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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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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…

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How to bundle bash completion with a program and have it work in the current shell?

- by extempore

I sweated over the question above. The answer I'm going to supply took me a while to piece together, but it still seems hopelessly primitive and hacky compared to what one could do were completion to be redesigned to be less staticky. I'm almost afraid to ask if there's some good reason that completion logic seems to be completely divorced from…

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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…

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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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TAB completion not working in ubuntu hardy heron

- by Tutul

I have recently installed ubuntu hardy and found that shell command completion with TAB doesn't work, the package 'bash-completion' is installed in my system. I guess it is related to dash being the default shell? Is there a way to use tab completion in dash? If there isn't a way then how can i change my default shell to bash?

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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…

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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…

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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…

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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…

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HISTCONTROL=ignoreboth not working debian lenny

- by Mike

Can anybody confirm if by setting the the following env 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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Why can't I read or write a file whose owner is root and permission is 707 in Terminal.app on Snow L

- by lululau

This is what happens - but why? liuxiang@MacBookPro: ~/casecode/sh $ ls -l sa -rwx---rwx 1 root admin 55 10 21 00:07 sa liuxiang@MacBookPro: ~/casecode/sh $ cat sa cat: sa: Permission denied liuxiang@MacBookPro: ~/casecode/sh $ date >> sa -bash: sa: Permission denied liuxiang@MacBookPro: ~/casecode/sh $ ./sa…

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different .bashrc files for different login nodes?

- by 130490868091234

Can I have different .bashrc files loading when logging into different nodes that share the same home dir? This is, I am mostly interested to loading different PATH directories when logging as bash, depending on the different Linux nodes I log into? For example, if I log into bash in machine abc-01, I would like to…

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cygwin, PATH problem?

- by jayjaypg22

I run a .ksh containing a awk call. awk.exe and his shortcut awk is in /bin/awk, /bin is in the PATH environment variable. But when I try to launch awk, I have this error message : bash: /usr/bin/awk: no such file or directory Why didn't bash look for it in the /bin folder too? edit : tar has the same rights,…

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What's at Risk with Switching to ZSH?

- by Yar

Most advice for Mac is written assuming you use the Bash shell. If I switch to zsh, how incompatible do I become with current Bash scripts that I have on my system, and advice people on SU give me? Does the #!/bin/sh line at the beginning of my scripts help?

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Clearing terminal

- by sldkjalsdjk

Hi folks, I would like to issue a command from a bash script to clear the terminal it is running from: -I don't want to clear the bash history (history -c) -I don't want to issue the clear command (which moves the terminal down to the last prompt, giving the impression the terminal has been cleared, but previous…

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cygwin, PATH problem?

- by jayjaypg22

I run a .ksh containing a awk call. awk.exe and his shortcut awk is in /bin/awk, /bin is in the PATH environment variable. But when I try to launch awk, I have this error message : bash: /usr/bin/awk: no such file or directory Why didn't bash look for it in the /bin folder too? edit : tar has the same rights,…

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Invoking MSYS bash from Windows cmd

- by daevius

I'm using GCC on Windows7 (using the TDM's build). I installed MSYS to be able to execute make and compile using makefiles. However, it is tedious to every time start up the MSYS bash shell, navigate to the directory of the project and run make. What I want is to automate this process. I prefer to have a batch…

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A question about the cobbler-ubuntu-import bash script

- by user183394

I have been testing the latest cobbler for PXE booting Ubuntu 12.04.1-server-x86_64 and 12.10-server-x86_64 using a Scentific Linux 6.3 host to run the cobbler server. With the former, I got everything going. But with the later, I haven't been successful. As an attempt to figure things out, I downloaded…

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