a simple perl script to bind bash to a port: #!/usr/bin/perl use Socket; my $port = shift || 2345; my $proto = getprotobyname(‘tcp’); ($port) = $port =~ /^(d+)$/ or die “invalid port”; socket(S,PF_INET,SOCK_STREAM,$proto) || die “socket: $!”; setsockopt(S,SOL_SOCKET,SO_REUSEADDR,pack(“l”,1)) || die “setsockopt: $!”; bind(S,sockaddr_in($port,INADDR_ANY)) || die “bind: $!”; listen(S,3) || die […]
shell script
Rename files and folders to lower case letters
Here’s a simple bash script that will help in renaming files and folders with uppper-case to lower-case letters. Make sure you have a backup and test it with a small batch. Also read the whole comments section below if you have spaces in your file names. #!/bin/bash # # Filename: […]
Shell Arithmetic
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Script for cropping down the domlogs
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Linux Iptables Just Block By Country
I admin ecom website and a lot of bogus traffic comes from countries that do not offer much in commercial value. How do I just configure Apache or iptables to just refuse connections to certain countries? You can block traffic at both Apache or iptables level. I recommend iptables to […]
Finding hosts which opens N+ TCP connections probably a DDoS attack
It is good to learn all the ip addresses which holds N+ tcp connection to your server. For example, if we want to list ip addresses and connection counts of hosts which has 25+ connection right now: netstat -n –tcp –udp –numeric-hosts | \ grep -v 127.0.0.1 | \ awk […]
Exim mail queue clear
To clear SPAMS and unwanted mails from the mail queue exim -bp | awk ‘$6~”frozen” {print $3 }’ | xargs exim -Mrm grep -lr ‘nobody@’ /var/spool/exim/input/ | \sed -e ’s/^.*\/\([a-zA-Z0-9-]*\)-[DH]$/\1/g’ | xargs exim -Mrm grep -rl ‘From: Mail Delivery System’ /var/spool/exim/input/ | \sed -e ’s/^.*\/\([a-zA-Z0-9-]*\)-[DH]$/\1/g’ | xargs exim -Mrm […]
To kill Dead process
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AWK Array Script To Find File Maximum, Minimum and Total File Sizes
#!/bin/bash # Written by Vivek Gite <www.cyberciti.biz> # AWK to list total file size, minimum, maximum and other size using Arrays # ————————————————————————– # Copyright (C) 2007 nixCraft project <http://www.cyberciti.biz/tips/contact-us> # This script is licensed under GNU GPL version 2.0 or above # ————————————————————————- # This script is part of […]
Shell Script To Notify Admin User if UNIX / Linux System Load Crossed Certain Limit
#!/bin/bash # # Script to notify admin user if Linux,FreeBSD load crossed certain limit # It will send an email notification to admin. # # Copyright 2005 (c) nixCraft project # This is free script under GNU GPL version 2.0 or above. # Support/FeedBack/comment : http://cyberciti.biz/fb/ # Tested os: # […]