You're right. In this case, the numeric sort has no effect for good or ill, but is superfluous, should not be used
To make sure I made my point, please allow me to reiterate: In every case, it is a mistake to feed a numerically sorted file to a tool which only understands lexicographic sorting. In some cases, such as this one, it may not hurt, but it is never the right thing to do.
Tools which require lexicographic sorting include comm, join, and uniq.
join requires special attention because by default it requires sort -b, but if join's -t option is used, sort's -b must not be.
Quote:
Originally Posted by hanson44
But the OP said there was some problem with this.
And that piqued my curiosity, because it should work if the actual data does not deviate from the form of the sample data provided in post #4.
Hi,
I have one situation. I have some 6-7 no. of files in one directory & I have to extract all the lines which exist in all these files. means I need to extract all common lines from all these files & put them in a separate file.
Please help. I know it could be done with the help of... (11 Replies)
I am looking for a file with 'MCR0000000716214' in it. I tried the following command:
grep MCR0000000716214 *
The problem is that the folder I am searching in has over 87000 files and I am getting the following:
bash: /bin/grep: Arg list too long
Is there any command I can use that can... (6 Replies)
Hi! I have a large set of pairs of text files (each pair in their own subdirectory) and each pair shares head/tail (a couple of first and last lines) but differs in the middle part. I need to delete the heads/tails and keep only the middle portions in which they differ. The lengths of heads/tails... (1 Reply)
Hi ,
I have a text file in the format
DB2:
DB2:
WB:
WB:
WB:
WB:
and a second text file of the format
Time=00:00:00.473
Time=00:00:00.436
Time=00:00:00.016
Time=00:00:00.027
Time=00:00:00.471
Time=00:00:00.436
the last string in both the text files is of the... (4 Replies)
Hi
I have 2 files with following data
First file,
sp|Q676U5|A16L1_HUMAN,
Autophagy-related protein 16-1 OS=Homo sapiens GN=ATG16L1 PE=1 SV=2,
Maximum coiled-coil residue probability: 0.657 in position 163.
Maximum dimeric residue probability: 0.288 in position 163.
... (1 Reply)
Hi All,
I have two files like below:
File1
MYFILE_28012012_1112.txt|4
MYFILE_28012012_1113.txt|51
MYFILE_28012012_1114.txt|57
MYFILE_28012012_1115.txt|57
MYFILE_28012012_1116.txt|57
MYFILE_28012012_1117.txt|57
File2
MYFILE_28012012_1110.txt|57
MYFILE_28012012_1111.txt|57... (2 Replies)
I have two directories
Dir 1
/home/sid/release1
Dir 2
/home/sid/release2
I want to find the common files between the two directories
Dir 1 files
/home/sid/release1>ls -lrt
total 16
-rw-r--r-- 1 sid cool 0 Jun 19 12:53 File123
-rw-r--r-- 1 sid cool 0 Jun 19 12:53... (5 Replies)
Discussion started by: sidnow
5 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)