On 2013-02-13 12:27, Tim Daneliuk <tun...@tundraware.com> wrote: > I know how to do this in Python, but I really want to do it in > straight Bourne shell. I have some ideas, but I thought I'd > give you folks a crack at this Big Fun: > > a) You have a directory of files - say they're logs - generated > at nondeterministic intervals. You may get more than one a day, > more than one a month, none, or hundreds. > > b) To conserve space, you want to keep the last file generated > in any given month (the archive goes back for an unspecified > number of years), and delete all the files generated prior to > that last file in that same month. > > c) Bonus points if the problem is solved generally for either files > or directories generated as described above. > > These are not actually logs, and no, I don't think logrotate can > do this ... or can it?
You can try using stat/date to print the month in which each file was modified, e.g: freefall:/home/keramida$ stat -f '%m %N' prs.tar.bz2 1359910210 prs.tar.bz2 freefall:/home/keramida$ date -f '%s' -j '1359910210' '+%Y-%m' 2013-02 Having the mtime of the file in seconds since the epoch (1359910210) should be easy to sort through, e.g. you can find the last modification time with a 'sort -n | tail -1' pipe: freefall:/home/keramida/w/doc-head/el_GR.ISO8859-7/share$ touch xml/glossary.ent freefall:/home/keramida/w/doc-head/el_GR.ISO8859-7/share$ find xml -exec stat -f '%m %N' {} + 1360060289 xml 1360060288 xml/navibar.l10n.ent 1360060288 xml/trademarks.ent 1360060288 xml/libcommon.xsl 1360060288 xml/header.l10n.ent => 1360942284 xml/glossary.ent 1360060289 xml/freebsd.dsl 1360060289 xml/teams.ent 1360060289 xml/freebsd.ent 1360060289 xml/l10n.ent 1360060289 xml/mailing-lists.ent 1360060289 xml/newsgroups.ent 1360060289 xml/translators.ent 1360060289 xml/catalog.xml 1360060289 xml/entities.ent 1360060289 xml/catalog 1360060289 xml/urls.ent freefall:/home/keramida/w/doc-head/el_GR.ISO8859-7/share$ find xml -exec stat -f '%m %N' {} + | sort -n | tail -1 1360942284 xml/glossary.ent Then you can convert the epoch-based times to '%Y-%m' timestamps in a loop, e.g.: freefall:/home/keramida/w/doc-head/el_GR.ISO8859-7/share$ find xml \ > -exec stat -f '%m %N' {} + | while read mtime fname ; do > echo ${mtime} $( date -f '%s' -j "${mtime}" '+%Y-%m' ) ${fname} > done 1360060289 2013-02 xml 1360060288 2013-02 xml/navibar.l10n.ent 1360060288 2013-02 xml/trademarks.ent 1360060288 2013-02 xml/libcommon.xsl 1360060288 2013-02 xml/header.l10n.ent 1360942284 2013-02 xml/glossary.ent 1360060289 2013-02 xml/freebsd.dsl 1360060289 2013-02 xml/teams.ent 1360060289 2013-02 xml/freebsd.ent 1360060289 2013-02 xml/l10n.ent 1360060289 2013-02 xml/mailing-lists.ent 1360060289 2013-02 xml/newsgroups.ent 1360060289 2013-02 xml/translators.ent 1360060289 2013-02 xml/catalog.xml 1360060289 2013-02 xml/entities.ent 1360060289 2013-02 xml/catalog 1360060289 2013-02 xml/urls.ent Having the mtime in seconds as the first column is still conducive to sorting / tail: freefall:/home/keramida/w/doc-head/el_GR.ISO8859-7/share$ find xml \ > -exec stat -f '%m %N' {} + | while read mtime fname ; do > echo ${mtime} $( date -f '%s' -j "${mtime}" '+%Y-%m' ) ${fname}; > done | sort -n | tail -1 1360942284 2013-02 xml/glossary.ent >From that point it should be trivial to select all files whose timestamp is smaller than or equal to 1360942284 - one month of seconds. _______________________________________________ freebsd-questions@freebsd.org mailing list http://lists.freebsd.org/mailman/listinfo/freebsd-questions To unsubscribe, send any mail to "freebsd-questions-unsubscr...@freebsd.org"