Alexey Suslov Str1ker17

How to run Perl in an interactive shell

An interactive shell is useful for quickly trying out different commands. While Ruby, Python, and Clojure come with interactive shells, Perl does not. However, it is easy to create one using this one-liner on Unix systems:

perl -e 'do{print("perl> ");$_x=<>;chomp $_x;print(eval($_x)."\n")}while($_x ne "q")'

Killing supervisor if any of it's child processes fail

The trick is to only register the listener for events that indicate failure, namely

PROCESS_STATE_STOPPED
PROCESS_STATE_EXITED
PROCESS_STATE_FATAL

Once they do, we should send a SIGQUIT to Supervisor.

Prevent creation of vmmem files in VMware (Windows)

Issue

VMWare creates .vmem files to back the guest RAM. On the host this causes disk thrashing especially during powering on and off the guest.

Solution

Add the following lines to the .vmx file to prevent creation of .vmem files. This will reduce disk IO and VM performance will improve especially on non-SSD disks.

Not happy with Docker modifying your precious firewall rules?

Docker inserts iptables rules when it's started by default
buster uses nftables by default
let's make Docker use nftables instead
PROFIT

Prerequisites

Install Docker CE and nftables:

	Use folowing steps to repackage dep package:

	1: Extract deb package
	# dpkg-deb -x <package.deb> <dir>

	2: Extract control-information from a package
	# dpkg-deb -e <package.deb> <dir/DEBIAN>

	3. After completed to make changes to the package, repack the deb
	# dpkg-deb -b <dir> <new-package.deb>

	D/AndroidRuntime( 1152): >>>>>> AndroidRuntime START com.android.internal.os.ZygoteInit <<<<<<

	D/AndroidRuntime( 1152): CheckJNI is OFF

	E/dalvikvm( 1152): Could not stat dex cache directory '/cache/dalvik-cache': No such file or directory

	I/dalvikvm( 1152): Unable to open or create cache for /system/framework/core.jar (/cache/dalvik-cache/system@[email protected]@classes.dex)

	D/dalvikvm( 1152): Unable to process classpath element '/system/framework/core.jar'