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Full Discussion: Extract n-digits from string in perl
Top Forums Shell Programming and Scripting Extract n-digits from string in perl Post 303003080 by james2009 on Thursday 7th of September 2017 11:43:23 AM
Old 09-07-2017
Quote:
Originally Posted by rbatte1
I would suggest using split being saved to an array, then display the appropriate field. Perhaps something like this might help:-
Code:
  my $line = "01/05/2017 10:23:41 [ABCD-22357$0]: file.log.38: database error, MODE=SINGLE, LEVEL=critical, STATE: 01170255 (mode main" ;

  my @tmp_array = split (/ /,$line) ;
  print $tmp_array[9] ;


Does that help?
Robin
Thanks Robin, but i'm looking at a situation where the 8-digit number can appear in another position in the string. In that case it will not always be the 9th element of the array.

---------- Post updated at 10:43 AM ---------- Previous update was at 10:28 AM ----------

Quote:
Originally Posted by durden_tyler
If the 8-digit number is always preceded by the word "STATE:" then you could use regular expressions as well:

Code:
$
$ cat mylog.txt
01/05/2017 10:23:41 [ABCD-22357$0]: file.log.38: database error, MODE=SINGLE, LEVEL=critical, STATE: 01170255 (mode main
$
$ perl -lne 'print $1 if /STATE:\s+(\d+)/' mylog.txt
01170255
$

If it could be preceded by more than word, then specify them all in your regular expression, like so:

Code:
$
$ cat mylog_1.txt
01/05/2017 10:23:41 [ABCD-22357$0]: file.log.38: database error, MODE=SINGLE, LEVEL=critical, STATE: 01170255 (mode main
something else
over here
01/05/2017 10:23:41 [ABCD-22357$0]: file.log.38: database error, MODE=SINGLE, LEVEL=critical, BLAH: 12345678 (mode main
some other stuff
$
$ perl -lne 'print $2 if /(STATE|BLAH):\s+(\d+)/' mylog_1.txt
01170255
12345678
$

How can i do this inside a perl script and not on the command line?
 

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LEARN ABOUT DEBIAN

jfs_fscklog

jfs_fscklog(8)						   Extract/Display JFS fsck Log 					    jfs_fscklog(8)

NAME

       jfs_fscklog - extract a JFS fsck service log into a file and/or format and display the extracted file

SYNOPSIS

       jfs_fscklog [ -d ] [ -e device ] [ -f output.file ] [ -p ] [ -V ]

DESCRIPTION

       jfs_fscklog  with option -e device extracts the contents of either the most recent or immediately prior (specified with option -p) JFS fsck
       service log from the specified device, and writes the output to a file.	The file name may be specified with the -f option, or the  default
       file name is <pwd>fscklog.new.  If the -p option is used, the default file name is <pwd>fscklog.old.

       jfs_fscklog with option -d formats and displays the contents of the extracted file.

       jfs_fscklog with options -d and -e device extracts and displays the JFS fsck service log.

OPTIONS

       -d     Format and display a previously extracted JFS fsck service log.

       -e device
	      Extract  the  JFS fsck service log from device and store it in a file.  (device is the special file name corresponding to the actual
	      device from which the fsck log will be extracted (e.g.  /dev/hdb1 )).

       -f file.name
	      Specify the file name, overriding the default file name.	When used with -e device, file.name specifies the name of  the	file  into
	      which the JFS fsck log will be extracted.  When used with -d, file.name specifies the name of the extracted file whose contents will
	      be formatted and displayed.

	      file.name must be 127 characters or less in length.

	      file.name will be created in the present working directory unless it is fully qualified.

       -p     Extract the prior log (as opposed to the most recent log).

       -V     Print version information and exit (regardless of any other chosen options).

EXAMPLES

	Extract the most recent JFS fsck log on /dev/hda5 into <pwd>fscklog.new:

	      jfs_fscklog -e /dev/hda5

       Extract the most recent JFS fsck log on /dev/hdb3 into /temp/l9651107.log:

	      jfs_fscklog -e /dev/hdb3 -f /temp/l9651107.log

       Display the JFS fsck log that was extracted into /temp/l9651107.log:

	      jfs_fscklog -d -f /temp/l9651107.log

       Extract and display the previous JFS fsck log from /dev/hda8:

	      jfs_fscklog -e /dev/hda8 -d -p

REPORTING BUGS

       If you find a bug in JFS or jfs_fscklog, please report it via the bug tracking system ("Report Bugs" section) of the JFS project web site:
       http://jfs.sourceforge.net/

       Please send as much pertinent information as possible, including any jfs_fscklog error messages and the complete output of running jfs_fsck
       with the -v option on the JFS device.

SEE ALSO

       jfs_fsck(8), jfs_mkfs(8), jfs_tune(8), jfs_logdump(8), jfs_debugfs(8)

AUTHOR

       Barry Arndt  (barndt@us.ibm.com)

       jfs_fscklog is maintained by IBM.
       See the JFS project web site for more details:
       http://jfs.sourceforge.net/

								 October 28, 2002						    jfs_fscklog(8)
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