Linux Cheatsheet is here just to not waste time when i will try to remember one of these commands.
1. Find all files changed in a certain range of time
To find all files modified on the 26 June, 2015:
1 | $ find /home/user/docs/ -type f -newermt 2015-04-26 ! -newermt 2015-04-27 |
-newermt – modified files
-newerat – accessed files
-newerct – files which had their permission changed
2. Find files containing text
1 | grep --include=\*.php -rnw /home/user/docs/ -e "birthday" |
3. Get a number of files in a directory
1 | ls -1 /home/user/docs/ | wc -l |
4. Delete large number of files
rm does not help in this cause. Usually you will get smth like “/bin/rm: Argument list too long.”
1 | find /home/user/docs/ -type f -delete |
5. Change owner/group of files recursively
1 | sudo chown -R www-data:www-data /home/user/docs/ |
6. Change permission of files recursively
1 | sudo chmod -R 770 /home/user/docs/ |
7. Get folder size
1 | du -hs /path/to/directory |
-h is to get the numbers “human readable”, e.g. get 140M instead of 143260 (size in KBytes)
-s is for summary (otherwise you’ll get not only the size of the folder but also for everything in the folder separately)
8. Find files bigger than 100MB
1 | find . -type f -size +100M |
If you want the current dir only:
1 | find . -maxdepth 1 -type f -size +100M |
9. Working with iptables
add rule to block certain IP
1 | iptables -A INPUT -s xx.xx.xx.xx -j DROP |
insert rule to block IP into first line
1 | iptables -I INPUT 1 -s xx.xx.xx.xx -j DROP |
save current iptables rules to file
1 | iptables-save > ip-tables |
search for blocked IP address
1 | iptables -L INPUT -v -n | grep xx.xx.xx.xx |
list INPUT rules with line numbers
1 | iptables -L INPUT -n --line-numbers |
delete rule on line 3
1 | iptables -D INPUT 3 |
To be updated…