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  • Bash: Handling Command Not Found

    <b>Linux Journal:</b> "After a recent O/S version upgrade (to openSUSE 11.2) I noticed that bash started being a bit more intelligent when I did something stupid: it started giving me a useful error message..."

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  • Socat and rich terminals (with Ctrl+C/Ctrl+Z/Ctrl+D propagation)

    - by Vi
    socat - exec:'bash -li',pty,stderr,ctty - bash: no job control in this shell What options should I use to get fully fledged shell as I get with ssh/sshd? I want to be able to connect the shell to everything socat can handle (SOCKS 5, UDP, OpenSSL), but also to have a nice shell which correctly interprets all keys, various Ctrl+C/Ctrl+Z, tab completion, up/down keys (with remote history). Update: Found "setsid" socat option. It fixes "no job control". Now trying to fix Ctrl+D. Update 2: socat file:`tty`,raw,echo=0 exec:'bash -li',pty,stderr,setsid,sigint,sane. Not it handles Ctrl+D/Ctrl+Z/Ctrl+C well, I can start Vim inside it, remote history is OK.

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  • Run Python Server at Startup

    - by DizzyDoo
    Hello, I've got a few Python based servers that I need to run, and would like them to start automatically when I start my Ubuntu Server box. What is the best way to execute them like this? I was hoping I could write a Bash script and use Screen to get them running in the background, where I can check on them every now and then, but where as echo screen -d -m python works just fine, echo screen -d -m `sudo python /home/matt/tornadoServer/tornadoDeploy.py` doesn't, with no error messages. Is that something to do with the spaces? Even though I did surround it with backquotes? I also tried: WEB="screen -d -m `sudo python /home/matt/tornadoServer/tornadoDeploy.py`" echo $WEB As a way of escaping the spaces, but no luck. What's Bash scripting way to do this? And, once the Bash script works, where can I put it to make it execute on startup?

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  • Mac Terminal: changed my shell, now can't start it

    - by kch
    I installed bash 4.0 via MacPorts, then used sudo chsh -s /opt/local/bin/bash my_user to change my shell. Before that I tried just running plain chsh without sudo, but it wouldn't allow me to change my shell to that path. Now when I try to start Terminal I'm getting a message that my shell has an illegal value, so Terminal won't start. I click Quit, and, unsurprisingly but annoyingly, it quits immediately. How do I reset my shell so I can start Terminal again? How do I set my shell to bash installed via MacPorts in a way that it'll work? Why does Terminal think my shell is illegal anyway? Is it siding with the neo-prohibitionists? Mac OS X 10.5.8. Everything super mega up-to-date.

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  • better options for screen?

    - by lonestar21
    OK. So I love screen. It has saved my bacon a few times when machines crash or get disconnected from the network. However, there are enough reasons keep keep me from using screen for everything, which include: Pain in the butt scrolling. Why can't I just interact as though this is a normal bash shell? My keyboard shortcuts are gone. I have a number of things customized in my bash environment, is there a way to get them to work in screen as well? Are there any tools our tips that I can use to make my screen-using experience as high quality as my bash using experience?

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  • BASH_ENV ignored on solaris?

    - by Peeter Joot
    In my .bash_profile, executed for both my interactive and non-interactive logins are BASH_ENV=$HOME/.myinteractivestuff export BASH_ENV doing this for bash on Linux works fine, but on Solaris is not sourced: bash --version GNU bash, version 3.00.16(1)-release (sparc-sun-solaris2.10) Curiously, if I invoke screen within my login shell, BASH_ENV is then read. Are any restrictions on when $BASH_ENV is respected on Solaris? In my case I'm logging in with ssh using putty, but also tried unix to unix ssh, and telnet and see the same. Note that I know that my BASH_ENV variable assignment is being executed since I can echo this variable after login without any trouble (ie: ruling out the obvious possibility that my .bash_profile is also not being read).

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  • Mac terminal: Resource temporarily unavailable

    - by user167108
    I'm getting an error message in the Mac Terminal when I try to run several different processes. I did some googling and looking on this site, and found out that it might be related to having too many processes running at one time. However, I'm getting these error messages when I only have a few windows open (much fewer than I was accustomed to having). Looking in activity Monitor, my %User number is at around 25%, and the %System number is around 15%. In the past, I have had both much much higher (until the people at the Apple store told me to keep an eye on it). So with these numbers lower now, what explains the Resource temporarily unavailable error message? heroku (cloud hosting) console -bash: fork: Resource temporarily unavailable -bash-3.2$ upon opening new window in the terminal sh: fork: Resource temporarily unavailable sh: fork: Resource temporarily unavailable trying to run -bash: fork: Resource temporarily unavailable

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  • Directories will list, but are not recognize by cd

    - by mdimond
    New to terminal and having problems out of the gate. Using Terminal 2.1.2 on a Mac running 10.6.8. Using the "ls Documents" will list the contents, but when I try to change directories, which I tried several different ways, I get the following results: new-host-2:~ MDimond$ cd. -bash: cd.: command not found new-host-2:~ MDimond$ cd./Users/MDimond/Documents -bash: cd./Users/MDimond/Documents: No such file or directory new-host-2:~ MDimond$ cd. /Documents -bash: cd.: command not found The /usr/bin has the cd command listed; the /bin does not. Any assistance would be greatly appreciated. Thanks, md

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  • Use alias source with relative path

    - by notme
    I want to add an alias file to my project folder to quickly open and edit files in it with a simple shell command. To make it more portable, I would like to use only relative paths. I want something like this: ### .profile source /my/project/folder/aliases.bash and ### aliases.bash editprojectfiles="edit [/my/project/folder/]afile.txt" The problem for me now is how to retrieve [/my/project/folder/] automatically. I tried to use $PWD variable, but the result is that the alias points to the folder of .profile file and not the aliases.bash ones. Is there a way to get this?

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  • Ruby vs Lua as scripting language for C++

    - by bl00dshooter
    I am currently building a game server (not an engine), and I want it to be extendable, like a plugin system. The solution I found is to use a scripting language. So far, so good. I'm not sure if I should use Ruby or Lua. Lua is easier to embed, but Ruby has a larger library, and better syntax (in my opinion). The problem is, there is no easy way I found to use Ruby as scripting language with C++, whereas it's very easy with Lua. Toughs about this? Suggestions for using Ruby as scripting language (I tried SWIG, but it isn't nearly as neat as using Lua)? Thanks.

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  • removing a case clause: bash expansion in sed regexp: X='a\.b' ; Y=';;' sed -n '/${X}/,/${Y}/d'

    - by ChrisSM
    I'm trying to remove a case clause from a bash script. The clause will vary, but will always have backslashes as part of the case-match string. I was trying sed but could use awk or a perl one-liner within the bash script. The target of the edit is straightforward, resembles: $cat t.sh case N in a\.b); #[..etc., varies] ;; esac I am running afoul of the variable expansion escaping backslashes, semicolons or both. If I 'eval' I strip my backslash escapes. If I don't, the semi-colons catch me up. So I tried subshell expansion within the sed. This fouls the interpreter as I've written it. More escaping the semi-colons doesn't seem to help. X='a\.b' ; Y=';;' sed -i '/$(echo ${X} | sed -n 's/\\/\\\\/g')/,/$(echo ${Y} | sed -n s/\;/\\;/g')/d t.sh And this: perl -i.bak -ne 'print unless /${X}/ .. /{$Y}/' t.sh # which empties t.sh and eval perl -i.bak -ne \'print unless /${X}/ .. /{$Y}/' t.sh # which does nothing

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  • (PHP vs Python vs Perl) vs Ruby [closed]

    - by Dr.Kameleon
    OK, here's what : I've programmed in over 20 different languages and now, because of a large project I'm currently working on for Mac OS X (in Objective-C/Cocoa), I need to make a final decision on which language to use for my background scripting + plugin functionality. Definitely, one factor that'll ultimately influence my decision is which one I'm most familiar with, which is PHP (one of the ugliest languages around, which I however adore... lol), then Python / Perl (the "proven values"... )... and then Ruby (which, to me, is almost confusing and I've only played with it for some time.) Now, here's my considerations : (As previously mentioned) Being familiar with it (anyway, if X is better in my case, I really don't mind studying it from scratch...) Speed Good interaction with the Shell + ease of integration with my Cocoa application Btw, some of the reasons that made me wonder if Ruby would be a good choice is : The hype around it (although, I still don't get why; but that's probably just me...) My major competitor (we're actually talking about the same type of software here) is using Ruby for its backend scripting almost exclusively (ok, along with some BASH). Isn't Ruby considered slower e.g. than Perl? Why did he choose that? Simply, a matter of personal taste? So... your thoughts?

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  • How to present a stable data model in a public API that allows internal data structures to be changed without breaking the public view of the data?

    - by Max Palmer
    I am in the process of developing an application that allows users to write C# scripts. These scripts allow users to call selected methods and to access and manipulate data in a document. This works well, however, in the development version, scripts access the document's (internal) data structures directly. This means that if we were to change the internal data model/structure, there is a good chance that someone's script will no longer compile. We obviously want to prevent this breaking change from happening, but still want to allow the user to write sensible C# code (whilst not restricting how we develop our internal data model as a result). We therefore need to decouple our scripting API and its data structures from our internal methods and data structures. We've a few ideas as to how we might allow the user to access a what is effectively a stable public version of the document's internal data*, but I wanted to throw the question out there to someone who might have some real experience of this problem. NB our internal document's data structure is quite complex and it could be quite difficult to wrap. We know we want to expose as little as possible in our public API, especially as once it's out there, it's out there for good. Can anyone help? How do scripting languages / APIs decouple their public API and data structures from their internal data structures? Is there no real alternative to having to write a complex interaction layer? If we need to do this, what's a good approach or pattern for wrapping complex data structures that include nested objects, including collections? I've looked at the API facade pattern, which looks like it's trying to address these kinds of issues, but are there alternatives? *One idea is to build a data facade that is kept stable across versions of our application. The facade exposes a set of facade data objects that are used in the script code. These maintain backwards compatibility and wrap access to our internal document's data model.

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  • Linux bash: when to use egrep instead of grep?

    - by Michael Mao
    Hi all : I am preparing for a Linux terminal assessment now, I tried to Google and found most resources are referring to the basic "grep" rather than the more powerful "egrep" -- well, that is at least what the professor said in lecture. I am always working with small samples so performance tuning is a thing too far away. So basically I'd like to know are there any areas where I must switch to egrep to do it in a better way? Is it safe to work with basic "grep" as for now? will there be potential risks? Sorry about my limited knowledge on Linux shell commands, the man page looks like a maze to me and honestly I haven't put much time in understanding all the features both command provide.

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  • How to send a signal SIGINT from script to script ? BASH

    - by debugger
    I want to trap a signal send from Script-A.sh to Script-B.sh so in Script-A.sh i use the command (Send SIGINT to Script-B.sh) kill -2 $PID_Script-B.sh And in Script-B.sh i catch the signal and call function Clean trap 'Clean' 2 It does not work, instead the Script-B.sh is killed right away without performing the Clean !! What i notice also is that if i want to send SIGINT from terminal to any script that traps it, a ctrl-c will be catched correctly, but not if i specify the signal via the command kill -2 $pid_of_script Any idea about the difference between the two method to send the SIGINT (ctrl-c VS kill -2 $pid_of_script), and how i can send a SIGINT from a script to another ? Regards, Debugger

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  • How to transform multiple line into one line in bash stdout ?

    - by Samantha
    Hello, I sometimes do this in my shell : sam@sam-laptop:~/shell$ ps aux | grep firefox | awk '{print $2}' 2681 2685 2689 4645 $ kill -9 2681 2685 2689 4645 Is there a way I can transform the multiple lines containing the PIDs into one line separated by spaces ? (It's a little bit annoying to type the PIDs every time and I really would like to learn :) ) Thanks a lot.

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  • bash: how to know NUM option in grep -A -B "on the fly" ?

    - by Michael Mao
    Hello everyone: I am trying to analyze my agent results from a collection of 20 txt files here. If you wonder about the background info, please go see my page, what I am doing here is just one step. Basically I would like to take only my agent's result out of the messy context, so I've got this command for a single file: cat run15.txt | grep -A 50 -E '^Agent Name: agent10479475' | grep -B 50 '^==' This means : after the regex match, continue forward by 50 lines, stop, then match a line separator starts with "==", go back by 50 lines, if possible (This would certainly clash the very first line). This approach depends on the fact that the hard-coded line number counter 50, would be just fine to get exactly one line separator. And this would not work if I do the following code: cat run*.txt | grep -A 50 -E '^Agent Name: agent10479475' | grep -B 50 '^==' The output would be a mess... My question is: how to make sure grep knows exactly when to stop going forward, and when to stop getting backward? Any suggestion or hint is much appreciated.

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  • How do I extract the values from this data using bash and awk?

    - by ben Rod
    I grepped these, how do I extract the values? ... cavity_2mgl_wt_strip57001.out: Total cavity volume (A3) : ( 1.240E+01) cavity_2mgl_wt_strip58001.out: Total cavity volume (A3) : ( 2.408E+00) cavity_2mgl_wt_strip60001.out: Total cavity volume (A3) : ( 4.935E+00) cavity_2mgl_wt_strip61001.out: Total cavity volume (A3) : ( 1.319E+00) cavity_2mgl_wt_strip63001.out: Total cavity volume (A3) : ( 1.532E-01) cavity_2mgl_wt_strip64001.out: Total cavity volume (A3) : ( 1.137E+01) ... and I need the index # in the filename in bold: cavity_2mgl_wt_strip76001.out: Total cavity volume (A3) : ( 1.276E+01) and I need the number in the parenthesis cavity_2mgl_wt_strip76001.out: Total cavity volume (A3) : ( **1.276E+01**)

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