Unix system administration commonly consists of repeating common and similar operations on different sets of targets. The notion of using, and stringing together, building block primitives such as cat, sort, strings, wc, sed and awk is a core tenet of Unix philosophy. //
By incorporating the data into the script itself, one can create powerful system administration tools, in the form of simple shell scripts, that consist merely of a single file.
The basic organization of such a script is a set of one or more data items which are commented out, as they are not actual commands, but commented in such a way that they can be distinguished from normal comments:
01: #!/bin/sh
02: #
03: # Here is the data set, and perhaps we will add some other comments here
04: #
05: ##DATA var1 var2 var3
06: ##DATA var1 var2 var3
07: ##DATA var1 var2 var3As you can see, normal comments are commented out with one # character, but data items are commented with ##. Not only does this allow us the ability to parse through the script and easily identify which lines are data lines (as opposed to normal comments), but it also allows us to quickly disable a data line that we temporarily do not wish to use. Simply remove one of the # characters from the data line that is not to be used - it will not be parsed because it has no leading ##, but it still starts with #, and thus does not affect the script as it is still commented out.
The body of the script consists of a variable defining the path of the script itself (obviously the script needs to know the path to itself if it is to parse itself), and then a while loop that reads in every line of the script, but filters out (using grep) only those lines that are data lines, which begin with ##DATA :
08: myself=/usr/local/bin/script.sh
09:
10: while read line
11: do
12:
13: if echo $line | grep "^##DATA"
14: then
15:
16: var1=`echo $line | awk '{print $2}'`
17: var2=`echo $line | awk '{print $3}'`
18: var3=`echo $line | awk '{print $4}'`
19:
20: diff $var1 $var2 >> $var3
21:
22: fi
23:
24: done < $myselfWhat is happening here is that the script, in line 08, defines the path to itself, and uses a "while read line" construct, the end of which in line 24 takes as input the name of the script itself. ...
Hello and welcome to the r/datacurator filetree repository.
We aim to create a unified filetree for all kinds of data, which should help in storing, categorising and retrieving.
About
a standard filetree for /r/datacurator [ and r/datahoarder ]
Enter File size, Transfer Rate, select units, and then click Calculate.
Geerling’s experiment underscores a humorous yet insightful reality: while pigeons can outperform fiber optics in specific, limited scenarios, the internet remains the superior choice for large-scale and long-distance data transmission. As data volumes continue to grow exponentially—reaching into the petabit range—the efficiency and scalability of fiber and other digital technologies are indispensable.
Cloud apps like Google Docs and Trello are popular because they enable real-time collaboration with colleagues, and they make it easy for us to access our work from all of our devices. However, by centralizing data storage on servers, cloud apps also take away ownership and agency from users. If a service shuts down, the software stops functioning, and data created with that software is lost.
In this article we propose “local-first software”: a set of principles for software that enables both collaboration and ownership for users. Local-first ideals include the ability to work offline and collaborate across multiple devices, while also improving the security, privacy, long-term preservation, and user control of data.
We survey existing approaches to data storage and sharing, ranging from email attachments to web apps to Firebase-backed mobile apps, and we examine the trade-offs of each. We look at Conflict-free Replicated Data Types (CRDTs): data structures that are multi-user from the ground up while also being fundamentally local and private. CRDTs have the potential to be a foundational technology for realizing local-first software.
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