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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 302994208 by Scrutinizer on Monday 20th of March 2017 11:58:32 AM
Old 03-20-2017
Hi that command will extract all 23 digit numbers from the text. The -o option is a GNU and BSD grep extension.

You do not need the perl extension.
Code:
grep  -Eo "[0-9]{23}" file

should work as well

The problem with this command is that it will also return part of numbers that are larger than 23 digits if present..

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

An equivalent awk command would be:
Code:
awk '$1~/^[0-9]{23}$/{print $1}' RS=\[ FS=\] file


---
( grep -Eo '\<\d{23}\>' file will also work with BSD grep )
This User Gave Thanks to Scrutinizer For This Post:
dsid
 

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LEARN ABOUT MINIX

zgrep

ZGREP(1)                                                      General Commands Manual                                                     ZGREP(1)

NAME

       zgrep - search possibly compressed files for a regular expression

SYNOPSIS

       zgrep [ grep_options ] [ -e ] pattern filename...

DESCRIPTION

       Zgrep  invokes  grep  on  compressed  or  gzipped  files.   These  grep  options  will  cause  zgrep  to  terminate  with  an  error  code:
       (-[drRzZ]|--di*|--exc*|--inc*|--rec*|--nu*).  All other options specified are passed directly to grep.  If no file is specified,  then  the
       standard input is decompressed if necessary and fed to grep.  Otherwise the given files are uncompressed if necessary and fed to grep.

       If the GREP environment variable is set, zgrep uses it as the grep program to be invoked.

EXIT CODE

       2 - An option that is not supported was specified.

AUTHOR

       Charles Levert (charles@comm.polymtl.ca)

SEE ALSO

       grep(1), gzexe(1), gzip(1), zdiff(1), zforce(1), zmore(1), znew(1)

                                                                                                                                          ZGREP(1)
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