Compared to Bash, I simply haven't noticed.

Doing either of those in Python or Perl is overkill. Finally, who cares?

Tribus: Buenos Aires... What can I say? Each time you do that, some piece of code is reading that data. I figure you could spend pretty much most of a entire semester just getting people familar with Redhat and the various associated tools and common services before you'd ever have to get past really basic shell stuff. Plus there are times when knowing a shell well can save your bacon (on a fork-bombed system where you can't start any new processes, or if /usr/bin and or /usr/local/bin fail to mount). How can I translate a shell script to Perl? From the other comments I realize that my head and tail commands - which I assumed could start reading at a specific place in the file - can't, and were the main source of the slowness. Python: First of all there is o… What prevents dragons from destroying or ruling Middle-earth? It's great for the simplest 1-5 line one-off tasks, but things that are dead simple in Perl or Python like array manipulation are horribly ugly in bash. This probably comes from believing they have to climb it rather than it being a graph of knowledge vs time. It's been a few years(~4), but I've never had problems with perl on HP-UX or AIX. for plotting). STOIE: View Public Profile for STOIE: Find all posts by STOIE # 5 08-26-2010 pinga123. A steep learning curve means that more information can be learned over a short time.

;-), Last Activity: 11 December 2012, 10:55 AM EST, Last Activity: 31 August 2011, 10:26 PM EDT. Shell scripts (esp. Am I being hacked? Why is processing a sorted array faster than processing an unsorted array? By the way, I usually have some python calls in my bash scripts (e.g. Updated script based on Brent's comment: This one is untested. Not literal system calls. Particularly since most modern Unices come with both Perl and Python. To subscribe to this RSS feed, copy and paste this URL into your RSS reader. I would profile all three solutions and pick which is best in terms of initial startup speed, processing speed, and memory usage. site design / logo © 2020 Stack Exchange Inc; user contributions licensed under cc by-sa. By contrast Perl is just Perl and whatever Perl program you write is going to work pretty much anywhere Perl is available. Read our affiliate link policy. In the case of comparison commands, there has some basic difference between Powershell vs Bash, Powershell normally uses below comparison commands for writing the script. Most people believe, mistakenly, that a steep learning curve is bad.

Use whatever is best for the task! You say you cut stuff between two timestamps on a file. Surname 1 Student’s Name Instructor’s Name Course Date Perl versus Bash While I consider myself a Perl programmer, I find bash quite handy and simple to use. try this a substitute for your first example (less typing, more, ls | xargs process would also work, in the same manner, but all these methods have a bug: they don't work with filenames with spaces or linefeeds in. While most systems probably have perl, I don't think its a guarantee. I've written my fair share of bash scripts and I've written a few python scripts/programs. Lucky me, right? IIRC, they were all vendor supplied versions as well.This was all for using perl as a sys admin tool, so nothing more complicated than what you could achieve in a shell using pipes, just imminently more readable. It does not make sense for me to dive into system programming for a intro class. Based on the shell code you have, with multiple calls to tail/head, I'd say absolutely Perl could be faster.

It "needs citation" because it is wrong. ssh foo dpkg -l|grep ^ii|cut -d\ -f3 > log; dpkg -l|grep ^ii|cut -d\ -f3|diff -U 1 - logGrepping through logs, searching/manipulating files... grep and xargs I use constantly.This isn't to say that you should expect students to display mastery of the commandline after a single course, but really... the blame probably lies more with the teacher. "Not a real question" is not at all the same thing as what you mean, which is "not enough detail for me to make an unchallengeable, final, definitive answer". The resultant split file seems to ignore the rest of the line and I lose the data. The overhead of creating new processes on Unix isn't as severe as it may have been on Windows, but it's still not entirely negligible as you have to reinitialise the C runtime library (libC) each time, parse arguments, open files (perhaps), etc. I've building a bunch of bash scripts, and am thinking about "converting" to perl, and have a couple questions first: 4. Re: bash vs perl by KurtSchwind (Chaplain) on Jan 11, 2008 at 14:16 UTC: I think you hit a good example of when perl outpaces bash. Bash scripting and perl scripting is all a very useful tool, but it's not even something people will need to do all that often for most things people use Linux for nowadays. Using cat have the added advantage of making it easier to change the orderer of the following steps. $FROM and $TO are really regex to your start and end time. Powershell is planning to provide one of the great utility for any Administrator user of managing both the workloads windows server and Linux server where production application is basically hosted.

What would be a better approach to write methods which returns several different string outputs? How do I tell if a regular file does not exist in Bash? Pages 5.

By joining our community you will have the ability … The 'WTF per minute' rule. What prevents dragons from destroying or ruling Middle-earth? Last Activity: 28 March 2011, 12:49 PM EDT, I cannot compare Python, as I do not use snakes here.

It is rather command processor. We expect answers to be supported by facts, references, or expertise, but this question will likely solicit debate, arguments, polling, or extended discussion. However, doing this normally would only make it so newly added users will be affected by this.

Are there any performance or power differences between the two? Ars Praefectus Registered: Jun 30, 1999. For this I want to use unix sort command and before that I want to make sure that unix sort command has any file size limitations. 2. Because of this, on modern Linux/Unix systems, people might prefer to use #!/usr/bin/env perl as the hash-bang line.

ALL RIGHTS RESERVED. The advantage of shell scripting is that it's globally present on *ix boxes, and has a relatively stable core set of features you can rely on to run everywhere. So if we have #!/usr/bin/env perl in our script it will always use the first perl in our PATH.

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it depends on how your bash script is written. Anyone with your or my upvote count in perl tag has been around the block enough times to know what his bash script probably looks like, and to make a provisional answer on that basis.

Stack Overflow for Teams is a private, secure spot for you and However, if the extract was amenable to being formed by a bash script that creates parameters for and then calls grep with a regex then that could be faster than a 'pure' script.

So ya.. perl is going to be avialable on any system worth giving a crap about.

I'm just wondering why they decided not to include these handy... Hi, Stack Overflow for Teams is a private, secure spot for you and

The Bourne shell (ignoring bash - you don't normally have to resort to bash extensions to write shell scripts) has not been 'hacked about' all that much to be a scripting language - it's probably 30 years old and the basic programming features like loops, conditions and functions were there from the outset. For anything involving mainly the manipulation of structured data, I'd use Perl. The Python os and shutil modules have most of what I need most of the time, and there are built-in modules for handling tarfiles, gzip files, zip files, etc. from the man page, batch create thumbs of all jpgs in directory in parallel: ls *.jpg | parallel convert -geometry 120 {} thumb_{}. It used to be that Bash scripts often got replaced by Perl scripts because Perl was more powerful. I almost never use that and it's tedious when I have to. I just meant the version you install or built into /usr/local rather /usr/bin, such as can be had at sunfreeware.com. Honestly, I've never noticed. Powershell vs Bash both are a very much popular configuration management tool for two different operating systems Windows and Unix. But I still think it's worth it to learn bash. Why is printing “B” dramatically slower than printing “#”? Shell scripting languages are typically lacking in expressiveness, functionality and performance. Registered User.

It uses a recursive function to find the timestamps. Join Date: Sep 2009. You may also have a look at the following articles to learn more –, All in One Software Development Bundle (600+ Courses, 50+ projects).

If your doing embedded systems then that's a whole different set of issues that you don't want to go into with a class like that. For actually writing a program that I expect to maintain and use over time, Bash is rarely the right tool for the job. I don't think it's a matter of how useful Perl is, but if you can't hack it with basic bash scripts... really, what are you going to be able to do? @Bdonlan: you can solve the left to right issue by writing. Bash is mainly prepared for Unix and Linux, it is also using for Unix or Linux from the first day onwards. And also please let me know whether I have to change any... What characters can't be used with a mkdir? The MBR is the... Hi,

Also, Perl … Never mind the sheer number of bash scripts you're going to come across from time to time; the beauty of bash is what you can do on the command line, and then if you need to do it again you can fluidly go from a complex pipeline to a script. How do I parse command line arguments in Bash? What happens if you get over 20 on a death save? Thanks - I used the basic code above and the results are stunningly faster. Does Python have a ternary conditional operator? The partition table is located in the master boot record (MBR) of a disk. On my system, it took about a second to filter 900,000 lines out of a million: Perl is absurdly faster than Bash. Do Presidential Campaigns often visit non-competitive states in the days right before the election. Perl 6 is installed as different executable, so you can use Perl 5 in any case. Ad Choices. That said, if your "bash" script is not looping, just calling other programs, then there isn't any gain to be had. When you get that so small and custom that you don't even have perl avialable then it's not really even 'unix' or 'linux' much.

And hacking command lines together from strings in a language without strong string processing features and libraries, to ensure the escaping is correct, invites security problems.



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