Advise to print lines before and after patterh match and checking and removing duplicate files Post: 303046126

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Top Forums UNIX for Beginners Questions & Answers Advise to print lines before and after patterh match and checking and removing duplicate files Post 303046126 by RudiC on Friday 24th of April 2020 05:18:42 PM

04-24-2020

Registered User

Why check for duplicate files if you can avoid producing them in the first place? Try

Code:

$ touch filesdone
$ awk -vLCNT=10 -vPAT="CORRUPTION DETECTED" '
BEGIN           {LCNT++
                }
FNR == 1        {PR = 0
                 print "^" FILENAME "$" >> "filesdone"
                }
                {T[FNR%LCNT] = $0
                }
$0 ~ PAT        {print ""
                 PR = FNR + LCNT
                 for (i=1; i<LCNT; i++) print T[(FNR+i)%LCNT]
                }
FNR < PR
' $(ls $DIR_PATH/alert_${sid}* | grep -vf filesdone) /dev/null

This little script keeps an LCNT (here: 10) deep cyclic buffer of the lines encountered, and, if the search pattern is matched, prints these buffered LCNT lines, the actual line, and LCNT lines to come. Caveat: if the pattern is encountered again BEFORE the latter have been printed, they will stop, and the cycle starts anew with printing the buffer. You may redirect - immediately in awk itself - the results to individual files belonging to the originals.

The actual file name, when first encountered, adorned with BOL and EOL anchors, is retained in a, say, "control file" and will never be treated again. Feel free to put the "control file" anywhere else. Little drawback: you have to touch the "control file" once before the first run to make sure it exists.
The list of files presented to awk is the lsed directory contents with the "already done files" removed by grep's -v option. The /dev/null empty file serves as a dummy to avoid awk reading from terminal / stdin when no new files exist, and all old files fall victim to this procedure.

Give it a shot and report back.

Last edited by RudiC; 04-24-2020 at 06:25 PM..

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comm

comm(1) 						      General Commands Manual							   comm(1)

NAME

       comm - select or reject lines common to two sorted files

SYNOPSIS

       file1 file2

DESCRIPTION

       comm  reads  file1  and	file2, which should be ordered in increasing collating sequence (see sort(1) and Environment Variables below), and
       produces a three-column output:

	      Column 1:   Lines that appear only in file1,
	      Column 2:   Lines that appear only in file2,
	      Column 3:   Lines that appear in both files.

       If is used for file1 or file2, the standard input is used.

       Options 1, 2, or 3 suppress printing of the corresponding column.  Thus prints only the lines common to the two files; prints only lines in
       the first file but not in the second; does nothing useful.

EXTERNAL INFLUENCES

   Environment Variables
       determines the collating sequence expects from the input files.

       determines the language in which messages are displayed.

       If is not specified in the environment or is set to the empty string, the value of determines the language in which messages are displayed.
       If is not specified in the environment or is set to the empty string, the value of is used as a default.  If is not specified or is set	to
       the  empty  string,  a  default of ``C'' (see lang(5)) is used instead of If any internationalization variable contains an invalid setting,
       behaves as if all internationalization variables are set to ``C''.  See environ(5).

   International Code Set Support
       Single- and multi-byte character code sets are supported.

EXAMPLES

       The following examples assume that and have been ordered in the collating sequence defined by the or environment variable.

       Print all lines common to and (in other words, print column 3):

       Print all lines that appear in but not in (in other words, print column 1):

       Print all lines that appear in but not in (in other words, print column 2):

SEE ALSO

       cmp(1), diff(1), sdiff(1), sort(1), uniq(1).

STANDARDS CONFORMANCE

																	   comm(1)