rm -rf will fail if something tries to delete the same file tree (I think because rm enumerates the files first, then deletes). A simple test: # Terminal 1 for i in `seq 1 1000`; do mkdir -p /tmp/dirtest/$i; done # Now at teh same time in terminal 1 and 2 rm -rf /tmp/dirtest There will be so...

Unix environment has some excellent tools for parsing text in various forms. However off late the data is not in the regular set of formats(CSV,TSV,Record based or some other delimiter based) it used to be before. Data these days is exchanged in structured formats like XML's/JSON's. I know there...

Hi, I have a weird issue going on. I have a user account and I can login to Gnome normally. From a terminal there I can use su root and switch to root with my root password. However, when I try to login to Gnome as root, the same password does not work. Any assistance would be appreciated. Fedo...

Adding a line to multiple files in the same structure is not very hard, but I am stumped on how to do it over a possibly large directory tree structure. So lets say we have your project directory, which has hundreds of projects in it and you want to add a header to every *.c file. How can this b...

Under /sbin/start_udev How can i remove the [ OK ] To be printed. Im tryitng to change the /etc/rc.sysinit to display the information that i like, and i have managed to remove all the info outputs apart from the annoying [ OK ] Any ideas? Im using Fedora 13

The following script works on Ubuntu, but not on Mac. Why? How to edit it so that it would work there too? #!/bin/sh v=1.1 test_file="Test10.java" jar_file="dp4j-$v-jar-with-dependencies.jar" curl -O "http://repo2.maven.org/maven2/com/dp4j/dp4j/$v/$jar_file" # Start cat > $test_file <&l...

I need to see whole HTTP packets sent and recieved by an application for debugging purposes. How can this be done in command-line?

I am trying to integrate apache and tomcat. I thus want apache to forward requests to tomcat. I am using the mod_jk module for apache to achieve this. So far I am trying to get tomcat to auto-gen the configuration files for the mod_jk - I add the relevant to my server.xml <Listener classNam...

I would like this script to show just the "ok" or simply no output: if (ping -c 1 www.google.com) then (echo ok); fi Is there a way? -- using: if (ping -c 1 www.google.com > /dev/null) then (echo ok); fi it still shows ping: unknown host www.google.com when fails. I would like no outpu...

I'm curious about the security of leaving a root shell running inside a detached screen session. I typically never do this. Aside from the potential of my non-root user account being compromised (password exposed, ssh key compromised, etc), are there other vectors of entry into a detached, passw...

This is still being posted I will remove this message when the digest is complete The following is a "digest" version of the 2011 Moderator Election Town Hall Chat. The format, as described on Meta Stack Overflow, is one answer to this question for every question asked in the Town Hall,...

I would like to have the root account in safety even if my unprivileged user is compromised. On Ubuntu you can only use sudo for "security reasons" by default. However I am not sure it is any safer than just using login on a text-mode console. There are too many things that can go wrong if an at...

I have inherited a VAX system that was just migrated onto CHARON-VAX (VMS emulated on Windows) I can access it via ssh, but not with X. Anyone here familiar with DECwindows? is it X compliant? Or do I need a specific client to access it?

Good afternoon, I'm setting up a Cronjob that will backup a MySQL database I have in my server, but I don't want it to keep overwriting the same file over and over again. Instead, I want to have an array of backups to choose from, done automatically. For example: ## Cronjob, run May 21st, 2011:...

Is there a command that relaunch the application once it finishes from the command line? Letting you do something like: > relaunch python myapp.py If not, then what's my best option? I know I could cron it, but I'd be more interested in something I could just execute from the terminal and t...

What's the difference between export and setenv?

Hi, I have no experience with Linux. I'm looking for a distribution which is beginner friendly. Ubuntu looks great. My usage for this system will include web development, and possibly application development. However, I would prefer a system where I can design my own theme, alter the interfac...

I have VPS running Debian 5.0 (I think) and I would like to get it to run PHP files. I was told it needed to be configured with Apache. I tried entering the command apt-get install apache2 php5 libapache2-mod-php5. But there was no change. Console output: http://pastebin.com/sVMWq6mA My webserv...

I am executing every now and then some python scripts which take quite long to execute. I execute them like this: $ time python MyScript.py How can I play a sound as soon as the execution of the script is done? I use Ubuntu 10.10 (Gnome desktop).