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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LEARN ABOUT OPENSOLARIS

fmlgrep

fmlgrep(1F)							   FMLI Commands						       fmlgrep(1F)

NAME

       fmlgrep - search a file for a pattern

SYNOPSIS

       fmlgrep [-b] [-c] [-i] [-l] [-n] [-s] [-v]
	    limited_regular_expression [filename]...

DESCRIPTION

       fmlgrep	searches  filename for a pattern and prints all lines that contain that pattern. fmlgrep uses limited regular expressions (expres-
       sions that have string values that use a subset of the possible alphanumeric and special characters) like those described on the  regexp(5)
       manual page to match the patterns. It uses a compact non-deterministic algorithm.

       Be careful when using  FMLI special characters (for instance, $, `, ', ") in limited_regular_expression. It is safest to enclose the entire
       limited_regular_expression in single quotes ' ... '.

       If filename is not specified, fmlgrep assumes standard input. Normally, each line matched is copied to standard output. The  file  name	is
       printed before each line matched if there is more than one input file.

OPTIONS

       The following options are supported:

       -b    Precede  each line by the block number on which it was found. This can be useful in locating block numbers by context (first block is
	     0).

       -c    Print only a count of the lines that contain the pattern.

       -i    Ignore upper/lower case distinction during comparisons.

       -l    Print only the names of files with matching lines, separated by new-lines. Does not repeat the names of files  when  the  pattern	is
	     found more than once.

       -n    Precede each line by its line number in the file (first line is 1).

       -s    Suppress error messages about nonexistent or unreadable files.

       -v    Print all lines except those that contain the pattern.

EXIT STATUS

       The following exit values are returned:

       0    if the pattern is found (that is, TRUE)

       1    if the pattern is not found (that is, FALSE)

       2    if an invalid expression was used or filename is inaccessible

ATTRIBUTES

       See attributes(5) for descriptions of the following attributes:

       +-----------------------------+-----------------------------+
       |      ATTRIBUTE TYPE	     |	    ATTRIBUTE VALUE	   |
       +-----------------------------+-----------------------------+
       |Availability		     |SUNWcsu			   |
       +-----------------------------+-----------------------------+

SEE ALSO

       egrep(1), fgrep(1), fmlcut(1F), grep(1), attributes(5), regexp(5)

NOTES

       Lines are limited to  BUFSIZ characters; longer lines are truncated. BUFSIZ is defined in /usr/include/stdio.h.

       If there is a line with embedded nulls, fmlgrep will only match up to the first null; if it matches, it will print the entire line.

SunOS 5.11							    28 Mar 1995 						       fmlgrep(1F)