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Full Discussion: Delete Old files from Tar
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
Old 03-15-2020
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..
This User Gave Thanks to RudiC For This Post:
 

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DATE(1) 						      General Commands Manual							   DATE(1)

NAME
date - print or set the date and time SYNOPSIS
date [-qsu] [[MMDDYY]hhmm[ss]] [+format] OPTIONS
-q Read the date from stdin -s Set the time (implicit for -q or a date string) -u Print the date as GMT -t Use this number of seconds instead of current time EXAMPLES
date # Print the date and time date 0221921610 # Set date to Feb 21, 1992 at 4:10 p.m. DESCRIPTION
With the -q flag or a numeric argument, date sets the GMT time and date. MMDDYY refers to the month, day, and year; hhmmss refers to the hour, minute and second. Each of the six fields must be exactly two digits, no more and no less. date always display the date and time, with the default format for the system. The -u flag request GMT time instead of local time. A format may be specified with a + followed by a printf-like string with the following options: %% % character %A Name of the day %B Name of the month %D mm/dd/yy %H Decimal hour on 2 digits %I Decimal hour modulo 12 on 2 digits %M Decimal minute on 2 digits %S Decimal seconds on 2 digits %T HH:MM:SS %U Decimal week number, Sunday being first day of week %W Decimal week number, Monday being first day of week %X Same as %T %Y Decimal year on 4 digits %Z Time Zone (if any) %a Abbreviated name of the day %b Abbreviated name of the month %c Appropriate date & time (default format) %d Decimal day of the month on 2 digits %e Same as %d, but a space replaces leading 0 %h Same as %b %j Decimal dey of the year on 3 digits %m Decimal month on 2 digits %n Newline character %p AM or PM %r 12-hour clock time with AM/PM %s Number of seconds since the epoch %t Tab character %w Decimal day of the week (0=Sunday) %x Same as %D %y Decimal year on 2 digits SEE ALSO
time(2), ctime(3), readclock(8). DATE(1)
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