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• What's shell script's advantage over interpreted programming languages?

  - by Lai Yu-Hsuan

  (I'm not sure if it's a appropriate question here) Shell script, like bash, can do many things. It can call Unix programs, pipe their output, redirect I/O from/to files, control flow, check whether a file exists, etc. But a modern programming language, e.g, python and ruby, can also do these all. And their are (I think) more readable and maintainable. bash is worldwide spreaded. But many distributions have installed python interpreter, too. So what's the advantage of shell script? If I could write python, ruby or perl, is it worth to learn bash?

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• ATI graphics card, with gnome shell, screen flickers

  - by bioShark

  After installing gnome shell, without any problem, after log in the fonts are missing and it looks like crap...nothing is readable. Don't want to make it a double post, because my issue is similar to the one from this question but for me the problems have not been solved properly. After running the commands from that post, and installing the latest AMD 11.10 driver, the Gnome shell display issues have been solved. But each time I move the mouse in the upper left corner, to bring up the applications...my entire screen flickers. Without the applications been displayed, everything looks fine. Hardware: ATI HD4870, Intel Q6600.

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• New windows from the dock in Gnome Shell

  - by Andrea

  I am using Gnome Shell on Ubuntu 11.10, and I frequently use workspaces, as the shell encourages to do. My only complaint is that it is slow to place different windows of the same program in different workspaces. What I would like to do: click on an empty workspace, click on the Nautilus icon in the dock and browse to the correct folder. Then click on another empty workspace, click on the Nautilus icon and so on. This does not work: the second time I open Nautilus, the dock lets me switch to the previous instance, which is almost never what I want. So I have to click on the Nautilus icon, open a new window, place it on a different desktop, switch to that folder and finally browse to the correct folder. Is there a way to simplify this flow? It would be even better if I was able to link a specific folder from the dock, or better yet to have something similar to a Unity lens, where I can choose between the most used folders.

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• How to disable Gnome-Shell auto-open in Dashboard

  - by user48027

  I am personalising my Gnome-Shell in Ubuntu 11.10 I would like to disable the feature to open the Gnome's Dashboard when I close the last Window in a Workspace. Edit to clarify: The dashboard is available only in GNOME Shell. The dashboard opens if you press the windows key (aka SUPER) or if you move the mouse to the upper left corner. If you close the last window of a workspace, but there are open windows on other workspaces, the dashboard opens automatically. The latter behaviour is annoying if you do not want to use the dashboard to open new windows or to change workspace. There are many ways to to both (Gnome do, Docky, keyboard shortcuts, clicking on something on the desktop, ...). Edit: There is a related Q&A, which was closed because the asked the same question for Mint: How can I prevent the activity view for opening when I close the last running app?

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• Writing a basic C Shell - understanding argv[] [on hold]

  - by Flame

  I have an assignment for my class to write a basic C Shell. I have found many pages that explain parts of it and some fully implemented code. I'm not going to copy, i'm just using it right now as a way to get started. So I'm at the beginning of this project obviously. One example I am looking at parses the user's input and stores a pointer to the beginning of the argument in char *argv[3]; Am I just misunderstanding this or would this technically break if there are more than 3 arguments? (say /a.out arg1 arg2 arg3 etc). Would I wanna malloc this somehow? I know a.out is considered argv[0], and the arguments argv1 - however many there are. It's probably bad practice to have too many arguments for a program, but I still would at least want to address it as I don't know what my TA's are going to use to test my shell.

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• Is there a way to prevent output from backgrounded tasks from covering the command line in a shell?

  - by Chris Pick

  I would like to be able to run task(s) in the background of a shell and not have their output to stdout or stderr cover the command line at the bottom. Frequently I need to run other commands to interact with the background processes and would like to do so from the same shell without having to open up another terminal or using multiplexer to split the terminal like screen. Ideally there would be some setting that I just don't know about (I commonly use bash or ksh), but a new or different shell or a script would be fine by me. I'm open to any suggestions and appreciate any help, thanks.

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• How to delay putting process in background until after it is ready to serve, in shell

  - by Jakub Narebski

  I have two processes: a server that should be run in background, but starts serving requests after a delay, and a client that should be started when server is ready. The server prints line containg "Acceptin connections" to its stderr when ready (server stderr is redirected to a file when running it in background). How to delay putting server process in background until server is ready to serve requests? Alternatively, how to delay running client until server is ready? Language: shell script (or optionally Perl).

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• Replace text from a MySQL dump using cat (or something else) in shell

  - by Cy

  I've got a database dump in MySQL where I want to replace ocurrencies of paths that are in the dump as plaintext. In this particular case I'd like to replace: /var/www/ for /home/www/ How could I safely do that using cat or any other shell tool?

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• Getting the last argument passed to a shell script

  - by Thomas

  $1 is the first argument. $@ is all of them. How can I find the last argument passed to a shell script?

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• replace a particular text in all the files using single line shell command

  - by developer

  i have a renamed js file which i have to call in each of my php page. Now i want to replace that old name with the new one using shell. what iam using is this :- sed -i ’s/old/new/g’ * but this is giving the following error :- sed: -e expression #1, char 1: unknown command: now how can i do this replacement??

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• Good book for learning Bash shell?

  - by John Isaacks

  I want to learn how to write shell scripts. Particularly I want to write a svn post-commit script to upload files from a test server to a production server. I am sure I will want to write more as I get more into it. I have very little linux/unix knowledge. Can anyone recommend a good book?

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• Parsing result of Diff in Shell Script

  - by Saobi

  I want to compare two files and see if they are the same or not in my shell script, my way is: diff_output=`diff ${dest_file} ${source_file}` if [ some_other_condition -o ${diff_output} -o some_other_condition2 ] then .... fi Basically, if they are the same ${diff_output} should contain nothing and the above test would evaluate to true. But when I run my script, it says [: too many arguments On the if [....] line. Any ideas?

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• idioms for returning multiple values in shell scripting

  - by Wang

  Are there any idioms for returning multiple values from a bash function within a script? http://tldp.org/LDP/abs/html/assortedtips.html describes how to echo multiple values and process the results (e.g., example 35-17), but that gets tricky if some of the returned values are strings with spaces in. A more structured way to return would be to assign to global variables, like foo () { FOO_RV1="bob" FOO_RV2="bill" } foo echo "foo returned ${FOO_RV1} and ${FOO_RV2}" I realize that if I need re-entrancy in a shell script I'm probably doing it wrong, but I still feel very uncomfortable throwing global variables around just to hold return values. Is there a better way? I would prefer portability, but it's probably not a real limitation if I have to specify #!/bin/bash.

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• Reading into directory, unix shell script

  - by dubya

  I am trying to analyze the files/directories inside of a directory using a shell script, for example if the file is readable, if it is a file, if it is a directory, etc. My script is set up to take a directory as input. so I would type 'file.sh directoryname'. However, when I create a for loop to analyze the files, it analyzes the files in my current working directory rather than the specified directory name. This is my broken code: file=$1 set mypath = $file for file in $mypath * do if [ -d $file ] dirCount=`expr $dirCount + 1` fi done Why does this read the working directory instead of the specified directory? Any help is appreciated. Thanks

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• Create database in Shell Script - convert from PHP

  - by snaken

  I have the following PHP code that i use to create a databaase and grant permissions to a user: $con = mysql_connect("IP.ADDRESS","user","pass"); mysql_query("CREATE DATABASE ".$dbuser."",$con)or die(mysql_error()); mysql_query("grant all on ".$dbuser.".* to ".$dbname." identified by '".$dbpass."'",$con) or die(mysql_error()); I want to perform these same actions but from within a shell script. Is it just something like this: MyUSER="user" MyPASS="pass" MYSQL -u $MyUSER -h -p$MyPASS -Bse "CREATE DATABASE $dbuser;' MYSQL -u $MyUSER -h -p$MyPASS -Bse "GRANT ALL ON ${DBUSER}.* to $DBNAME identified by $DBPASS;"

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• Shell script to count files, then remove oldest files

  - by Nic Hubbard

  I am new to shell scripting, so I need some help here. I have a directory that fills up with backups. If I have more than 10 backup files, I would like to remove the oldest files, so that the 10 newest backup files are the only ones that are left. So far, I know how to count the files, which seems easy enough, but how do I then remove the oldest files, if the count is over 10? if [ls /backups | wc -l > 10] then echo "More than 10" fi

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• Cannot install gnome shell extensions

  - by gnome

  I upgrade from 10.04 to 12.04, install gnome 3 and remove unity. My gnome version is 3.4.1. The GNOME Shell extensions is installed and enabled. When I use firefox to visit each extension page in https://extensions.gnome.org/, for example, https://extensions.gnome.org/extension/5/alternative-status-menu/, there is no where to install the extensions. I am told that one can install extensions by visite these extension pages. This is the guide I followed.

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• Simultaneously execute two queries on a shell script

  - by Alex

  I have a shell script in which I have to execute two queries (on different databases), spool their results to text files and finally call a c++ program that processes the information on those text files. Something like this: sqlplus user1/pw1@database1 @query1.sql sqlplus user2/pw2@database2 @query2.sql ./process_db_output Both queries take some time to execute. One of them can take up to 10 minutes, while the other one is usually faster. What I want to do is execute them simultaneously and when both are done, call the processing utility. Any suggestion on how to do so?

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• Prevent gnome-shell's dash from listing Recent Items

  - by Vivek

  I am using gnome-shell in Ubuntu 11.10. I am getting annoyed when dash search lists Recent Items. I have tried many ways to prevent it like Deleting activity.sqlite and activity.sqlite-journal files under ~/.local/share/zeitgeist Adding all the possible entries in Activity Log Manager to prevent application logging Specifying time range in Activity Log Manager to forget my activities. But none of the methods are working. The recent items list is still populated. Is there any way to tell dash not to list Recent Items while searching, other than the above methods? Or is there any way to delete the recent items list?

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• How to add a printer in gnome-shell

  - by artfulrobot

  I'm using Gnome Shell (although I'm not sure whether the "Printers" app is part of that or just part of Gnome). I go to "Printers" from the overview, click the + button on the bottom left, choose network and then see a message "FirewallD is not running. Network printer detection needs services mdns, ipp, ipp-client and samba-client enabled on firewall.". It's not auto detected anything. There's an Address box and a Search by Address tickbox, but neither seem to do anything. I'm frustrated because I know all the details of the printer, but have nowhere to put them in. Automation is supposed to make things easier, no? For example I know the printer is at lpd://10.67.5.3/lp1 but I can't put this in anywhere. Is there a GUI that works, or have I misunderstood how to use it?

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• Developing gnome shell extensions with eclipse as a IDE

  - by GAP

  I would like to know whether any body has used Eclipse JavaScript support for developing gnome-exensions. Actually aiming here for the context support which is available in eclipse. And i though if i could add all the java scripts that a extension is inheriting (base scrips) in to a user library, then i could included it as a dependency in my extension project. Have any once done this already ? Does all the methods that are used in a exentions exist in the base scripts ? In what directories does the base scripts exist ? So far i tried adding the scripts in the following directory but still i have error when i try to look at the journal gnome extension code. /usr/share/gnome-shell/js /usr/share/gjs-1.0 Thanks

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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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