Delete Old files from Tar Post: 303045288

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Top Forums UNIX for Beginners Questions & Answers Delete Old files from Tar Post 303045288 by RudiC on Sunday 15th of March 2020 04:44:09 PM

03-15-2020

Registered User

This MAY work to identify the target files. It produces an archive listing in long format including the date/time stamps, which ($4,$5) then are printed to stdout and a pipe, and, in parallel, the line No. and file name to a temporary file to be used later. On the other end of the pipe, date converts all the time stamps to epoch seconds, then piped into the next awk that compares them to the target threshold, i.e. the date/time 7 days ago. If condition is met, the line No. is retained in an array, and then used to identify the relevant lines in the temp file. Identified file names are printed and piped into tar to be used as the file for the -T option.
The --delete option won't work on compressed files, though, as stated before.

Be aware that the construct may suffer from race conditions, if the temp file is not on time available for reading in the last step. You might split the loooong pipe chain into separate steps, then.

Code:

tar tvf file.Tar.gz |
awk '
        {print $4,$5
         $1 = $2 = $3 = $4 = $5 = ""
         print NR, $0 > "/tmp/XYZ"
        }
' |
date -f- +%s |
awk '
BEGIN           {DT = srand() - 7 * 86400
                }
FNR == NR &&
$1 < DT         {T[NR]
                 next
                }
$1 in T         {print $2
                }
' - /tmp/XYZ |
tar tvf file.Tar.gz -T-

Last edited by RudiC; 03-15-2020 at 05:54 PM..

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LEARN ABOUT PLAN9

tar

TAR(1)							      General Commands Manual							    TAR(1)

NAME

       tar - archiver

SYNOPSIS

       tar key [ file ...  ]

DESCRIPTION

       Tar  saves  and	restores  file trees.  It is most often used to transport a tree of files from one system to another.  The key is a string
       that contains at most one function letter plus optional modifiers.  Other arguments to the command are names of files or directories to	be
       dumped or restored.  A directory name implies all the contained files and subdirectories (recursively).

       The function is one of the following letters:

       c      Create a new archive with the given files as contents.

       x      Extract  the named files from the archive.  If a file is a directory, the directory is extracted recursively.  Modes are restored if
	      possible.  If no file argument is given, extract the entire archive.  If the archive contains multiple entries for a file, the  lat-
	      est one wins.

       t      List all occurrences of each file in the archive, or of all files if there are no file arguments.

       r      The named files are appended to the archive.

       The modifiers are:

       v      (verbose) Print the name of each file treated preceded by the function letter.  With t, give more details about the archive entries.

       f      Use  the	next  argument as the name of the archive instead of the default standard input (for keys x and t) or standard output (for
	      keys c and r).

       u      Use the next (numeric) argument as the user id for files in the output archive.  This is only useful when moving files to a non-Plan
	      9 system.

       g      Use the next (numeric) argument as the group id for files in the output archive.

EXAMPLES

       Tar can be used to copy hierarchies thus:

	      {cd fromdir; tar c .} | {cd todir; tar x}

SOURCE

       /sys/src/cmd/tar.c

SEE ALSO

       ar(1), bundle(1), tapefs(1)

BUGS

       There is no way to ask for any but the last occurrence of a file.
       File path names are limited to 100 characters.
       The tar format allows specification of links and symbolic links, concepts foreign to Plan 9: they are ignored.

																	    TAR(1)

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