Gurus,
I am looking for a book on Awk programming.
A quick Google search gave me Amazon.com: The AWK Programming Language (9780201079814): Alfred V. Aho, Brian W. Kernighan, Peter J. Weinberger: Books by Alfred Aho.
Is there anything other than that? Any advice?
Thanks.
Al. (1 Reply)
Hello, all
For a 1-dimensional array, such as
myarr_1=1
myarr_1=2
myarr_1=3I know I can write a loop as below to show the array member one by one:
for (i in myarr_1){print i, myarr_1}Now, suppose I have a two dimensional array such as:
myarray_2=1 myarray_2=2
myarray_2=10 myarray_2=20My... (3 Replies)
Dear All,
I am struggling with the following task and would appreciate some help. I have a large table (file1.txt). The first column of this table contains an ID. I would like to replace the ID with a label according to a reference file.
Here is an example:
cat infile.txt
0 AJ2312 310 ... (7 Replies)
Gents,
Can you please help me to solve this case
In my input file I have a values in column 49 which always need to be one, but sometimes the system create a value 2, in this case I need to go to search in the original file and replace the values in the row where the value 2 is and in the... (6 Replies)
Hi,
I need a ksh script to replace indirect directory references in an .ini file with a env variable using sed or awk.
The .ini file is for example as such:
A=..
B=../
C=../..
D=../../
E=../bin
F=../../bin
G=../../bin/xml
H=../../bin/xml/
Need to replace an instance of .. or... (2 Replies)
Hi,
I'd be grateful for your help with the following:
I have a file with a single column (file1). Let's say the values are:
a
b
c
5
d
I have a second, reference file (ref_file), which is colon-delimited, and is effectively a key. Let's say the values in it are:
a:1
b:2
c:3
d:4... (4 Replies)
Discussion started by: aberg
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)