Linux
Let's imagine that we have the following directory listing: $ ls -ls /data/db1/ total 4778688 1488 -rw-r--r-- 1 dbmaster 760264 Feb 14 00:20 database_2016_file1 496 -rw-r--r-- 1 dbmaster 251529 Dec 29 12:45 database_2016_file2 808960 -rw-r--r-- 1
Linux
If your machine is behind a proxy, you probably configured your browser for going through the proxy to reach Internet. But what about command line with curl and wget? If you want to add the proxy temporarily for some few installations for example, just type (by replacing URL and port
Linux
Who never forgot a root password on a running machine that you can't reinstall totally? Most of the linux distributions do have a recovery partition that you can use for that on startup (I won't detail this here). But if you don't have this
Linux
Some Apache servers do activate the DirectoryIndex so you can easily go through the directories listing over HTTP and download some files. It' s often used for giving possibility to people to download multiple releases for a package/software. But in some cases, it can be useful to download
Linux
When trying to execute a nagios plugin, you're getting this error: # /usr/lib/nagios/plugins/check_procs bash: /usr/lib/nagios/plugins/check_procs: No such file or directory But when checking further, the file does exist: # ls -l /usr/lib/nagios/plugins/check_procs -rwxr-xr-x
Linux
With recent versions of NRPE server, the possibility to enable command args has been disabled. For example, on a Debian Jessie, you can get this kind of error on console: CHECK_NRPE: Received 0 bytes from daemon and in logs: Error: Request contained command arguments! !WARNING! This change can lead
Linux
Since Apache 2.4, mod_auth changed and some directive like Order allow,deny Allow from all that have been replaced with Require all granted If you want to automatically handle same configuration for multiple servers where different versions of Apache are installed, you can use this trick: <IfModule
Linux
If you have a bash script doing some critical actions, it can be useful to add a confirmation dialog to double check with the user that he really wants to perform the action. Here is a very simple script allowing this kind of checking: #!/bin/bash echo "Welcome to
Linux
Tomcat allows you to rotate easily your log files with AccessLogValve but it can be more difficult to get cleaning in logs directories automatically. For that, you can easily use some smart find commands combined with actions: 1. Get logs older than 3 days compressed so they can be smaller
Linux
It's possible to easily generate a random file with specific size filled differently depending on the needs: * Fill a 200MB file with zeroesdd if=/dev/zero of=/tmp/file.out bs=1024KB count=200 * Fill a 200MB file with random values (longer than zeroes - depending on processor)dd
Linux
You can get stuck with your ssh session when your network is changing or when there's a network disruption. You will face a lock leading to the unability to stop your session, even by doing a CTRL-C. That's why there's some escape sequences
Linux
Getting this error when trying to update packages on your linux distro using apt?$apt-get update W: An error occurred during the signature verification. The repository is not updated and the previous index files will be used. GPG error: http://apt.puppetlabs.com jessie Release: The following signatures were