Slightly OT, .. selecting files by mtime as YYMM

[L V Lammert (Omnitec Corp)]

This group has some of the best bash folks I know, and it seemed like a good place to post the question:

I need to select files in a directory based on a "YYMM" criteria - i.e. YYMM01 < mtime < YYMM31 [or month end].

I can envision the expansion of YYMM to YYMM01, but i am at a loss for a way to handle the variable YYMM<end>.

Any thoughts would be appreciated!

    Thanks!

    Lee

[Bob Ernst]

Leaning heavily on the date command:
    date --date="130501 next month yesterday" +%y%m%d

gives the result
    130531

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[Don Ellis]

Looks like that's a GNU version of date, not the BSD version, which gives:

1 (501) $  date --date="130501 next month yesterday" +%y%m%d

date: illegal option -- -

usage: date [-jnu] [-d dst] [-r seconds] [-t west] [-v[+|-]val[ymwdHMS]] ... 

            [-f fmt date | [[[mm]dd]HH]MM[[cc]yy][.ss]] [+format]

I'll be looking at other sources for the date command; brew doesn't list it under that name. Found find under findutils. [Later: found it in coreutils package - will brew install that and try it again.]

--Don Ellis

[Bob Ernst]

Yes, I was using the GNU date command. Here is a more painful bash alternative starting with a four-digit year and the month.

#!/bin/bash
YEAR=2013
MONTH=5
days=(0 31 28 31 30 31 30 31 31 30 31 30 31)
lastday=${days[$MONTH]}

if [ $MONTH -eq 2 ]; then
    if [ $((YEAR % 4)) -ne 0 ] ; then

        : # still 28

    elif [ $((YEAR % 400)) -eq 0 ] ; then
        lastday=29
    elif [ $((YEAR % 100)) -eq 0 ] ; then

        : # still 28

    else
        lastday=29
    fi
fi
echo "The last day of the month is $YEAR-$MONTH-$lastday"

[Nathan Neff]

I would just get the year month from YYMM and then find files whose

mtime had that month, and not worry about the 29 vs. 30 vs. 31

the "stat" command will give you the mtime

stat -c '%y' some-file

2013-05-21 23:23:10.529603934 -0400

If I needed 1305, I would stat every file like above and only select lines/files

that started with 2013-05