Commands tagged grouping (1)

  • A bitcoin "brainwallet" is a secret passphrase you carry in your brain. The Bitcoin Brainwallet Exponent Calculator is the second of three functions needed to calculate a bitcoin PRIVATE key. Roughly, checksum is the first 8 hex digits of sha256(sha256(0x80+sha256(passphrase))) Note that this is a bash function, which means you have to type its name to invoke it Show Sample Output

    function brainwallet_checksum () { (o='openssl sha256 -binary'; p='printf';($p %b "\x80";$p %s "$1"|$o)|$o|sha256sum|cut -b1-8); }
    nixnax · 2014-02-18 02:07:02 0

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Place the NUM-th argument of the most recent command on the shell
After executing a command with multiple arguments like cp ./temp/ ~/prog/ you can paste any argument of the previous command to the console, like ls -l ALT+1+. is equivalent to ls -l ./temp/ ALT+0+. stands for command itself ('ls' in this case) Simple ALT+. cycles through last arguments of previous commands.

Recursive find and replace file extension / suffix (mass rename files)
Find recursively all files in ~/Notes with the extension '.md' and pipe that via xargs to rename command, which will replace every '.md' to '.txt' in this example (existing files will not be overwritten).

list block devices
Shows all block devices in a tree with descruptions of what they are.

Number of files in a SVN Repository
This command will output the total number of files in a SVN Repository.

find and delete empty directories recursively
this will show the names of the deleted directories, and will delete directories that only no files, only empty directories.

Print diagram of user/groups
Parses /etc/group to "dot" format and pases it to "display" (imagemagick) to show a usefull diagram of users and groups (don't show empty groups).

send a file or directory via ssh compressing with lzma for low trafic

Recall last argument of previous command
!$ recalls the last argument of the previous command. This is very useful when you have to operate several operations on the same file for example.

save stderr only to a file
taken from " What does it mean? The redirection operator n>&m makes file descriptor n to be a copy of file descriptor m. So, whe are: - Opening a new file descriptor, 3, that is a copy of file descriptor 1, the standard output; - Making file descriptor 1 a copy of file descriptor 2, the standard error output; - Making file descriptor 2 to be a copy of file descriptor 3 (the "backup" of the standard output) in a short: we swapped the standard output and the standard error output. "

Install the Debian-packaged version of a Perl module
Running 'cpan Module::Name' will install that module from CPAN. This is a simple way of using a similar command to install a packaged Perl module from a Debian archive using apt-get.

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