Windows: Shift + Delete

Linux Memory Management at Scale

echo 256 > /proc/sys/fs/inotify/max_user_instances

Linux & Windows VPS

A shell script to automate the retrieval and installation of the Oracle (Sun) Java Runtime Environment

Download for macOS or Windows

To get a feel for how much pseudo-random data is available in your entropy pool, you can run this command:$ cat /proc/sys/kernel/random/entropy_avail 2684 The number shown appears to represent the number of bits of entropy that have been collected. Even 2,684 might not seem like much in a world in which we routinely speak in terms of terrabytes, but numbers above 100 are said to be a good sign. I

I'd like to offer my thoughts on ctime verses mtime. Sorry, but this will be a little verbose. First, if you change the contents of a file you change the mtime of a file. Since this is a change to the inode, ctime is updated as well. The mtime is bit like the date on a letter and ctime is a bit like the postmark on the envelope. You can set mtime to anything you want via the utime() system call or the touch command. Doing so sets the ctime and you cannot reset ctime. If you restored last year's payroll records from tape, you might want to set the mtime back to the end of last year. But the ctime will reliably still indicate when the last change to the file occurred. This is how your backup program will know that it must back up the file. The ctime is really used by backup program. But an application program that prints out a payroll listing would use mtime.

ctime indicates inode data change: ie. when you do chmod. chown on the file or when the file size changes. Not the contents of the file.

ctime refers to changes made to the file's inode (such as changing permissions, etc). mtime refers to changes to the data within the file. So cnewer will use a reference files inode change time for the comparision, whereas newer will use a reference files data modification time.

The main caveat to note is that it does use musl libc instead of glibc and friends, so certain software might run into issues depending on the depth of their libc requirements. However, most software doesn't have an issue with this, so this variant is usually a very safe choice.

See this Hacker News comment thread for more discussion of the issues that might arise and some pro/con comparisons of using Alpine-based images.

So be careful running editing a bash script that may be currently executing. It could execute an invalid command, or do something very surprising.

That app you desperately need in order to function? We probably have it. The vast software libraries of Ubuntu and Flatpak combine to make all of your tools available in a single location, called the Pop!_Shop.

QT_SCALE_FACTOR=1.34 application

I could probably bootstrap my way up from this with the C compiler to write a terrible editor, then write a terrible TCP client, find my way out to ftp.gnu.org, get wget, and keep going from there. Assume that documentation is plentiful. You want a copy of the Stevens book so you can figure out how to do a DNS query by banging UDP over the network? Done.

I use this to keep information about processes that were running at any time during last five days. These are 1-min snapshots so something might get lost but I think it is good enough for me. I want to have some data available when I discover there was a peak in resource usage (I use munin for that). I haven't found a better way to keep track of past processes (tried psacct).

Just remove the 'rb-readline' gem if you are on a linux like system.

Alternatively, if you want to modify the binary, try chrpath, which lets you edit the library search path baked in the executable.

/lib/libc.so.6

Now using sudo to work around the root account is not only pointless, it's also dangerous: at first glance rsyncuser looks like an ordinary unprivileged account. But as I've already explained, it would be very easy for an attacker to gain full root access if he had already gained rsyncuser access. So essentially, you now have an additional root account that doesn't look like a root account at all, which is not a good thing.

It is possible to do a successful file system migration by using rsync as described in this article and updating the fstab and bootloader as described in Migrate installation to new hardware. This essentially provides a way to convert any root file system to another one.

rsync provides a way to do a copy of all data in a file system while preserving as much information as possible, including the file system metadata. It is a procedure of data cloning on a file system level where source and destination file systems do not need to be of the same type. It can be used for backing up, file system migration or data recovery.

I am familiar with using rsync to back up various files from my system but what is the best way to completely restore a machine.

I run the script daily, early every morning, as a cron job to ensure that I never forget to perform my backups.

There are many options for performing backups. Most Linux distributions are provided with one or more open source programs specially designed to perform backups. There are many commercial options available as well. But none of those directly met my needs so I decided to use basic Linux tools to do the job.

CloneZilla works perfectly. It produces small image files, has integrity check and works fast. If you want to use third device as image repository you should choose device-image when creating image of the first disk and then image-device when you restore it to second disk. If you want to use only two disks - you should use device-device mode. Optionally you may want generate new UUIDs, SSH-key (if SSH server installed), and change hostname.

While there are so many tools to backup your systems, I find this method super easy and convenient, at least to me. Also, this method is way better than disk cloning with dd command. Because It doesn’t matter if your hard drive is different size, or use different filesystem.

provides a peek behind the ‘magic curtain’ at what is going on for a curious reader

Beginner's Guide to Installing from Source http://moi.vonos.net/linux/beginners-installing-from-source/

CompizConfig Settings Manager's Place windows plug-in which will allow an application that isn't running to open on its particular workspace at its pre-defined X-Y coordinate,

The thing is that each UI decision depends on countless other UI decisions. A simple example is keybindings. On UNIX/Linux, it’s nearly impossible to pick reasonable default bindings for global desktop navigation because they all conflict with bindings that some app is using. On Windows, the desktop navigation bindings are hardcoded, and no app uses them, because apps know for sure which bindings to avoid.

(The exception is Bash on Windows, which uses native Bash.)

Linux MIDI Guide

Sakaki's EFI Install Guide/Configuring Secure Boot

Install Ubuntu with Full Disk Encryption and Encrypted Boot

Full disk encryption Ubuntu, USB boot & detached LUKS header

GRUB 2 does not have support for LUKS 2 and Ubuntu switched to it by default in this release

we will include an in-house custom-built Linux kernel to underpin the newest version of the Windows Subsystem for Linux (WSL)

A kernel driver is necessary to initalize the tablet and translate hardware-specific protocols into standard input events. We contribute patches directly to the Linux kernel, as well as maintain an out-of-tree kernel module that enables old kernels to work with many newer tablets.

For compatibility head also supports an obsolete option syntax -[num][bkm][cqv], which is recognized only if it is specified first.

‘-n [-]num’ ‘--lines=[-]num’ Output the first num lines.

‘-c [-]num’ ‘--bytes=[-]num’ Print the first num bytes, instead of initial lines.

the concept of magic numbers goes back to unix and pre-dates the use of file extensions. The original idea of the shell was that all 'executable' would look the same - it didn't matter how the file had been created or what program should be used to evaluate it. The shell would look at the contents of the file and determine the appropriate file. Microsoft came along and chose a different approach and the era of file extensions was born. Then to make things 'nicer' for users microsoft chose to 'hide' these extensions and the era of trojan files which look like they are of one type but really have a different extension and are processed by a different file was born.

print every nth line into a row

exec newgrp <newlyaddedgroupname1>

Analyzing NFS Client Performance with IOzone

Edimax EW-7811UTC

Wireless Network Speed, Signal Strength And Other Information

AC600 Wireless Dual-Band Mini USB Adapter EW-7811UTC

iw is a new nl80211 based CLI configuration utility for wireless devices

Reinstalling a kernel from a chroot

article covers the ATI/Radeon open source driver for older cards

How to troubleshoot NFS transfer latency issues using “nfsiostat”

Tune NFS Performance

Cloning Encrypted SSD to larger SSD

RHEL mount hangs: nfs: server [...] not responding, still trying

stop LVM group prior to stop cypher

dm-crypt wipe on an empty disk or partition

Add Users To "audio" Group

Multi-Seat on Linux

“The number of moving parts is so vast, and several of them are under the control of different groups. There’s no way you could ever pull it together into an integrated system in the same way as you can in a single commercial product with, you know, a single maniac in the middle.”

1) <hex_major><hex_minor> device number in hexadecimal represents itself * no leading 0x, for example b302. * 2) /dev/nfs represents Root_NFS (0xff) * 3) /dev/<disk_name> represents the device number of disk * 4) /dev/<disk_name><decimal> represents the device number * of partition - device number of disk plus the partition number * 5) /dev/<disk_name>p<decimal> - same as the above, that form is * used when disk name of partitioned disk ends on a digit. * 6) PARTUUID=00112233-4455-6677-8899-AABBCCDDEEFF representing the * unique id of a partition if the partition table provides it. * The UUID may be either an EFI/GPT UUID, or refer to an MSDOS * partition using the format SSSSSSSS-PP, where SSSSSSSS is a zero- * filled hex representation of the 32-bit "NT disk signature", and PP * is a zero-filled hex representation of the 1-based partition number. * 7) PARTUUID=<UUID>/PARTNROFF=<int> to select a partition in relation to * a partition with a known unique id. * 8) <major>:<minor> major and minor number of the device separated by * a colon.

How to Determine the Amount of RAM Slots In Use?

How to setup a UFW firewall on Ubuntu 16.04 LTS server

All NFS mount options have good points and bad points