recursively find files by date time
handle files with spaces and other problem characters with null char
recursively find and search / grep files
recursively find *.LCK files for the current user list them and then remove them

find by hours

$ find . -atime -7 -exec ls -l {} \; # (a)ccessed in the last week
$ find . -ctime +31 -exec ls -l {} \; # "file status" (c)hanged more than a month ago
$ find . -mtime +1090 -exec ls -l {} \; # (m)odified more than 3 years ago

find by minutes

$ find . -amin -15 -exec ls -l {} \; # (a)ccessed in the last qtr hour
$ find . -cmin +30 -exec ls -l {} \; # "file status" (c)hanged more than half an hour ago

$ touch x.x # set date(s) of x.x to "now"

find by date of existing file

$ find . -anewer x.x # (a)ccessed after x.x/now
$ find . -cnewer x.x # "file status" (c)hanged after x.x/now
$ find . -newer x.x # newer/modified after x.x/now

numeric time arguments

N exactly N hours/mins ago (not very useful !)
+N more than N hours/days ago
-N less than / up to N hours/mins

find by +/- hours

$ find . -atime -7 -exec ls -l {} \; # (a)ccessed in the last 7 days
$ find . -ctime +7 -exec ls -l {} \; # "file status" (c)hanged more than last 7 days ago
$ find . -mtime +14 -exec ls -l {} \; # (m)odified more than last 2 weeks ago

find by +/- mins

$ find . -amin -45 -exec ls -l {} \; # (a)ccessed in the last 45 mins
$ find . -cmin +45 -exec ls -l {} \; # "file status" (c)hanged more than 45 mins ago
$ find . -mmin +45 -exec ls -l {} \; # (m)odified more than 45 mins ago
handle files with spaces and other problem characters with null char)
$ find . -name "a*" -print0 > filelist

find & ls & rm

Find *.LCK files for the current user list them and then remove them

find modified

(m)odified over a year ago
(m)odified in the last 30 mins

find

find changed

(c)hanged over a year ago
(c)hanged in the last 30 mins
$ find . -cmin -30 -exec ls -l {} \;

find names

find accessed

(a)ccessed over 30 mins ago
$ find . -amin +30 -exec ls -l {} \;

find & grep

find ls rm

Find grep
$ find . -name "*.php" -exec grep -H <searchstring> {} \;
Find LCK files for the current user list them and then remove them
$ find . -user $USER -name "*.LCK" -exec ls -lG {} \;
$ find . -user $USER -name "*.LCK" -exec rm {} \;

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REFERRERS
GnuCoreUtils
GnuTextUtils

GNU Find

http://www.gnu.org/software/findutils/manual/html_mono/find.html∞

Find (files with spaces and other problem characters)
$ find . -name a* -print0 > filelist

Find (and ls (a)ccessed over 30 mins ago)
Find (and recursive grep)

$ find . -ctime +365 -exec ls -l {} \;

$ find . -cmin +30 -exec ls -l {} \;

$ find . -name "*.php" -exec grep -H user_ip {} \;