Linux and UNIX Man Pages

Test Your Knowledge in Computers #9
Difficulty: Easy
A CD-ROM is a type of optical disc that originated in 1982 in South Korea.
True or False?
Linux & Unix Commands - Search Man Pages

join(1) [bsd man page]

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 specified 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. 7th Edition April 29, 1985 JOIN(1)

Check Out this Related Man Page

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)

15 More Discussions You Might Find Interesting

1. Shell Programming and Scripting

join command

Hi, I'm using the join command and it appears to discard certain fields. Here are the two files i'm comparing: File1: 1 a 2 b 3 c 4 d 99 f 101 g 999 i 200 j File 2: 1 e 2 f 3 g 4 h 99 h (22 Replies)
Discussion started by: penfold
22 Replies

2. Shell Programming and Scripting

Shell Programming and Scripting

Hi, Iam having the files as follows: file1 aa aa aa aa ab ac ad ae file2 aa aa ab Outputfile: (20 Replies)
Discussion started by: nivas
20 Replies

3. Shell Programming and Scripting

cat in the command line doesn't match cat in the script

Hello, So I sorted my file as I was supposed to: sort -n -r -k 2 -k 1 file1 | uniq > file2 and when I wrote > cat file2 in the command line, I got what I was expecting, but in the script itself ... sort -n -r -k 2 -k 1 averages | uniq > temp cat file2 It wrote a whole... (21 Replies)
Discussion started by: shira
21 Replies

4. Shell Programming and Scripting

field separator in Perl

is there a similar parameter you can set in perl like FS in awk? I think I've read all the tutorials on the subject, but cannot get this map split and so on thing to work. I need to sort a file by columns, eg. first, third, fifth... The script I need to add this column sorting is this: use... (38 Replies)
Discussion started by: ahsog
38 Replies

5. Shell Programming and Scripting

Match data based on two fields, and append to a line

I need to write a program to do something like a 'vlookup' in excel. I want to match data from file2 based on two fields (where both match) in file1, and for matching lines, add the data from two of the fields from file2 to file1. If anyone knows something in perl or awk that can do this, I'd be... (20 Replies)
Discussion started by: jamessmith01
20 Replies

6. Shell Programming and Scripting

How to find a certain string in a file and replace it with a value from another file using sed/awk?

Hi Everyone, I am new to this forum and new to sed/awk programming too !! I need to find particular string in file1(text file) and replace it with a value from another text file(file2) the file2 has only one line and the value to be replaced with is in the second column. file 1: (assert (=... (21 Replies)
Discussion started by: paramad
21 Replies

7. Shell Programming and Scripting

awk problem

I am trying to isolate a username that contains spaces my input is like : username fullname --------------------------------------------- SYSTEM SYSTEM quarantine quarantine nigel Nigel Hope glennrosegarden Glenn Rose-garden... (20 Replies)
Discussion started by: frottage
20 Replies

8. Shell Programming and Scripting

Using columns from 2 files and extracting string

Hi All, I have 2 files with a common column. File 1 looks like NAME START POS1 POS2 N1 1234 1236 1237 N2 1245 1248 1250 .. .. File 2 looks like NAME STRING N1 ABCDEFGH N2 EFGHBCD N3 PQRSSTUV .. ...... ... (25 Replies)
Discussion started by: alpesh
25 Replies

9. Shell Programming and Scripting

Making case insensitive in awk

here is a statement awk '/CREATE PROCEDURE/,/elimiter/' "$file1" > onlyproc1.sql which mean cut from create procedure to Delimiter or delimiter and paste it in onlyproc1.sql... my query is how to make this case insensitive.. that is i want the above code to work whther it is Delimiter or... (26 Replies)
Discussion started by: vivek d r
26 Replies

10. Shell Programming and Scripting

How to remove mth and nth column from a file?

Hi, i need to remove mth and nth column from a csv file. here m and n is not a specific number. it is a variable ex. m=2 n=5 now i need to remove the 2nd and 5th line.. Please help how to do that. Thanks!!! (18 Replies)
Discussion started by: zaq1xsw2
18 Replies

11. Shell Programming and Scripting

awk pattern matching

I have two files, want to compare file1 data with file2 second column and print line which are not matching. Need help in matching the pattern, file2 second column number can be leading 0 or 00 or 000. Example: file1 1 2 3 file2 a,0001 b,02 c,000 d,01 e,2 f,0005 Expected output:... (20 Replies)
Discussion started by: vegasluxor
20 Replies

12. Shell Programming and Scripting

How to join one file with multiple files in a directory in UNIX?

Dear folks Hello I have a one file called (file1) which the structure looks like this 1 gi|358484521|ref|NW_003764373.1| 1 gi|358484520|ref|NW_003764374.1| 1 gi|358484519|ref|NW_003764375.1| . . . 30 gi|368484519|ref|NW_00449375.1| In addition, I have around 300... (19 Replies)
Discussion started by: sajmar
19 Replies

13. Shell Programming and Scripting

Need help Filtering Data from an API

Hi Everyone, I need help on figuring out a way to filter some data that I get back from an API. Im able to get all the data that Im looking for but I would like to know a way for me to filter it better. The data that Im getting back is basically 2 rows of data as seen here. Row 1 ... (25 Replies)
Discussion started by: TheStruggle
25 Replies

14. Shell Programming and Scripting

Replace alphabets in a string with their ASCII values

hi. I have a requirement where I need to REPLACE all alphabets from an alphanumeric input string into their respective ASCII decimal value. For example: If the input string is ABAC123, the output should be 65666567123 I am seeking a single line command, and I was trying searching for options... (21 Replies)
Discussion started by: kumarjt
21 Replies

15. Shell Programming and Scripting

awk to change value in field according to another

I am trying to use awk to check if each $2 in file1 falls between $2 and $3 of the matching $4 line of file2. If it does then in $5 of file2, exon if it does not intron. I think the awk below will do that, but I am struggling trying to is add a calculation that if the difference is less than 10,... (27 Replies)
Discussion started by: cmccabe
27 Replies

Featured Tech Videos