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  1. Last 7 days
  2. Jul 2020
  3. Jun 2020
    1. To get a feel for how much pseudo-random data is available in your entropy pool, you can run this command:$ cat /proc/sys/kernel/random/entropy_avail 2684 The number shown appears to represent the number of bits of entropy that have been collected. Even 2,684 might not seem like much in a world in which we routinely speak in terms of terrabytes, but numbers above 100 are said to be a good sign. I
  4. May 2020
  5. Apr 2020
    1. I had never considered it that in nearly a decade of using GNU find! Thank you for that! It will definitely change the way I think about -prune from now on.
    2. I think this structure is much easier and correlates to the right approach
    3. it isn't actually -prune itself that causes this, by the way. The issue is that the or operator "short-circuits", and or has lower precedence than and. The end result is that if a file called .snapshot is encountered it will match the first -name, -prune will then do nothing (but return true), and then the or returns true since its left-argument was true. The action (eg: -print) is part of its second argument, so it never has a chance to execute.
    4. If all you want to do is print the results you might be used to leaving out the -print action. You generally don't want to do that when using -prune.
    5. which means that it'll also print out the name of the directory you're pruning, which usually isn't what you want. Instead it's better to explicitly specify the -print action if that's what you want
    6. The thing I'd found confusing about -prune is that it's an action (like -print), not a test (like -name). It alters the "to-do" list, but always returns true.
    1. Did you expect the temp directory to get printed? In the last example, we saw the directories ./temp and ./C/temp got printed, but not now. This is the effect of the -print option. By default, the find command prints all the files matching the criteria. However, once the -print option is specified, it will print files only on explicit print instructions. In this find command, -print is associated in the other side of the OR condition, and hence nothing will get printed from the 1st part of the condition.
    2. 12. Same using the wholename option and prune to exclude directory: $ find . -wholename "./temp" -prune -o -perm 644 -print ./area.pm ./C/temp ./C/f2.c find has a switch with the name 'wholename'. Say, in your directory tree, there might be more than one temp directory. The earlier approaches will prune all the temp dierctories. In case, if the requirement is to prune a specific temp directory, then you can give the path of the directory itself. Note: The path specified in the wholename option should be relative to the search path specified, not the absolute path. 
  6. Mar 2020
  7. Jan 2020
  8. Dec 2019

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    1. An ssh public key in a ~/.ssh/authorized_keys file can have a command="" option which forces a particular command to be executed when the key is used to authenticate an ssh connection. This is a security control that mitigates against private key compromise. This is great when you only need to execute a single command. But if you need to perform multiple tasks, you would normally need to create and install a separate key pair for each command, or just not bother making use of forced commands and allow the key to be used to execute any command.
    1. echo "from="${MYIP%% *}",no-port-forwarding,no-X11-forwarding,no-agent-forwarding,no-pty,command="rsync ${SSH_ORIGINAL_COMMAND#* }" $(ssh-keygen -yf ~/.ssh/rsync_rsa)" | ssh targetserver "cat - >>~/.ssh/authorized_keys" Note that the ‘command=’ restriction (http://larstobi.blogspot.ch/2011/01/restrict-ssh-access-to-one-command-but.html) will not apply if ‘/etc/sshd_config’ has already a ‘ForceCommand’ directive.
    1. GitHub Packages uses the native package tooling commands you're already familiar with to publish and install package versions.

      Looks like GitHub Packages acts as a wrapper to these clients, acting on your behalf so you don't have to use the CLI yourself.

    1. Using find and cpio is a more unix-y approach in that you let find do the file selection with all the power that it has, and let cpio do the archiving. It is worth learning this simple use of cpio, as you find it easy to solve problems you bang your ahead against when trying tar.
    2. find
  • Nov 2019
    1. From the man pages The environment variables can be specified in lower case or upper case. The lower case version has precedence. http_proxy is an exception as it is only available in lower case. Using an environment variable to set the proxy has the same effect as using the --proxy option
  • Mar 2018
    1. when you ask the same people to do something FOR you, e.g. lend you a book or sign a recommendation letter for you, you can’t just use ください.

      This is like a homeless person saying "give me money, sir." It is still an order.

  • Nov 2017
    1. In Bash you quite often need to check to see if a variable has been set or has a value other than an empty string. This can be done using the -n or -z string comparison operators.

      Two most useful commands in bash

  • Jun 2017
  • May 2017
    1. Every time a customer service assistant shrugs and says “computer says no” or an organization acts in crazy, inflexible ways, odds-are there’s a database underneath which has a limited, rigid view of reality and it’s simply too expensive to fix the software to make the organization more intelligent. We live in these boxes, as pervasive as oxygen, and as inflexible as punched cards.

      Isn't it interesting how the rigidity of institutionalised "old economy"-businesses and their management structure as well as their work ethics is, in a way, mimicked by their IT-architecture? Efficiency over effectiveness, stability over flexibility, repetition over creative destruction and innovation. And then came Agile...

  • Nov 2015
    1. If you have a copy of the ReSpec repository handy, you may see that there is also a respec2html.js tool under tools/. Feel free to try using it instead of the above process, but please note that it is not used much currently and may behave in a somewhat experimental manner (experiences with it vary — but it's worth a shot if you're looking for a way to generate ReSpec output from the command line).

      Respec (sadly) doesn't quite have a command line tool...at least not one comparable to a browser's output.

      Maybe PhantomJS (which Respec uses for tests) would do a better job?

    1. Infrastructures, for Collier, are amixture of political rationality, administrative techniques, and material systems, and his interest isnot in infrastructure per se but in what it tells us about practices of government. Soviet electricityprovision, through this lens, is analyzed for how it reveals a system of total planning in a commandeconomy rather than for what it tells us about the effects of electricity on users in Russia.

      It's never really about what is in front of us when it comes to politics.. there is always more to it.. His theory is a tool we could study to learn about a country/society's government by looking at the infrastructure they've created.

  • Sep 2013
    1. What, then, are the requisites of a good general and what ability do they involve?

      Qualities of a good leader