Commands tagged passphrase (7)

  • Create strong, but easy to remember password

    Why remember? Generate! Up to 48 chars, works on any unix-like system (NB: BSD use md5 instead of md5sum) Show Sample Output


    23
    read -s pass; echo $pass | md5sum | base64 | cut -c -16
    bugmenot · 2011-11-24 20:23:47 20
  • Bitcoin Brainwallet Private Key Calculator

    A bitcoin "brainwallet" is a secret passphrase you carry in the "wallet" of your brain. The Bitcoin Brainwallet Private Key Calculator calculates the standard base58 encoded bitcoin private key from your "brainwallet" passphrase. The private key is the most important bitcoin number. All other numbers can be derived from it. This command uses 3 other functions - all 3 are defined on my user page: 1) brainwallet_exponent() - search for Bitcoin Brainwallet Exponent Calculator 2) brainwallet_checksum() - search for Bitcoin Brainwallet Exponent Calculator 3) b58encode() - search for Bitcoin Brainwallet Base58 Encoder Do make sure you use really strong, unpredictable passphrases (30+ characters)! http:brainwallet.org can be used to check the accuracy of this calculator. Show Sample Output


    7
    (read -r passphrase; b58encode 80$( brainwallet_exponent "$passphrase" )$( brainwallet_checksum "$passphrase" ))
    nixnax · 2014-02-18 02:50:09 14
  • Generate an XKCD #936 style 4 word passphrase (fast)

    Some snippets posted are slow on big dictionaries, this one is fast. Show Sample Output


    1
    echo $(shuf -n4 /usr/share/dict/words)
    bohwaz · 2011-08-30 03:10:06 8
  • Generate an XKCD #936 style 4 word passphrase (fast)

    This restricts things 3 ways: 1. No capitalized words, hence no proper names. 2. No apostrophes. 3. Restricts size to range (3,7) Show Sample Output


    1
    echo $(grep "^[^'A-Z]\{3,7\}$" /usr/share/dict/words|shuf -n4)
    cbbrowne · 2011-09-07 22:03:45 3
  • Bash scripts encryption and passphrase-protection

    This function will encrypt a bash script and will only execute it after providing the passphrase. Requires mcrypt to be installed on the system. Show Sample Output


    1
    scrypt(){ [ -n "$1" ]&&{ echo '. <(echo "$(tail -n+2 $0|base64 -d|mcrypt -dq)"); exit;'>$1.scrypt;cat $1|mcrypt|base64 >>$1.scrypt;chmod +x $1.scrypt;};}
    rodolfoap · 2017-06-14 16:27:20 20
  • Bitcoin Brainwallet Private Key Calculator


    0
    $ bitgen hex 12312381273918273128937128912c3b1293cb712938cb12983cb192cb1289b3 info
    Label10 · 2019-03-27 21:25:29 45
  • Bitcoin Brainwallet Private Key Calculator


    0
    (read -r passphrase; b58encode 80$( brainwallet_exponent "$passphrase" )$( brainwallet_checksum "$passphrase" ))
    Jacki188 · 2019-09-15 21:31:52 173

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Run a command only when load average is below a certain threshold
Good for one off jobs that you want to run at a quiet time. The default threshold is a load average of 0.8 but this can be set using atrun.

Convert spaces in file names to underscores

Which processes are listening on a specific port (e.g. port 80)
swap out "80" for your port of interest. Can use port number or named ports e.g. "http"

list folders containing less than 2 MB of data
This command will search all subfolders of the current directory and list the names of the folders which contain less than 2 MB of data. I use it to clean up my mp3 archive and to delete the found folders pipe the output to a textfile & run: $ while read -r line; do rm -Rv "$line"; done < textfile

Burn CD/DVD from an iso, eject disc when finished.
cdrecord -scanbus will tell you the (x,y,z) value of your cdr (for example, mine is 3,0,0)

Create a single PDF from multiple images with ImageMagick
Given some images (jpg or other supported formats) in input, you obtain a single PDF file with an image for every page.

ASCII art of yourself
Use libcaca to render ascii chars on the webcam input... or don't.

batch convert Nikon RAW (nef) images to JPG
converts RAW files from a Nikon DSLR to jpg for easy viewing etc. requires ufraw package

a function to create a box of '=' characters around a given string.
First argument: string to put a box around. Second argument: character to use for box (default is '=') Same as command #4948, but shorter, and without the utility function.

Let's make screen and ssh-agent friends
When you start screen as `ssh-agent screen`, agent will die after detatch. If you don't want to take care about files when stored agent's pid/socket/etc, you have to use this command.

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