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Full Discussion: Extracting fixed length number from a text file
Top Forums Shell Programming and Scripting Extracting fixed length number from a text file Post 302994211 by dsid on Monday 20th of March 2017 12:33:02 PM
Old 03-20-2017
@vgersh. awk -F ' ' is for defining delimiters as far as I know, what does your command mean
Code:
awk -F'[][]'

. The next part is the start of the string I got that and I think $NF would be number of fields, but why are you subtracting 1 from it and then printing that out.

@Scrutinizer: true my command did print out numbers more than 23 in length.


Code:
grep  -Eo '\<[0-9]{23}\>' file

the above command should work perfect as square brackets wont be in delimiters always so the awk command wont work in all occasions.

I am kinda confused as to why we are using single quotes in a grep expression. Cos I was reading the other day that single quotes remove any meaning from the special characters. Shouldn't we use double quotes?

Also the fact the you have used <,>. Are they working as a block to extract only 23 digits numbers/characters?

---------- Post updated at 04:33 PM ---------- Previous update was at 04:25 PM ----------

@andy391791

I tweaked your command a bit cos the square brackets may or may not be present in future texts for finding the 23 digit number. The tweak seems to be working fine

Code:
$ echo 'Original presentment record for ARN  24013935350549886999873 not found'|sed -n 's/.*\([0-9]\{23\}\).*/\1/p'
24013935350549886999873
[dsiddiqui@lxserv01 scripts]$ echo 'Original presentment record for ARN  [24013935350549886999873] not found'|sed -n 's/.*\([0-9]\{23\}\).*/\1/p'
24013935350549886999873

but when I increase the length of the 23 digit number and run the command, it just extracts 23 numbered digits from the complete numeric strings and pastes it, which is not the case that I want. I just want to print 23 digits only if present
 

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fmt

fmt(1)							      General Commands Manual							    fmt(1)

NAME

       fmt - format text

SYNOPSIS

       width] [file...]

DESCRIPTION

       The  command is a simple text formatter that fills and joins lines to produce output lines of (up to) the number of characters specified in
       the width option.  The default width is 72.  concatenates the arguments.  If none are given, formats text from the standard input.

       Blank lines are preserved in the output, as is the spacing between words.  does not fill lines beginning with a	period	for  compatibility
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SEE ALSO

       nroff(1), vi(1).

																	    fmt(1)
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