That depends on your distribution. On some system, it’s deleted only when booted, others have cronjobs running deleting items older than n hours. On Ubuntu 14: using tmpreaper which gets called by /etc/cron.daily, configured via /etc/default/rcS and /etc/tmpreaper.conf. (Credits to this answer). On Ubuntu 16: using tmpfiles.d. (Credits to this answer). On other Debian-like systems: … Read more
Do you mean tail -f logfile.log ? (Man page for tail)
I would choose a consistent approach across the entire environment. Both solutions work fine and will remain compatible with most applications. There is a difference in manageability, though. I go with the short name as the HOSTNAME setting, and set the FQDN as the first column in /etc/hosts for the server’s IP, followed by the … Read more
To do this in a distro-independent* fashion you can use ldconfig with grep, like this: ldconfig -p | grep libjpeg If libjpeg is not installed, there will be no output. If it is installed, you will get a line for each version available. Replace libjpeg by any library you want, and you have a generic, … Read more
I have written a dns proxy in Python. It will read wildcard entries in /etc/hosts. See here: https://github.com/hubdotcom/marlon-tools/blob/master/tools/dnsproxy/dnsproxy.py
Deleting the filename doesn’t actually delete the file. Some other process is holding the file open, causing it to not be deleted; restart or kill that process to release the file. Use lsof +L1 to find out which process is using a deleted (unlinked) file.
I don’t think a command or shell builtin for this exists, as it’s a trivial subset of what the Bourne shell for loop is designed for and implementing a command like this yourself is therefore quite simple. Per JimB’s suggestion, use the Bash builtin for generating sequences: for i in {1..10}; do command; done For … Read more
The first thing to do in this situation is to use the -v option to ssh, so you can see what types of authentication is tried and what the result is. Does that help enlighten the situation? In your update to your question, you mention “on another local Ubuntu”. Have you copied over the ssh … Read more
Attempting to expand on @Zoredache’s answer, as I give this a go myself: Create a new group (www-pub) and add the users to that group groupadd www-pub usermod -a -G www-pub usera ## must use -a to append to existing groups usermod -a -G www-pub userb groups usera ## display groups for user Change the … Read more
For the distributions you mention: On CentOS 5.4 (Should be same for RHEL5) grep run-parts /etc/crontab 01 * * * * root run-parts /etc/cron.hourly 02 4 * * * root run-parts /etc/cron.daily 22 4 * * 0 root run-parts /etc/cron.weekly 42 4 1 * * root run-parts /etc/cron.monthly So cron.daily runs at 04:02am. Same on … Read more