VARIABLES, RECORDS AND FIELDS
AWK variables are dynamic; they come into existence when they are first used.
Their values are either floating-point numbers or strings, or both, depending upon
how they are used. AWK also has one dimensional arrays; arrays with multiple
dimensions may be simulated. Several pre-defined variables are set as a program
runs; these are described as needed and summarized below.
Records
Normally, records are separated by newline characters. You can control how records
are separated by assigning values to the built-in variable RS. If RS is any single
character, that character separates records. Otherwise, RS is a regular expres-
sion. Text in the input that matches this regular expression separates the record.
However, in compatibility mode, only the first character of its string value is
used for separating records. If RS is set to the null string, then records are
separated by blank lines. When RS is set to the null string, the newline character
always acts as a field separator, in addition to whatever value FS may have.
Fields
As each input record is read, gawk splits the record into fields, using the value
of the FS variable as the field separator. If FS is a single character, fields are
separated by that character. If FS is the null string, then each individual char-
acter becomes a separate field. Otherwise, FS is expected to be a full regular
expression. In the special case that FS is a single space, fields are separated by
runs of spaces and/or tabs and/or newlines. (But see the section POSIX COMPATIBIL-
ITY, below). NOTE: The value of IGNORECASE (see below) also affects how fields are
split when FS is a regular expression, and how records are separated when RS is a
regular expression.
. . . . .
Built-in Variables
FS The input field separator, a space by default.
RS The input record separator, by default a newline.
Hi everyone,
If someone out there could help me out with this problem. I would really appreciate it.
I am trying to convert a file into xml format using Unix shell scripts.
The file has fields with each field having a certain number of bytes, but the fields are not delimited by anything... (10 Replies)
If someone out there could help me out with this problem. I would really appreciate it.
I am trying to convert xml into text file(fixed length) using Unix Borne shell scripts.
My xml file:
<root>
<header_rec recordtype="00">
<record_id>00</record_id>
<country_code>AK></country_code>... (0 Replies)
Hello,
I'm wondering if you may know of a simple file based UNIX utility that can be used to store and retrieve values on a flat file, let's say i have a file called "kru", i'd like to be able to specify a request like:
while(....)
if ; then
kru.fld2 = $rec_cnt
kru.fld3 =... (4 Replies)
ftp -n -v <<EOF
verbose
open 3.57.40.79
user infodvlp pr0gram
ascii
lcd /home/a501420038/GLA/Success_Load/
cd /ftp/SrcFiles/csg/InstruAsia/
get AU_Success_Log.txt
close
quit
EOF
Please help on this, this gives the out put "AU_Success_Log.txt?" As question mark in the last what will... (1 Reply)
Hi,
How to separate numbers and words(with full alphabets) in a particular file and store it in two different files.
Please help me out for this.Using shell scripting.
:confused::confused: (1 Reply)
I am learning how to write shell scripts and have come across an issue. I'm trying to write a script that looks for a directory called public_html, and if it finds one, to print the number of lines that contain applet tags (containing '<applet') in all files that end in either .html or .htm that... (7 Replies)
Hi there,
Firstly, I have no experience with shell scripts so would really appreciate some help.
I have the following shell script that is causing some problems:
moveit()
{
&& set -x
if
then
DOUBLE_DELIVERY=$(grep... (6 Replies)
Hi Friends,
I have a shell script which does some operations etc, would it be possible to create an executable file out from this shell script? meaning the executable file is not editable, thus the source code will not be visible to other users for copyright reasons.
Please help, thanks! (1 Reply)
Bash on RHEL 6.2
We have multiple shell scripts executed by cron jobs. Each Shell script has its own log files currently. Most of them have logs generated using spool command from Oracle RDBMS's sqlplus commmand.
Sample:
#!/bin/bash
sqlplus -s scott/tiger << EOF
spool... (5 Replies)