06-09-2011
How to read a text file and assign the values in the same to a variable in loop
Hi,
I have a text file with multiple lines, each having data in the below format <DOB>,<ADDRESS>
I have to write a script which reads each line in the text file in loop, assign the values to these variables and do some further processing in it.
Using the following code prints the values but I need them in variables.Also, it reads only first line of the file.
cat filename | paste -d"," - - - | awk 'BEGIN{FS=","}{print "DOB="$1" ADDRESS="$2" }'
Am I wrong in my approach?
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cat(1) General Commands Manual cat(1)
NAME
cat - concatenate, copy, and print files
SYNOPSIS
file ...
DESCRIPTION
reads each file in sequence and writes it on the standard output. Thus:
prints file on the default standard output device;
concatenates file1 and file2, and places the result in file3.
If is appears as a file argument, uses standard input. To combine standard input and other files, use a combination of and file arguments.
Options
recognizes the following options:
Omit line numbers from blank lines when
option is specified. If this option is specified, the option is automatically selected.
Print a
character at the end of each line (prior to the new-line). If this option is specified, the option is automatically selected.
Display output lines preceded by line numbers, numbered
sequentially from 1.
Replace multiple consecutive empty lines with one empty
line, so that there is never more than one empty line between lines containing characters.
Silent option.
suppresses error messages about non-existent files, identical input and output, and write errors. Normally, input and output
files cannot have identical names unless the file is a special file.
Print each tab character as
and form feed character as If this option is specified, the option is automatically selected.
Do not buffer output (handle character-by-character).
Normally, output is buffered.
Cause non-printing characters
(with the exception of tabs, new-lines and form-feeds) to be printed visibly. Control characters are printed using the form
(Ctrl-X), and the DEL character (octal 0177) is printed as (see ascii(5)). Single-byte control characters whose most signifi-
cant bit is set, are printed using the form where x is the character specified by the seven low order bits. All other non-
printing characters are printed as where x is the character specified by the seven low order bits. This option is influenced
by the environment variable and its corresponding code set.
EXTERNAL INFLUENCES
Environment Variables
provides a default value for the internationalization variables that are unset or null. If is unset or null, the default value of "C" (see
lang(5)) is used. If any of the internationalization variables contains an invalid setting, will behave as if all internationalization
variables are set to "C". See environ(5).
If set to a non-empty string value, overrides the values of all the other internationalization variables.
determines the interpretation of text as single and/or multi-byte characters, the classification of characters as printable, and the char-
acters matched by character class expressions in regular expressions.
determines the locale that should be used to affect the format and contents of diagnostic messages written to standard error and informa-
tive messages written to standard output.
determines the location of message catalogues for the processing of
International Code Set Support
Single- and multi-byte character code sets are supported.
RETURN VALUE
Exit values are:
0 Successful completion.
>0 Error condition occurred.
EXAMPLES
To create a zero-length file, use any of the following:
The following prints for all the occurrences of tab character in file1
To suppress error messages about files that do not exist, use:
If file2 does not exist, the above command concatenates file1 and file3 without reporting the error on file2. The result is the same if
option is not used, except that displays the error message.
To view non-printable characters in file2, use:
WARNINGS
Command formats such as
overwrites the data in file1 before the concatenation begins, thus destroying the file. Therefore, be careful when using shell special
characters.
SEE ALSO
cp(1), more(1), pg(1), pr(1), rmnl(1), ssp(1).
STANDARDS CONFORMANCE
cat(1)