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  • Advantages of a deployment tool over shell

    - by Jimmy
    Currently I have all of my deployment scripts in shell, which installs about 10 programs and configures them. The way I see it shell is a fantastic tool for this: Modular: Only one program per script, this way I can spread the programs across different servers Simple: Shell scripts are extremely simple and don't need any other software installed One-click: I only have to run the shell script once and everything is setup Agnostic: Most programmers can figure out shell, and don't need to know how to use a specific program. Versioning: Since my code is on github a simple git pull and restart all of supervisor will run my latest code. My question is, with all of these advantages, why is it people are constantly telling me to use a tool such as ansible or chef, and not to use shell.

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  • Select (loop) or command not working in shell-script

    - by user208098
    I've been tinkering with Linux and Unix for years but still a novice in my mind and recently find myself trying to be more pro with it as I work in IT. So with that notion I'm studying shell scripting. I've hit a snag in ubuntu using the latest version 13.10 Saucy. When I use the select command in a sh script it doesn't work, depending on how I format the command it will either return Unexpected "do" or Unexpected "done". See the following two examples: This section of code produces an unexpected "do" error: #/bin/bash PS3='Please enter your choice' select opt in option1 option2 option3 quit do case $opt in "option1") echo "you chose choice 1" ;; "option2") echo "you chose choice 2" ;; "option3") echo "you chose choice 3" ;; "quit") break ;; *) echo invalid option ;; esac done This section of code produces an unexpected "done" error. #/bin/bash PS3='Please enter your choice' select opt in option1 option2 option3 quit ; do case $opt in "Option1") echo "you chose choice 1" ;; "Option2") echo "you chose choice 2" ;; "Option3") echo "you chose choice 3" ;; "quit") break ;; *) echo invalid option ;; esac done When I enter these parameters into the command line interactively or manually I get the desired result which is a list of choices to choose from. However when executed from a script I get the before mentioned errors. Also a side note I have tried this in Fedora as a script and it worked perfectly so my question is why isn't it working in Ubuntu, is this a difference between RHL and Debian? Or is it a bug in the latest version of Ubuntu? Thanks in advance for any help! KG

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  • Regarding UNIX Shell Script

    - by arav
    When there is no files inside the folder the below script goes inside the for loop. Not sure what i can modify so that it doesn't go inside the for loop. Also when there is no files inside the directory exit status should be success. Wrapper script checks the exit status of the below script FILESRAW ="/exp/test1/folder" . for fspec in "$FILESRAW"/* ; do echo "$fspec" if [[ -f ${fspec} ]] ; then ..... processing logic else ... processing logic fi done

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  • Regarding Unix shell script

    - by arav
    I want to retrieve the file from the INFILE directory which are begining with the file names prefix "BBSCGG_" or "BCT_" or "ACL_" or "ASC" and do the processing inside the for loop INFILE=/ext/test/fil1/ for infile name in file prefix ... if [[ -f ${fspec} ]] ; then processing logic else processing logic done how can i do it

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  • shell script output in html + email that html

    - by Kimi
    Using Solaris I have a monitoring script that uses other scripts as plugins. Theses pugins are also scripts which work in difffernt ways like: 1. Sending an alert while high memory uilization 2. High Cpu usage 3. Full disk Space 4. chekcking the core file dump Now all this is dispalyed on my terminal and I want to put them in a HTML file/format and send it as a body of the mail not as attachment. Thanks .

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  • How do i compare 2 strings in shell?

    - by Thomas
    I want the user to input something at the command line either -l or -e. so e.g. $./report.sh -e I want an if statement to split up whatever decision they make so i have tried... if [$1=="-e"]; echo "-e"; else; echo "-l"; fi obviously doesn't work though Thanks

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  • Shell script to copy files

    - by Hulk
    If there exist a directory, /backup/ And the files in it are a.gz b.gz c.gz And another directory /backup-directorybackup And the files in it are a.gz I need a shells script to compare two directories if the files are present then ignore it and if the filesare not present copy it to the destination directory Thanks..

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  • Korn Shell - Test with variable that may be not set

    - by C. Ross
    I have the following code in KornShell FAILURE=1 SUCCESS=0 isNumeric(){ if [ -n "$1" ]; then case $1 in *[!0-9]* | "") return $FAILURE; * ) return $SUCCESS; esac; else return $FAILURE; fi; } #... FILE_EXT=${FILE#*.} if [ isNumeric ${FILE_EXT} ]; then echo "Numbered file." fi #... In some cases the file name not have an extension, and this causes the FILE_EXT variable to be empty, which causes the following error: ./script[37]: test: 0403-004 Specify a parameter with this command. How should I be calling this function so that I do not get this error?

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  • UNIX Programs (Shell Scripting) [closed]

    - by atif089
    Hi, I have an exam tomorrow and I need some help with these programs. Or if you can tell me where I can get these. Write a program which uses grep to search a file for a pattern and display search patterns on standard output Write an awk program to print only odd numbered lines of a file. Write a program to open the command ls and give the output to the command through which we count the number of files Thank You :)

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  • Understanding the workflow of the messages in a generic server implementation in Erlang

    - by Chiron
    The following code is from "Programming Erlang, 2nd Edition". It is an example of how to implement a generic server in Erlang. -module(server1). -export([start/2, rpc/2]). start(Name, Mod) -> register(Name, spawn(fun() -> loop(Name, Mod, Mod:init()) end)). rpc(Name, Request) -> Name ! {self(), Request}, receive {Name, Response} -> Response end. loop(Name, Mod, State) -> receive {From, Request} -> {Response, State1} = Mod:handle(Request, State), From ! {Name, Response}, loop(Name, Mod, State1) end. -module(name_server). -export([init/0, add/2, find/1, handle/2]). -import(server1, [rpc/2]). %% client routines add(Name, Place) -> rpc(name_server, {add, Name, Place}). find(Name) -> rpc(name_server, {find, Name}). %% callback routines init() -> dict:new(). handle({add, Name, Place}, Dict) -> {ok, dict:store(Name, Place, Dict)}; handle({find, Name}, Dict) -> {dict:find(Name, Dict), Dict}. server1:start(name_server, name_server). name_server:add(joe, "at home"). name_server:find(joe). I tried so hard to understand the workflow of the messages. Would you please help me to understand the workflow of this server implementation during the executing of the functions: server1:start, name_server:add and name_server:find?

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  • rabbitmq-erlang-client, using rebar friendly pkg, works on dev env fails on rebar release

    - by lfurrea
    I am successfully using the rebar-friendly package of rabbitmq-erlang-client for a simple Hello World rebarized and OTP "compliant" app and things work fine on the dev environment. I am able to fire up an erl console and do my application:start(helloworld). and connect to the broker, open up a channel and communicate to queues. However, then I proceed to do rebar generate and it builds up the release just fine, but when I try to fire up from the self contained release package then things suddenly explode. I know rebar releases are known to be an obscure art, but I would like to know what are my options as far as deployment for an app using the rabbitmq-erlang-client. Below you will find the output of the console on the crash: =INFO REPORT==== 18-Dec-2012::16:41:35 === application: session_record exited: {{{badmatch, {error, {'EXIT', {undef, [{amqp_connection_sup,start_link, [{amqp_params_network,<<"guest">>,<<"guest">>,<<"/">>, "127.0.0.1",5672,0,0,0,infinity,none, [#Fun<amqp_auth_mechanisms.plain.3>, #Fun<amqp_auth_mechanisms.amqplain.3>], [],[]}], []}, {supervisor2,do_start_child_i,3, [{file,"src/supervisor2.erl"},{line,391}]}, {supervisor2,handle_call,3, [{file,"src/supervisor2.erl"},{line,413}]}, {gen_server,handle_msg,5, [{file,"gen_server.erl"},{line,588}]}, {proc_lib,init_p_do_apply,3, [{file,"proc_lib.erl"},{line,227}]}]}}}}, [{amqp_connection,start,1, [{file,"src/amqp_connection.erl"},{line,164}]}, {hello_qp,start_link,0,[{file,"src/hello_qp.erl"},{line,10}]}, {session_record_sup,init,1, [{file,"src/session_record_sup.erl"},{line,55}]}, {supervisor_bridge,init,1, [{file,"supervisor_bridge.erl"},{line,79}]}, {gen_server,init_it,6,[{file,"gen_server.erl"},{line,304}]}, {proc_lib,init_p_do_apply,3, [{file,"proc_lib.erl"},{line,227}]}]}, {session_record_app,start,[normal,[]]}} type: permanent

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  • Bash Shell Scripting - How to iterate through directories, and copy and rename files?

    - by Cypher
    I have a directory setup as follows: /hosted/partner1/logo.png /hosted/partner2/logo.png /hosted/partner3/logo.png /hosted/partner4/logo.png /hosted/partner5/logo.png ..etc. I want to write a script that can COPY those files to a different location, with a different file name, like this: /partners/partner1.png /partners/partner2.png /partners/partner3.png ..etc. Any ideas? I'm not so great with shell scripting and there are a lot of files that I need to migrate to a single directory...

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  • Erlang function does not exist in module?

    - by Sepehr Samini
    In lager.elr (the main module of https://github.com/basho/lager) there is no function with name "debug" but I have an application that call debug function from lager module like: lager:debug(Str, Args) I am beginner in Erlang but I know when we call a function from a module lile "mymodule:myfunction" there should be a function with name "myfunction" in file mymodule.erl but in this case when I search in lager.erl for function "debug" I can't find it.

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  • Is there a full REPL for Erlang?

    - by Gabriel Cuvillier
    Is there a way to have a full interpreter in Erlang, not just a "shell". Since it is a dynamic language, not being able to define named functions in the interpreter is a little bit disappointing... I suspect that it is because compilation units (modules) must be explicitly compiled for their execution by the VM, but maybe a REPL acting as a dynamic/recompilable module exist?

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  • erlang node not responding

    - by vinnitu
    I received such message in erlang condose at first@localhost node =ERROR REPORT==== 1-Jan-2011::23:19:28 === ** Node 'second@localhost' not responding ** ** Removing (timedout) connection ** My question is - what is timeout in this case? How much time before causes this event? Howto prevent this "horror"? I can restore\recover to normal work only by restart node... But what is the right way? Thank you, and Happy New Year!

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  • Erlang Facebook Example

    - by werg
    Does anyone know of an example facebook app (or facebook connect app) done in Erlang? I'm looking for something that includes the whole process. Specifically I don't seem to find anything on user authentication. I've checked out erlang_facebook, erlang2facebook and erlyface but none of them seem to offer a simple and comprehensive example accessible to me as a beginner . I'd be happy for just a bit of code to plough through though, preferably using mochiweb as backend.

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  • Erlang: HTTP Accept Header with Inets

    - by Ted Karmel
    I am trying to do the equivalent of the following curl command : curl -H "Accept: text/plain" http://127.0.0.1:8033/stats I tried with an Inets simple http request. But, it isn't processed. How can I specify in Inets (or some other Erlang http client for that matter) the accept header requirement?

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  • Why did you decide "against" using Erlang?

    - by Zubair
    Have you actually "tried" (means programmed in, not just read an article on it) Erlang and decided against it for a project? If so, why? Also, if you have opted to go back to your old language, or to use another functional language like F#, Haskell, Clojure, Scala, or something else then this counts too, and state why.

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