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How can I Get a list of all files modified , say 3 months ago. I checked this question but I was not able to apply it to my scenario. I am trying this now , it seems to be working , but I know there should be a better way using find.
ls -ltR | grep -v '2011-05' | grep -v '2011-06' | grep -v '2011-07' | grep -v '2011-08
One solution is: find . -type f -mtime 90
That finds files that was last modified 90 days ago (in those 24 hours that started 91 x 24 hours ago and ended 90 x 24 hours ago).
find . -type f -mtime -90 finds files that were modified in the last 90 days (or in the future).
find . -type f -mtime +90 finds files that were modified at least 91 days ago (at least in POSIX compliant find implementations).
As @hknik says, the -mtime operation on find is likely your best bet, but if you want to get all files around three months ago, then you need a bigger net:
find . -type f -mtime -105 -mtime +76
This will find the regular files in the month surrounding three months ago, between 11 and 15 weeks ago.
(note the 76 instead of 7 x 11 = 77, as you want files whose age rounded down to an integer number of days is strictly greater than 76 to get files that are at least 77 days (11 weeks) old).
With zsh and (.m[-|+]n) glob-qualifiers:
print -rl -- *(.m90)
will list files modified 90 days ago (in those 24 hours that started 91 x 24 hours ago and ended 90 x 24 hours ago like with POSIX find -mtime 90).
print -rl -- *(.m-90)
will list files modified in the last 90 days (or in the future),
print -rl -- *(.m-100m+90)
will list files modified between 91 and 100 days ago.
You can use "3 months ago" directly with the "newerXY" syntax:
find . -maxdepth 2 -xdev -type f -newermt '3 months ago'
(I added maxdepth and xdev to limit the search)
With these relative dates minutes, hours, days, weeks and months can be used.
"m" stands for modification time, "t" means direct time (and not the date of a reference file).
Or by combining two absolute dates to choose a time span; here from Jan 1 to Jan 15:
#] find . -maxdepth 2 -newermt 'Jan 1' ! -newermt 'Jan 15' -ls
415640 4 -rw-r--r-- 1 root root 2190 Jan 8 15:14 ./df.man
412465 4 -rw-r--r-- 1 root root 98 Jan 1 2020 ./ranfunc
412282 4 -rw------- 1 root root 23 Jan 13 16:53 ./.python_history
406542 0 lrwxrwxrwx 1 root root 56 Jan 8 19:46 ./.fvwm/.BGdefault -> /usr/share/fvwm/default-config/images/background/bg3.png
417900 28 -rw-r--r-- 1 root root 25990 Jan 3 09:48 ./xterm.2020.01.03.09.48.03.xhtml