NM_005101'
'NM_000310'
'NM_022089'

exist in the string "."

Therefore the variable $r is an empty string.
And hence, this:

Code:
print join("\t",@F,$r);

does not append anything to the array @F for line # 2 of "file2.txt".
This User Gave Thanks to durden_tyler For This Post:
cmccabe
 

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LEARN ABOUT DEBIAN

combine

COMBINE(1)																COMBINE(1)

NAME

       combine - combine sets of lines from two files using boolean operations

SYNOPSIS

       combine file1 and file2

       combine file1 not file2

       combine file1 or file2

       combine file1 xor file2

       _ file1 and file2 _

       _ file1 not file2 _

       _ file1 or file2 _

       _ file1 xor file2 _

DESCRIPTION

       combine combines the lines in two files. Depending on the boolean operation specified, the contents will be combined in different ways:

       and Outputs lines that are in file1 if they are also present in file2.

       not Outputs lines that are in file1 but not in file2.

       or  Outputs lines that are in file1 or file2.

       xor Outputs lines that are in either file1 or file2, but not in both files.

       "-" can be specified for either file to read stdin for that file.

       The input files need not be sorted, and the lines are output in the order they occur in file1 (followed by the order they occur in file2
       for the two "or" operations). Bear in mind that this means that the operations are not commutative; "a and b" will not necessarily be the
       same as "b and a". To obtain commutative behavior sort and uniq the result.

       Note that this program can be installed as "_" to allow for the syntactic sugar shown in the latter half of the synopsis (similar to the
       test/[ command). It is not currently installed as "_" by default, but you can alias it to that if you like.

SEE ALSO

       join(1)

AUTHOR

       Copyright 2006 by Joey Hess <joey@kitenet.net>

       Licensed under the GNU GPL.

moreutils							    2012-04-09								COMBINE(1)
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