Change ./ to the root directory you wish to search in. Change -7 to +7 for files changed more than a week ago.
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find ./ -mtime -7 -print
-mtime n[smhdw]
If no units are specified, this primary evaluates to true if the difference between the file last modification time and the time find was started, rounded up to the next full 24-hour period, is n 24-hour periods.
If units are specified, this primary evaluates to true if the difference between the file last modification time and the time find was started is exactly n units.
Please refer to the -atime primary description for information on supported time units.
-atime n[smhdw]
If no units are specified, this primary evaluates to true if the difference between the file last access time and the time find was started, rounded up to the nextfull 24-hour period, is n 24-hour periods.
If units are specified, this primary evaluates to true if the difference between the file last access time and the time find was started is exactly n units. Possible time units are as follows:
s second
m minute (60 seconds)
h hour (60 minutes)
d day (24 hours)
w week (7 days)
Any number of units may be combined in one -atime argument, for example, “-atime -1h30m”. Units are probably only useful when used in conjunction with the + or – modifier.