Commands tagged scanner (7)

  • Simple one-liner for scanning a range of hosts, you can also scan a range of ports with Netcat by ex.: nc -v -n -z -w 1 192.168.0.1 21-443 Useful when Nmap is not available:) Range declaration like X..X "for i in {21..29}" is only works with bash 3.0+ Show Sample Output


    9
    for i in {21..29}; do nc -v -n -z -w 1 192.168.0.$i 443; done
    rez0r · 2009-09-25 03:31:29 3
  • Joins two pdf documents coming from a simplex document feed scanner. Needs pdftk >1.44 w/ shuffle.


    5
    pdftk A=odd.pdf B=even.pdf shuffle A1-end Bend-1S output duplex.pdf
    till · 2011-02-25 15:00:09 2
  • Very handy way to perform a host scan if you don't have nmap,ncat,nc ...or other tools installed locally. When executing a command on a /dev/tcp/$host/$port pseudo-device file, Bash opens a TCP connection to the associated socket and UDP connection when using /dev/udp/$host/$port.A simlpe way to get servers banner is to run this command "cat < /dev/tcp/localhost/25" , here you will get mail server's banner. NOTE: Bash, as packaged for Debian, does not support using the /dev/tcp and /dev/udp pseudo-device it's not enabled by default Because bash in Debian is compiled with ?disable-net-redirections. Show Sample Output


    4
    for p in {1..1023}; do(echo >/dev/tcp/localhost/$p) >/dev/null 2>&1 && echo "$p open"; done
    benyounes · 2010-04-26 18:09:22 1
  • Xsane produces PDFs that are too large - particularly multipage PDFs. This command compresses them. If you do not use A4, remove the -sPAPERSIZE flag.


    3
    gs -q -sPAPERSIZE=a4 -dNOPAUSE -dBATCH -sDEVICE=pdfwrite -sOutputFile=test.pdf multipageproject.pdf
    iain · 2009-03-24 17:14:46 1
  • Adjust the --resolution and --mode as required (if these options are available for your scanner). The size options (-x, -y, -imageheight, -imagewidth) are for US letter paper. For A4, I think the command would be: scanimage -p --resolution 250 --mode Gray -x 210 -y 297 | pnmtops -imageheight 11.7 -imagewidth 8.3 | ps2pdf - output.pdf


    3
    scanimage -p --resolution 250 --mode Gray -x 215.9 -y 279.4 | pnmtops -imageheight 11 -imagewidth 8.5 | ps2pdf - output.pdf
    dbh · 2013-04-12 18:18:42 0
  • use imagemagik convert


    2
    convert -compress jpeg *.jpg mydoc.pdf
    hute37 · 2011-05-01 13:37:09 0
  • Does a ping scan on the local subnet and returns the IPs that are up Show Sample Output


    0
    nmap -T4 -sn 192.168.1.0/24
    drewbled · 2012-06-19 17:07:24 0

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leave a stale ssh session
When your ssh session hanged (probably due to some network issues) you can "kill" it by hitting those 3 keys instead of closing the entire terminal.

Show apps that use internet connection at the moment. (Multi-Language)
for one line per process: $ ss -p | cat for established sockets only: $ ss -p | grep STA for just process names: $ ss -p | cut -f2 -sd\" or $ ss -p | grep STA | cut -f2 -d\"

Create a DOS floppy image
mount with: mount -t msdos -o loop ./floppy.img /tmp/mnt

Securely destroy data (including whole hard disks)
GNU shred is provided by the coreutils package on most Linux distribution (meaning, you probably have it installed already), and is capable of wiping a device to DoD standards. You can give shred any file to destroy, be it your shell history or a block device file (/dev/hdX, for IDE hard drive X, for example). Shred will overwrite the target 25 times by default, but 3 is enough to prevent most recovery, and 7 passes is enough for the US Department of Defense. Use the -n flag to specify the number of passes, and man shred for even more secure erasing fun. Note that shredding your shell history may not be terribly effective on devices with journaling filesystems, RAID copies or snapshot copies, but if you're wiping a single disk, none of that is a concern. Also, it takes quite a while :)

share internet connection with only one network interface
the below command create a alias for share your internet connection with another. $ifconfig eth0:1 192.168.0.1/24 Its obviously necessary too activate the iptables post-routing and ip forwarding, as root: $modprobe iptable_nat $iptables -t nat -A POSTROUTING -o eth0 -j MASQUERADE $echo 1 > /proc/sys/net/ipv4/ip_forward Be sure that the alias 192.168.0.0/24 is not your active real ip range

print text in color red
eg: $printTextInColorRed foo bar foo bar [in red color]

Compress files found with find
tar options may change ;) c to compress into a tar file, z for gzip (j for bzip) man tar -print0 and -0t are usefull for names with spaces, \, etc.

Play musical notes from octave of middle C
Are there any creative pieces of music that can be created using beep and the shell? I'd love to hear it!

Convert mp3/wav file to asterisk ulaw for music on hold (moh)

Install pip with Proxy
Installs pip packages defining a proxy


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