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Search found 4783 results on 192 pages for 'bash completion'.

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• AWK: how to read columnwise file to AWK-script in Bash?

  - by HH

  $ cat read.sh #!bin/bash // how can I read the columnwise data to awk-script? awk '{sum+=$1} END {print sum}' read $ cat data 1 2 3 4 5 $ . ./read.sh <data awk: cmd. line:1: fatal: cannot open file `read' for reading (No such file or directory)

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• Automatically timing every executed command and show in Bash prompt?

  - by mfn

  I often happen to forget to explicitly prefix executions with the "time" command, ideally I would see in the next shell prompt how much real time the last command took (on every command). I already scoured through the bash documentation, but couldn't find anything related.

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• Loading variables from a text file into bash script.

  - by S1syphus

  Is it possible to load new lines from a text file to variables in bash? Text file looks like? EXAMPLEfoo EXAMPLEbar EXAMPLE1 EXAMPLE2 EXAMPLE3 EXAMPLE4 Variables become $1 = EXAMPLEfoo $2 = EXAMPLEbar ans so on?

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• Bash: how to process variables from an input file?

  - by gilgongo

  I've got a bash script that reads input from a file like this: while IFS="|" read -r a b do echo "$a something $b somethingelse" done < "$FILE" The file it reads looketh like this: http://someurl1.com|label1 http://someurl2.com|label2 However, I'd like to be able to insert the names of variables into that file when it suits me, and have the script process them when it sees them, so the file might look like this: http://someurl1.com?$VAR|label1 http://someurl2.com|label2 So $VAR could be, for example, today's date, producing an output like this: http://someurl1.com something label1 somethingelse http://someurl2.com?20100320 something label2 somethingelse

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• In the bash script how do I know the script file name?

  - by Ma99uS

  How can I determine the name of the bash script file inside the script itself? Like if my script is in file runme.sh, than how would I make it to display "You are running runme.sh" message without hardcodding that? Thanks,

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• How to store and echo multiple lines elegantly in bash?

  - by EmpireJones

  I'm trying to capture a block of text into a variable, with newlines maintained, then echo it. However, the newlines don't seemed to be maintained when I am either capturing the text or displaying it. Any ideas regarding how I can accomplish this? Example: #!/bin/bash read -d '' my_var <<"BLOCK" this is a test BLOCK echo $my_var Output: this is a test Desired output: this is a test

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• How do I pass a Python Variable to Bash?

  - by user336537

  Hello, How would I pass a Python variable to the Bash shell? It should work like this: foo="./RetVar.py 42" Replace the double-quotes with `s I have tried printing and sys.exiting the result, but to no avail. How would I accomplish my goal?

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• In Bash, how do you access command line arguments inside a function?

  - by DonGar

  I'm attempting to write a function in bash that will access the scripts command line arguments, but they are replaced with the positional arguments to the function. Is there any way for the function to access the command line arguments if they aren't passed in explicitly? # Demo function function stuff { echo $0 $* } # Echo's the name of the script, but no command line arguments stuff # Echo's everything I want, but trying to avoid stuff $*

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• How do I write a bash script to restart a process if it dies?

  - by Tom

  I have a python script that'll be checking a queue and performing an action on each item: # checkqueue.py while True: check_queue() do_something() How do I write a bash script that will check if it's running, and if not, start it. Roughly the following pseudo code (or maybe it should do something like ps | grep?): # keepalivescript.sh if processidfile exists: if processid is running: exit, all ok run checkqueue.py write processid to processidfile I'll call that from a crontab: # crontab */5 * * * * /path/to/keepalivescript.sh Thanks in advance.

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• What is your single most favorite command-line trick using Bash?

  - by hoyhoy

  We all know how to use <ctrl>-R to reverse search through history, but did you know you can use <ctrl>-S to forward search if you set stty stop ""? Also, have you ever tried running bind -p to see all of your keyboard shortcuts listed? There are over 455 on Mac OS X by default. What is your single most favorite obscure trick, keyboard shortcut or shopt configuration using bash?

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• How to get the line non-empty of a file using tail ? Bash

  - by debugger

  Do you have an idea how to get the last line non-empty using tail in bash ? For example my_file.txt will be as following: hello hola bonjour (empty line) (empty line) Obviously if i do tail -n 1 my_file.txt i will get an empty line. In my case i want to get bonjour Any clues? Thanks Debugger

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• Is there a good free (prefrerably PDF) bash tutorial online?

  - by morpheous

  I am finding myself doing a lot more messing around with scripts than I used to and my lack of knowledge in this area (and linux sysadmin/security in general), is becoming a hindrance. Can anyone recommend a good online resource for bash scripting/linux admin. Preferably, it will be in pdf format, so I can copy it (single file) onto my PDA.

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• How do I get the last non-empty line of a file using tail in Bash?

  - by debugger

  How do I get the last non-empty line using tail under Bash shell? For example, my_file.txt looks like this: hello hola bonjour (empty line) (empty line) Obviously, if I do tail -n 1 my_file.txt I will get an empty line. In my case I want to get bonjour. How do I do that?

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• How to suppress Terminated message after killing in bash?

  - by emergence

  How can you suppress the 'Terminated' message that comes up after you kill a process in a bash script? I tried set +bm, but that doesn't work. I know another solution involves calling 'exec 2 /dev/null', but is that reliable? How do I reset it back so that I can continue to see stderr? Thanks

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• How do I use a file grep comparison inside a bash if/else statement?

  - by openid_kenja

  When our server comes up we need to check a file to see how the server is configured. We want to search for the following string inside our /etc/aws/hosts.conf file: MYSQL_ROLE=master Then, we want to test whether that string exists and use an if/else statement to run one of two options depending on whether the string exists or not. What is the BASH syntax for the if statement? if [ ????? ]; then #do one thing else #do another thing fi

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• How to print value of a variable (which can be "-n" or "-e") in bash?

  - by Vi

  How to print "-n", "-e" or "-neeenen" from bash (without a newline at the end, without invoking of external programs)? Q="-n" echo -n "$Q" # fail echo -- "$Q" # fail cat <<< "$Q" # fail, also starts external program printf -- '%s' "$Q" # success, but starts external program

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• How do I rebuild a corrupt dpkg status file?

  - by Ramón

  Whenever I type sudo apt-get remove and then press the Tab key for auto-completion I get the following message: grep-status: /var/lib/dpkg/status:15945: expected a colon. I don't see anything especially strange at line 15945 in the status file. It's a dot character in the description field of a mono library package and inserting a colon did not help. Removing the line containing the dot did not work either. Overwriting the file with status-old resulted in the same message. Is there some way to rebuild the status file?

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• How to add Auto-completion to notepad++ for Objective-C

  - by Comptrol

  I know there exist XML files for auto-completion in notepad++\plugins\apis directory. But Objective-C doesn't exist there. So, I wonder if you have any xml file or any other solution for this? Thanks in advance.

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• Linux and I/O completion ports?

  - by someguy

  Using winsock, you can configure sockets or seperate I/O operations to "overlap". This means that calls to perform I/O are returned immediately, while the actual operations are completed asynchronously by separate worker threads. Winsock also provides "completion ports". From what I understand, a completion port acts as a multiplexer of handles (sockets). A handle can be demultiplexed if it isn't in the middle of an I/O operation, i.e. if all its I/O operations are completed. So, on to my question... does linux support completion ports or even asynchronous I/O for sockets?

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• Any tips on switching from bash to zsh if often using shell inside of emacs?

  - by justingordon

  Related to this question: Advantages and disadvantages between zsh and emacs' (e)shell, I've read some great things about zsh, when using M-x shell, my familiar emacs shell seemed like it would need some customizations. I also use evil-mode in shell mode, so that means I use vi keystrokes for shell editing. Took a little while to get accustomed to this, but I really like it. Any advice or tips on going from bash to zsh if one uses emacs? Or better off adding the file completion mentioned in this question: Worth switching to zsh for casual use?.

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• Shell script issue: cron job script to Restart MySQL server when it stops accidentally

  - by Straw Hat

  I have this script, I am using it to setup CRON job to execute this script, so it can check if MySQL service is running; if not then it restart the MySQL service: #!/bin/bash service mysql status| grep 'mysql start/running' > /dev/null 2>&1 if [ $? != 0 ] then sudo service mysql restart fi I have setup cron job as. sudo crontab -e and then added, */1 * * * * /home/ubuntu/mysql-check.sh Problem is that it restart MySQL on every cron job execution.. even if server is running it restart the MySQL service what is correction in the script to do that.

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• Check connection and reconnect wifi

  - by Ruud

  I'm building a wireless photoframe. The one thing I haven't been able to figure out is how to get my wifi connection back up using a recommended method. Right now I edited /etc/network/interfaces so wlan0 is started at boot: auto wlan0 iface wlan0 inet dhcp wireless-essid ourssid This method works fine for booting. But I found that if I do not check the connection for a long time (could be a week) it might be down. So I should reconnect. What I do now to verify the connection is working is downloading a file from the server that can't be cached (http://server.ext/ping.php?randomize=123456) If I fail to retrieve the file I assume that the connection is no longer working and I run a shell script like #!/bin/bash ifconfig wlan0 up iwconfig wlan0 essid "ourssid" dhclient wlan0 And the connection comes back. But I can't find anything if this is in any way a good method. Can this be improved upon, or is this already right?

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• cd command not working anymore

  - by dystroy

  I just did two things : install scm_breeze and mercurial : git clone git://github.com/ndbroadbent/scm_breeze.git ~/.scm_breeze ~/.scm_breeze/install.sh sudo apt-get install mercurial And now my cd command seems to be gone : dys@dys-tour:~/prog> cd ~ bash: /home/dys : is a folder dys@dys-tour:~/prog> cd .. .. : command not found The terminals I opened before installing scm_breeze and mercurial are fine. The terminals I open now have the problem. I uninstalled scm_breeze, with no result. What can I do to diagnose the problem and fix it ?

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• How can I install a specific older version of Firefox and keep it from automatically updating?

  - by Matt V.

  I wrote a bash script to configure a suite of tools for continuous integration on top of Ubuntu 10.04.2. The script recently stopped working and I tracked the problem down to the newer version of Firefox that was just released. The image of Ubuntu that I'm starting with already has Firefox installed, but I need a version in between what it comes with and the latest. Here's the code I was using: sudo add-apt-repository ppa:mozillateam/firefox-stable sudo apt-get update echo "y" | sudo apt-get install firefox How can I instead install Firefox 7.0.1 and keep it from automatically upgrading to the latest version? If I can, I'd like to avoid installing Firefox manually, so I can more easily use apt-get later, once the issue I'm running into gets resolved.

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• Cannot execute binary file

  - by user291727

  I am new to Ubuntu and I'm trying to install Popcorn Time. I downloaded 32 bit version and tried to install it but that's where the problem started showing. I duble clicked the executable file and well, nothing happened. It's a official download from their web-site but it doesn't work. Maybe I'm doing something wrong.....Anyway, I found out that you can insatll it from a script, but people keep talking in ubuntu terms and I don't understand it, so I have a few questions: 1.How to make a script? (witch I'm suppose to run in terminal using bash comand), 2.Is it normal that i cannot run the installer, and if that is an installer or just files for the program. 3.If it is an installer, how do I make it work? 4.What does " Cannot execute binary file" mean? Thank you in advance, hope I'm not asking too many questions(please understand that I'm new to ubuntu) and sorry about my English. xD

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