07-29-2019
Quote:
Originally Posted by
Corona688
AFAIK the multiple characters as RS ought to work with most awk, what won't work with some is RS as a regex.
Hi Corona688,
That might be true in some implementations. (And the BSD based
awk on MacOS Version 10.14.5 does work that way.) However, the description of the
awk RS variable in the standards is:
Quote:
The first character of the string value of RS shall be the input record separator; a
<newline> by default. If RS contains more than one character, the results are
unspecified. If RS is null, then records are separated by sequences consisting of a
<newline> plus one or more blank lines, leading or trailing blank lines shall not
result in empty records at the beginning or end of the input, and a <newline> shall
always be a field separator, no matter what the value of FS is.
This User Gave Thanks to Don Cragun For This Post:
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JOIN(1) General Commands Manual JOIN(1)
NAME
join - relational database operator
SYNOPSIS
join [ options ] file1 file2
DESCRIPTION
Join forms, on the standard output, a join of the two relations specified by the lines of file1 and file2. If file1 is `-', the standard
input is used.
File1 and file2 must be sorted in increasing ASCII collating sequence on the fields on which they are to be joined, normally the first in
each line.
There is one line in the output for each pair of lines in file1 and file2 that have identical join fields. The output line normally con-
sists of the common field, then the rest of the line from file1, then the rest of the line from file2.
Fields are normally separated by blank, tab or newline. In this case, multiple separators count as one, and leading separators are dis-
carded.
These options are recognized:
-an In addition to the normal output, produce a line for each unpairable line in file n, where n is 1 or 2.
-e s Replace empty output fields by string s.
-jn m Join on the mth field of file n. If n is missing, use the mth field in each file.
-o list
Each output line comprises the fields specifed in list, each element of which has the form n.m, where n is a file number and m is a
field number.
-tc Use character c as a separator (tab character). Every appearance of c in a line is significant.
SEE ALSO
sort(1), comm(1), awk(1)
BUGS
With default field separation, the collating sequence is that of sort -b; with -t, the sequence is that of a plain sort.
The conventions of join, sort, comm, uniq, look and awk(1) are wildly incongruous.
JOIN(1)