You're seeing the last line come out at top because you're not closing the pipe to the sort command and thus your print is happening before sort finishes and prints it's output. Here's my solution, which also doesn't require knowing the number of records between before hand:
Code:
awk '
NR == 1 { print; next; }
{
if( last )
print last | "sort -k2nr,2";
last = $0;
}
END {
close( "sort -k2nr,2" ); # finish sort let sort print
print last;
}
' input-file
Hmmm.... I don't quite follow how it works, but it does.
How sorting only one line at a time ends up sorting the whole list (not including the last line?
Care to explain?
Also, some awk-s have the limit on how many file handlers (in this case "sort" invocations) one can have opened - some awk-s have it set to 9. So if your awk has limit set to 9, and you have more than 9 lines in your file, your awk might bomb out....
I have i got a requirement like below.
I have input file which contains following fixed width records.
00000000000088500232007112007111
I need the full record and concatenated with ~ and characters from 1to 5 and concatenated with ~ and charactes from 10 to 15
The out put will be like... (1 Reply)
Hi @ all
I'm trying to achive to this problem,
I've a 2-column composed file as the following:
192.168.1.2 2
192.168.1.3 12
192.168.1.2 4
192.168.1.4 3
cpc1-swan1-2-3-cust123.swan.cable.ntl.com 4
192.168.1.3 5
192.168.1.2 10
192.168.1.4 8... (8 Replies)
How do I use awk to find the records in a file that contains two specific strings?
I have tried piping and using awk two times, but I don't know how to do it in one action. (2 Replies)
Hi,
i want to generate print statement using awk.
i have 20+ and 30+ fields in each line
Now its priting only first eight fields print statement as output not all.
my record is as shown below filename
... (2 Replies)
I have an initial record 0.018
I would like a script that would for i=0;i<200;i++ print
0.018*1
0.018*2
0.018*3
0.018*4
...
0.018*200
using newline. (7 Replies)
Hi! all
can any one tell me how to compare current record of column with next and previous record in awk without using array
my case is like this
input.txt
0 32
1 26
2 27
3 34
4 26
5 25
6 24
9 23
0 32
1 28
2 15
3 26
4 24 (7 Replies)
how to use "awk" to print any record has pattern not equal ? for example my file has 5 records & I need to get all lines which $1=10 or 20 , $2=10 or 20 and $3 greater than "130302" as it shown :
10 20 1303252348212B030
20 10 1303242348212B030
40 34 1303252348212B030
10 20 ... (14 Replies)
Hi all , I have two files : dblp.xml with dblp records and itu1.txt with faculty members records. I need to find out how many dblp records are related to the faculty members. More specific: I need to find out which names from itu1.txt are a match in dblp. xml file , print them and show how many... (4 Replies)
Discussion started by: iori
4 Replies
LEARN ABOUT 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 /adm/users | join -t: -a 1 -e "" - bdays
Add birthdays to password information, leaving unknown birthdays empty. The layout of is given in users(6); bdays contains sorted
lines like
tr : ' ' </adm/users | 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
/sys/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)
11-23-2011
