Sorry, should have checked my sort parameters the 4th field was supposed to be sorted in descending order to do the sort needs the r flag (not d) so your correct answers are:
For the awk logic: -F\; use semicolon as the field separator, this allows awk to split the line up into $1, $2 ... $NF fields
!($1$2 in A) means only process lines where the value of field1 concatenated with field2 (your unique key) is not already in the array A
print $0 print the entire line
So in prints the first line where each unique key value occurs.
A[$1$2] add value field1 concatenated with field2 to the array A
This User Gave Thanks to Chubler_XL For This Post:
Hi,
I would like to know given that I have 3 columns.
Let say I have first 3 columns to do operation and these operation output is printed out each line by line using AWK and associative array.Currently in the output file, I do a sort by -r for the operation output.
The problem comes to... (1 Reply)
hello..
I have big file and so far I was able to shink it and make smaller with certains values that I need..
vendor1|2000|1
vendor2|1000|1
vendor2|5000|1
vendor2|500|2
vendor3|1000|2
vendor3|500|3
vendor4|500|3
Vendor5|500|1
vendor6|500|3
Vendor7|1000|1
Vendor8|1000|774... (3 Replies)
Hi,
Is there any way to sort a file in cshell by sort command, sorting it by multiple fields, like to sort it first by the second column and then by the first column.
Thanks forhead (1 Reply)
Howdy!
Need to sort a large .txt file containing the following, using sort. First based on the 1st column, and then on the 2nd column:
Group01.01 1000500 31 0.913 -1.522974494
Group01.01 1001500 16 0.684 -0.967496041
Group01.01 36500 19 0.476 na
Group01.02 365500 15 0.400 na... (1 Reply)
hi all,
i have a file , having few columns. i wanted to sort it based on 2nd column and then based on 1st column. But i have some problem in first column.
first column have characters and numbers, but problem is number of characters are not same in all rows. Few rows have 13 characters and then... (3 Replies)
New to unix.
I need to sort the records of a file by a control number field. That field is in POS 16 through 28. How do I do that? There are no delimiters, or spaces to separate fields.
See example below. Each line is a record.
REC1CCYYMMDD0018888888888888ABCDE... (1 Reply)
Hi All,
I have one requirement, where I need to have output of ls -l command sorted on 1) first on filename 2) last modified time ( descending ) - latest change first.
I am not able to figure out how to do it..
Also I dont have a way to change Date display for ls -ltr command..
I am... (1 Reply)
I have /tmp dir with filename as:
010020001_S-FOR-Sort-SYEXC_20160229_2212101.marker
010020001_S-FOR-Sort-SYEXC_20160229_2212102.marker
010020001-S-XOR-Sort-SYEXC_20160229_2212104.marker
010020001-S-XOR-Sort-SYEXC_20160229_2212105.marker
010020001_S-ZOR-Sort-SYEXC_20160229_2212106.marker... (4 Replies)
Discussion started by: gnnsprapa
4 Replies
LEARN ABOUT DEBIAN
plan9-join
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 one of the file names 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.
Input fields are normally separated spaces or tabs; output fields by space. In this case, multiple separators count as one, and leading
separators are discarded.
The following options are recognized, with POSIX syntax.
-a n In addition to the normal output, produce a line for each unpairable line in file n, where n is 1 or 2.
-v n Like -a, omitting output for paired lines.
-e s Replace empty output fields by string s.
-1 m
-2 m Join on the mth field of file1 or file2.
-jn m Archaic equivalent for -n m.
-ofields
Each output line comprises the designated fields. The comma-separated field designators are either 0, meaning the join field, or
have the form n.m, where n is a file number and m is a field number. Archaic usage allows separate arguments for field designators.
-tc Use character c as the only separator (tab character) on input and output. Every appearance of c in a line is significant.
EXAMPLES
sort /etc/passwd | join -t: -1 1 -a 1 -e "" - bdays
Add birthdays to the /etc/passwd file, leaving unknown birthdays empty. The layout of /adm/users is given in passwd(5); bdays con-
tains sorted lines like
tr : ' ' </etc/passwd | sort -k 3 3 >temp
join -1 3 -2 3 -o 1.1,2.1 temp temp | awk '$1 < $2'
Print all pairs of users with identical userids.
SOURCE
/src/cmd/join.c
SEE ALSO sort(1), comm(1), awk(1)BUGS
With default field separation, the collating sequence is that of sort -b -ky,y; with -t, the sequence is that of sort -tx -ky,y.
One of the files must be randomly accessible.
JOIN(1)