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Top Forums Shell Programming and Scripting Extracting fixed length number from a text file Post 302994265 by dsid on Tuesday 21st of March 2017 06:16:36 AM
Old 03-21-2017
Quote:
Originally Posted by Aia
I suggest to use Perl instead which is what that support was named after.
Code:
perl -nle '/\[(\d+)\]/ and print $1' dsid.file
24013935350549886999873

Code:
perl # Perl binary.
-n # loop through the lines of the file dsid.file
-l  # deal with newlines.
-e # execute what follows as Perl code.
/\[(\d+)\]/  # capture any amount of digits as long as there are inside opening and closing brackets.
and print $1 # if a capture was successful in the line, display what it was captured.

I tweaked your code a little as it may happen that I get a text file from which I have to extract 23 digits and these digits can be surrounded by alphanumeric characters and the fact that I am only looking for 23 digits

Code:
$ cat ARNs.txt
AD. 16.03.

[adfasdfasdfa82401393536255192580664asdfjkadhfa]

CASE ID: 20170218881083
Original presentment record for ARN  [24013935350549886999873] not found
for Re-presentment

CASE ID: 20170218881444
Original presentment record for ARN  [24013935361551920891659] not found
for Re-presentment

CASE ID: 20170218881447
Original presentment record for ARN  [24013935356550908226927] not found
for Re-presentment

CASE ID: 20170221894303
Original presentment record for ARN  [24013936003600942122783] not found

CASE ID: 20170221894378
Original presentment record for ARN  [24013935362551925806644] not found
for Re-presentment

tweaked code

Code:
$perl -nle '/(\d{23})/ and print $1' ARNs.txt

can you please suggest your comments on the new code
 

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fmt(1)								   User Commands							    fmt(1)

NAME
fmt - simple text formatters SYNOPSIS
fmt [-cs] [-w width | -width] [inputfile...] DESCRIPTION
fmt is a simple text formatter that fills and joins lines to produce output lines of (up to) the number of characters specified in the -w width option. The default width is 72. fmt concatenates the inputfiles listed as arguments. If none are given, fmt formats text from the standard input. Blank lines are preserved in the output, as is the spacing between words. fmt does not fill nor split lines beginning with a `.' (dot), for compatibility with nroff(1). Nor does it fill or split a set of contiguous non-blank lines which is determined to be a mail header, the first line of which must begin with "From". Indentation is preserved in the output, and input lines with differing indentation are not joined (unless -c is used). fmt can also be used as an in-line text filter for vi(1). The vi command: !}fmt reformats the text between the cursor location and the end of the paragraph. OPTIONS
-c Crown margin mode. Preserve the indentation of the first two lines within a paragraph, and align the left margin of each subsequent line with that of the second line. This is useful for tagged paragraphs. -s Split lines only. Do not join short lines to form longer ones. This prevents sample lines of code, and other such formatted text, from being unduly combined. -w width | -width Fill output lines to up to width columns. OPERANDS
inputfile Input file. ENVIRONMENT VARIABLES
See environ(5) for a description of the LC_CTYPE environment variable that affects the execution of fmt. ATTRIBUTES
See attributes(5) for descriptions of the following attributes: +-----------------------------+-----------------------------+ | ATTRIBUTE TYPE | ATTRIBUTE VALUE | +-----------------------------+-----------------------------+ |Availability |SUNWcsu | +-----------------------------+-----------------------------+ SEE ALSO
nroff(1), vi(1), attributes(5), environ(5) NOTES
The -width option is acceptable for BSD compatibility, but it may go away in future releases. SunOS 5.10 9 May 1997 fmt(1)
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