Making the Most of Andrew
In previous articles I focused a great deal on the ez editor and on the multi-media user mail agent, messages, but these are only two of a rich set of applications. Here are a few other applications that you'll find useful:
bush (see Figure 1) provides a graphical interface to the file system. It shows the directory hierarchy, filenames and their attributes. It also provides a window where the ez editor will run as well as a means to invoke an arbitrary command on a file. With bush you can sort the list, rename, and delete files, too.
chart allows you to create simple graphs from numeric data. The data can be presented as a histogram, pie chart, or line graph.
ezdiff is not actually an application, but rather a procedure you can call from all ez windows. This is used to run the diff command on the data in two windows and then interactively see the difference between the files.
To try ezdiff, edit two files (e.g., ez/etc/hosts .deny/etc/hosts.equiv). In each window, select the Start item on the Ezdiff menu card. As you select the Next item on the Ezdiff menu card, the differences in each file are shown as highlighted data. This makes it very easy to copy lines selected in one window and paste them in the other. And yes, ez correctly remembers the locations of all the other differences when you make changes to either document. This is a life saver when looking at various versions of a file.
figure (see Figure 2) is a fairly conventional drawing editor. The files usually have an extension of .fi. Figure can create a document with lines, circles, boxes, and other insets (e.g., rasters or text), and then move them around, reshape, etc. Since figure creates an ATK data-stream, you can easily insert figures in other AUIS documents.
pipescript (see Figure 3) reads data from stdin and displays it in a window. This is very convenient with pipes, because the output data does not disturb your xterm window and yet is not in a file you need to remove. The data can be conveniently scrolled, searched or saved. I use it all the time for commands like tar tzvf auis63L1-wp.tgz | pipescript.
raster provides a simple means to edit digitized pictures (called rasters). The data must be in AUIS data-stream format. The pbmplus package (available on sunsite) provides a wide set of filters to convert between various forms of digitized data. For example, to convert from a TIFF to an AUIS-raster, I'd use this command:
tifftopnm test.tif | ppmquant 256 | ppmtopgm\ | pgmtopbm | pbmtocmuwm > test.ras
typescript (see Figure 4) provides an alternative to xterm. You enter commands to your shell in the input window and the results are shown in the same window where they can be scrolled, searched or saved. Typescript does not support curses like xterm does, so you cannot run vi or bash in a typescript, for example. However, you can use the tcsh or pdksh (ksh) shells.
Typescript has several other features that I find very useful. The README for the word processing package describes how you can cause the current working directory to be kept in the title of the typescript window. Typescript is “smart” about these paths, too. Notice in Figure 4 that the path shown in the title of the window is “~”, my home directory, and not a fully qualified path.
Typescript supports the use of several PC keys to make it easier to enter commands. The Cursor-Left and Cursor-Right keys can be used to edit the current command (regardless of whether my shell supports this). The Home and End keys will move the cursor to the beginning or end of the line (or selected area). The cursor keys are also mapped to allow me to move up and down through the command history. Cursor-Up gets the previous command entered, Cursor-Down the next.
In my opinion an even more useful feature is command completion. If I type ls and then press Cursor-Up, I get the previous command that began with “ls”. File completion is supported with the tab key. If I enter ls src/tp and then press the tab key, typescript will complete the path “src/tp” to “src/tpg-config” (in my case). It makes entering paths to files ten times easier. I love it!
If I enter a command like ls /etc, the window will likely fill and scroll automatically. If I want to see the beginning of the scrolled data, I must use the mouse (or Page-Up/Down keys) to scroll. However, if I enter ls /etc control-J (where I enter the command with a control-J keystroke, rather than the normal Enter), the command is executed, but the output is pushed to the top of the current window so I do not need to scroll.
Typescript also allows me to create my own menus in the file ~/.shmenu. In Figure 4, you can see I have a menu card Internet on the menubar. This is from my own .shmenu file which looks like this:
# User's .shmenu file # Do help .shmenu for more information. # Establish the pop up menus for the # typescript window. Internet~20,FTP<->Sunsite export~15:ftp sunsite.unc.edu Internet~20,FTP<->CMU~16:ftp.andrew.cmu.edu Internet~20,FTP_Anonymous~20:anonymous Internet~20,FTP_Ident~21:firstname.lastname@example.org Internet~20,FTP_bin~22:bin Internet~20,FTP_submissions~23:cd pub/next/submissions Internet~20,Telnet->CMU~31:telnet ftp.andrew.cmu.edu Internet~20,Bring Slip Up~40:/usr/local/bin/slipup Internet~20,Take Slip Down~41:/usr/local/bin/slipdown
Practical Task Scheduling Deployment
July 20, 2016 12:00 pm CDT
One of the best things about the UNIX environment (aside from being stable and efficient) is the vast array of software tools available to help you do your job. Traditionally, a UNIX tool does only one thing, but does that one thing very well. For example, grep is very easy to use and can search vast amounts of data quickly. The find tool can find a particular file or files based on all kinds of criteria. It's pretty easy to string these tools together to build even more powerful tools, such as a tool that finds all of the .log files in the /home directory and searches each one for a particular entry. This erector-set mentality allows UNIX system administrators to seem to always have the right tool for the job.
Cron traditionally has been considered another such a tool for job scheduling, but is it enough? This webinar considers that very question. The first part builds on a previous Geek Guide, Beyond Cron, and briefly describes how to know when it might be time to consider upgrading your job scheduling infrastructure. The second part presents an actual planning and implementation framework.
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With all the industry talk about the benefits of Linux on Power and all the performance advantages offered by its open architecture, you may be considering a move in that direction. If you are thinking about analytics, big data and cloud computing, you would be right to evaluate Power. The idea of using commodity x86 hardware and replacing it every three years is an outdated cost model. It doesn’t consider the total cost of ownership, and it doesn’t consider the advantage of real processing power, high-availability and multithreading like a demon.
This ebook takes a look at some of the practical applications of the Linux on Power platform and ways you might bring all the performance power of this open architecture to bear for your organization. There are no smoke and mirrors here—just hard, cold, empirical evidence provided by independent sources. I also consider some innovative ways Linux on Power will be used in the future.Get the Guide