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• How to retrieve the first word of the output of a command in bash?

  - by Neuquino

  I have a command, for example: echo "word1 word2". I want to put a pipe (|) and get word1 from the command. echo "word1 word2" | .... I don't know what to put after the pipe... Thanks in advance

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• dismissViewControllerAnimated completion block presenter view and modal view flow

  - by Patricia LaRue

  I did find an answer to this title and I did do a little research but I'm still not getting the flow. Here is what I want to happen: 1) click a button on the presenter view to open a modal view. 2) retrieve some value and click a button to close the modal view....sending the value to the presentor view and execute a method. I get that this works like a callback but I still can't figure out where to put the callback stuff. So, how exactly do I do this? A) In the presentViewController completion block, should I include the presenter view method to execute when modal view is completed? Or: B) In the modal view's dismissViewControllerAnimated completion block, should I include the presenter view method to execute when modal view is completed? Can somebody help me with some sample code? Or at least help me get the flow of which block to put the code in? Thank you, P

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• Why 0 is true but false is 1 in bash?

  - by httpinterpret

  false; echo $? The above will output 1,which is contradictory with all other programming languages I know. Any reason in this?

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• How to use the .* wildcard in bash but exclude the parent directory (..)?

  - by Allan

  There are often times that I want to execute a command on all files (including hidden files) in a directory. When I try using chmod g+w * .* it changes the permissions on all the files I want (in the directory) and all the files in the parent directory (that I want left alone). Is there a wildcard that does the right thing or do I need to start using find?

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• Bash: Is it ok to use same input file as output of a piped command?

  - by Amro

  Consider something like: cat file | command > file Is this good practice? Could this overwrite the input file as the same time as we are reading it, or is it always read first in memory then piped to second command? Obviously I can use temp files as intermediary step, but I'm just wondering.. t=$(mktemp) cat file | command > ${t} && mv ${t} file

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• How do you run multiple programs from a bash script?

  - by Betamoo

  I am trying to write a .sh file that runs many programs simultaneously I tried this prog1 prog2 But that runs prog1 then waits until prog1 ends and then starts prog2... So how can I run them in parallel? Thanks

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• Parallel processing from a command queue on Linux (bash, python, ruby... whatever)

  - by mlambie

  I have a list/queue of 200 commands that I need to run in a shell on a Linux server. I only want to have a maximum of 10 processes running (from the queue) at once. Some processes will take a few seconds to complete, other processes will take much longer. When a process finishes I want the next command to be "popped" from the queue and executed. Does anyone have code to solve this problem? Further elaboration: There's 200 pieces of work that need to be done, in a queue of some sort. I want to have at most 10 pieces of work going on at once. When a thread finishes a piece of work it should ask the queue for the next piece of work. If there's no more work in the queue, the thread should die. When all the threads have died it means all the work has been done. The actual problem I'm trying to solve is using imapsync to synchronize 200 mailboxes from an old mail server to a new mail server. Some users have large mailboxes and take a long time tto sync, others have very small mailboxes and sync quickly.

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• Bash: Continue script if only one instance is running.

  - by Andrew

  Hello, now this is embarrassing. I'm writing quick script and I can't figure out why this statement don't work. if [ $(pidof -x test.sh | wc -w) -eq 1 ]; then echo Passed; fi I also tried using back-ticks instead of $() but it still wouldn't work. Can you see what is wrong with it? pidof -x test.sh | wc -w returns 1 if I run it inside of script, so I don't see any reason why basically if [ 1 -eq 1 ] wouldn't pass. Thanks a lot!

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• How a script know his own name in bash?

  - by debugger

  I launch script.sh and inside it i want to know what is his name Is there a standard procedure to know the scripts name ? the idea is to be able to extract the name from teh full path + name contained in $0 Thanks

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• Can I use what I wrote on the shell (bash, cmd, irb, etc) in a script automaticaly?

  - by El_Hoy

  The general idea is pretty simple, I want to make a script for a certain task, I do it in the shell (any shell), and then I want to copy the commands I have used. If I copy all the stuff in the window, then I have a lot of stuff to delete and to correct. (and is not easy to copy from shell) Resume: I want to take all the things I wrote... Is there an easy way to do this easy task?

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• What is the difference between operator "=" and "==" in Bash ?

  - by debugger

  Hello All, It seems that these two operators realize pretty much same. So do you have any idea for the exact difference between the two ? When i need to use "=" and when "==" ?? Thank you, Debugger

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• What does the following line of a bash script do?

  - by Bialecki

  Usually work in Windows, but trying to setup RabbitMQ on my Mac. Can someone let me know what the line below does? [ "x" = "x$RABBITMQ_NODE_IP_ADDRESS" ] && [ "x" != "x$NODE_IP_ADDRESS" ] && RABBITMQ_NODE_IP_ADDRESS=${NODE_IP_ADDRESS} Specifically, I'm curious about the [ "x" = "x$RAB..."] syntax.

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• Weblogic server: Why response sent prior to post completion

  - by markn

  When analyzing traffic with a packet sniffer, we are seeing an http response from a weblogic server prior to the completion of the http post to that server. In this case, the jsp page on the server is basically a static page, no logic to do anything with the contents of the post at this time. But why would the server send the response prior to completion of the post? I found Weblogic documentation about how to configure the server to ignore a denial-of-service attack using Http post. Maybe that is what is happening? No one I know has seen this behaviour before. Maybe some weblogic-savvy person will know what is going on. Thanks

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• How do I set bash environment variables from a script?

  - by James A. Rosen

  I have some proxy settings that I only occasionally want to turn on, so I don't want to put them in my ~/.bash_profile. I tried putting them directly in ~/bin/set_proxy_env.sh, adding ~/bin to my PATH, and chmod +xing the script but though the script runs, the variables don't stick in my shell. Does anyone know how to get them to stick around for the rest of the shell session?

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• Bash Scripting: I want to open a set of .html files, and add line before html tag

  - by Bashn00b

  Hi guys, I have a set of .php files in a folder, I want to add text just before these lines: <!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd"> <html xmlns="http://www.w3.org/1999/xhtml" xml:lang="en" lang="en" > What i want is to insert just before these lines in the html file. So just want to prepend that file before each docType declaration. However the DOCTYPE declaration is never on line 1, as there is loads of php lines before. I have this current script (where FE is the folder containing all the scripts i want to edit): for file in ${fe}*; do echo "$file" done Thanks,

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• Round all numbers in file to equal length in Bash?

  - by liborw

  Hello, Is there easy way how to round floating numbers in a file to equal length? The file contains other text not only numbers. Thanks

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• How many different ways are there to get variable value in bash?

  - by user198729

  I found these two: [root@~]# echo $i; 2 [root@~]# echo ${i}; 2

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• How to test whether a specific user has the priviledge to modify a certain file using bash?

  - by user198729

  Is it possible to do this programmatically?

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• How to test whether a specific user (not current user) can modify a file in bash?

  - by user198729

  Is it possible to do this programmatically?

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• HISTCONTROL=ignoreboth not working Debian Lenny

  - by Mike

  Can anybody confirm if by setting the the following environmental variables under debian lenny will make previous history entries not to be saved. GNU bash, version 3.2.39(1)-release export HISTCONTROL=ignoreboth export HISTSIZE=500 I have added them to my /etc/bash.bashrc but I keep getting repeated commands. Thanks

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• socat and rich terminals (with Ctrl+C/Ctrl+Z/Ctrl+D propogation)

  - 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 be able to connect the shell to everything socat can handle (socks5, udp, openssl), but also to have a nice shell which correctly interprets all keys, various Ctrl+C/Ctrl+Z and jobs control. Update: Found "setsid" socat option. It fixes "no job control". Now trying to fix Ctrl+D.

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• socat and "no job control in this shell"

  - 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 be able to connect the shell to everything socat can handle (socks5, udp, openssl), but also to have a nice shell which correctly interprets all keys, various Ctrl+C/Ctrl+Z and jobs control. /* Requested tags: socat job-control */

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• Is it worth while to learn Awk?

  - by user41755

  I am decent with bash scripting and I am catching on to regex, and a little sed usage. Is learning awk still worth while with all the alternatives out there. I am kind of averse to using perl, I see it as dying, for some reason I feel like bash is more of a survivor. Opinions?

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• List of common ways those could shut down server unexpectedly ?

  - by SpawnCxy

  After running a bash fork bomb which made my webserver down, I think I should be more careful even not under root.I thought it would be totally fine while I'm not under root.So I ignored the warning and ran the bash fork bomb which is :() { :|:& }; : .(Please don't run it if u don't understand this code cuz it will make you system down).And I think I need a list of common ways those could cause a sever shutting down unexpectly even not under root. Any suggestion would be appreciated. Regards `

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• double-click to run .sh file

  - by Delirium tremens

  GUI: I changed the permissions of an sh file, so that I can read, write and execute it. I double-clicked it, selected run in Terminal, but it didn't run. I double-clicked it, selected run, but it didn't run. Command-Line: bash *filename* runs it sh *filename* runs it The file content is: #!/bin/bash # get dirsyncpro home DIRSYNCPRO_HOME="$(dirname $0)" # start programm and pass any parameters java -Xmx512M -jar "$DIRSYNCPRO_HOME/dirsyncpro.jar" $* Works in this person's computer: http://www.knowliz.com/2008/08/how-to-installrun-sh-file-in-linux.html What's going on?

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