03-11-2008
It's because it's subtracting one number from the other. The subtraction you're doing has no concept of dates.
There are many ways to go about this. What exactly are you trying to do?
A couple of possibilities:
A find command using the -mtime and -exec options (you can search for all files over 30 days old and do something to them).
A short script which returns the difference in days between a file's last-modified time and the current system time, to be embedded in your script.
As usual, providing as much information as possible will get you the best results. Also, try searching this site -- your question has probably been answered many times. It depends on exactly what you're trying to do.
ShawnMilo
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FIND(1) General Commands Manual FIND(1)
NAME
find - find files meeting a given condition
SYNOPSIS
find directory expression
EXAMPLES
find / -name a.out -print
# Print all a.out paths
find /usr/ast ! -newer f -ok rm {} ;
# Ask before removing
find /usr -size +20 -exec mv {} /big ;
# move files > 20 blks
find / -name a.out -o -name '*.o' -exec rm {};
# 2 conds
DESCRIPTION
Find descends the file tree starting at the given directory checking each file in that directory and its subdirectories against a predi-
cate. If the predicate is true, an action is taken. The predicates may be connected by -a (Boolean and), -o (Boolean or) and ! (Boolean
negation). Each predicate is true under the conditions specified below. The integer n may also be +n to mean any value greater than n, -n
to mean any value less than n, or just n for exactly n.
-name s true if current filename is s (include shell wild cards)
-size n true if file size is n blocks
-inum n true if the current file's i-node number is n
-mtime ntrue if modification time relative to today (in days) is n
-links ntrue if the number of links to the file is n
-newer ftrue if the file is newer than f
-perm n true if the file's permission bits = n (n is in octal)
-user u true if the uid = u (a numerical value, not a login name)
-group gtrue if the gid = g (a numerical value, not a group name)
-type x where x is bcdfug (block, char, dir, regular file, setuid, setgid)
-xdev do not cross devices to search mounted file systems
Following the expression can be one of the following, telling what to do when a file is found:
-print print the file name on standard output
-exec execute a MINIX command, {} stands for the file name
-ok prompts before executing the command
SEE ALSO
test(1), xargs(1).
FIND(1)