Find out if file has been modified within the last 2 minutes

问题

In a bash script I want to check if a file has been changed within the last 2 minutes.

I already found out that I can access the date of the last modification with stat file.ext -c %y. How can I check if this date is older than two minutes?

回答1:

I think this would be helpful,

find . -mmin -2 -type f -print

also,

find / -fstype local -mmin -2

回答2:

Complete script to do what you're after:

#!/bin/sh

# Input file
FILE=/tmp/test.txt
# How many seconds before file is deemed "older"
OLDTIME=120
# Get current and file times
CURTIME=$(date +%s)
FILETIME=$(stat $FILE -c %Y)
TIMEDIFF=$(expr $CURTIME - $FILETIME)

# Check if file older
if [ $TIMEDIFF -gt $OLDTIME ]; then
   echo "File is older, do stuff here"
fi

If you're on macOS, use stat -t %s -f %m $FILE for FILETIME, as in a comment by Alcanzar.

回答3:

I solved the problem this way: get the current date and last modified date of the file (both in unix timestamp format). Subtract the modified date from the current date and divide the result by 60 (to convert it to minutes).

expr $(expr $(date +%s) - $(stat mail1.txt -c %Y)) / 60

Maybe this is not the cleanest solution, but it works great.

回答4:

Here is how I would do it: (I would use a proper temp file)

touch -d"-2min" .tmp
[ "$file" -nt .tmp ] && echo "file is less than 2 minutes old"

回答5:

here's an even simpler version that uses shell math over expr:

SECONDS (for idea)

echo $(( $(date +%s) - $(stat file.txt  -c %Y) ))

MINUTES (for answer)

echo $(( ($(date +%s) - $(stat file.txt  -c %Y) / 60 ))

回答6:

Here is a solution that will test if a file is older than X seconds. It doesn't use stat, which has platform-specific syntax, or find which doesn't have granularity finer than 1 minute.

interval_in_seconds=10
filetime=$(date -r "$filepath" +"%s")
now=$(date +"%s")
timediff=$(expr $now - $filetime)
if [ $timediff -ge $interval_in_seconds ]; then
  echo ""
fi

来源：https://stackoverflow.com/questions/28337961/find-out-if-file-has-been-modified-within-the-last-2-minutes

标签

Linux

bash

unix