CXS shell command

/usr/sbin/cxs --allusers --baction high --bayes --breport medium --clamdsock /var/run/clamav/clamd.sock --deep --defapache nobody --doptions Mv --exploitscan --nofallback --filemax 10000 --noforce --html --ignore /etc/cxs/cxs.ignore --logfile /var/log/cxs.log --mail epoch23@gmail.com --options mMOLfSGchexdnwZRD --qoptions MBhv --quiet --report /var/log/cxs.scan --sizemax 1000000 --ssl --summary --sversionscan --timemax 30 --nounofficial --virusscan --voptions mfuhexT --Wmaxchild 3 --Wnotify inotify --Wrateignore 0 --Wrefresh 7 --Wsleep 3 --Wstart

Create new png files from jpg files recursively

find . -name "*.jpg" -exec mogrify -format png {} \;

Create webp files recursively from png files

find . -name "*.png" | parallel -eta cwebp {} -o {.}.webp

KILL a user session from root where ### is the user id

skill -KILL -t pts/###

Check the most recently modified file through shell

find /home/username/public_html/ -mtime 0

Speed Test - change test10.zip to test500.zip to test with a 500MB file

wget -O /dev/null https://dl.vanhoutte.be/cdn/1GB.bin

Detect possible hacker ssh shells running

ps ax | grep "ssh" | grep -v "grep"

Replace all occurrences of <string1> with <string2> for files in <mydir> recursively

find <mydir> -type f -exec sed -i 's/<string1>/<string2>/g' {} +

Append to files recursively

find . -type f -exec bash -c 'echo "append this" >> "{}"' \;

Find files named error_log and delete them all

find . -name error_log -delete #

Replace all occurrences within all php files in the same directory

sed -i 's///g' *php

Replace all occurrences within all html files in the same directory

sed -i "s###g" *html

Scan files within a directory for matching text

grep -rl 'text to match here' .

Check a port for what it belongs to, good for checking for backdoors

fuser -vn tcp 1337

List all directory and filesizes

du --max-depth=1 | sort -n | awk 'BEGIN {OFMT = "%.0f"} {print $1/1024,"MB", $2}'

List top 10 biggest files in directory

du -a /var | sort -n -r | head -n 10

Find and print the top 10 largest files names (not directories) in a particular directory and its sub directories

find . -printf '%s %p\n'|sort -nr|head

Delete unread emails from server

find -P /home/epoch/mail/*/*/new -mindepth 1 -maxdepth 1 -mtime '+400' -delete

Delete read emails from server

find -P /home/epoch/mail/*/*/cur -mindepth 1 -maxdepth 1 -mtime '+400' -delete

Check bandwidth usage per connection

iftop -i eth1

Find and sort top 10 largest MYSQL database tables (do this from phpmyadmin SQL tab)

SELECT CONCAT(table_schema, '.', table_name),
CONCAT(ROUND(table_rows / 1000000, 2), 'M') rows,
CONCAT(ROUND(data_length / ( 1024 * 1024 * 1024 ), 2), 'G') DATA,
CONCAT(ROUND(index_length / ( 1024 * 1024 * 1024 ), 2), 'G') idx,
CONCAT(ROUND(( data_length + index_length ) / ( 1024 * 1024 * 1024 ), 2), 'G') total_size,
ROUND(index_length / data_length, 2) idxfrac
FROM information_schema.TABLES
ORDER BY data_length + index_length DESC
LIMIT 10;

Repair & Optimize all MYSQL databases

mysqlcheck -u root --auto-repair --optimize --all-databases

Dump all MYSQL databases & tables to a file

mysqldump -uroot --all-databases > alldb.sql

Load MYSQL databases & tables from a file

mysql -u root -p < alldb.sql

Recursively Optimize PNG Files

find -name '*.png' -print0 | xargs -0 optipng -nc -nb -o7

for file in `find -name '*.png'`; do pngcrush -reduce -brute $file /usr/local/src/crushed.png; mv /usr/local/src/crushed.png $file; done

BASH script to execute actions on multiple files

#!/bin/sh
for png in `find $1 -name "*.png"`;
do
echo "crushing $png"
pngcrush -brute "$png" temp.png
mv -f temp.png $png
done;

CHANGE ALL FOLDER PERMISSIONS RECURSIVELY

find /home/*/public_html -type d -exec chmod 755 {} \;

CHANGE ALL FILE PERMISSIONS RECURSIVELY

find /home/*/public_html -type f -exec chmod 644 {} \;