general review

This commit is contained in:
Malin Freeborn 2022-01-26 22:29:48 +01:00
parent 48be8dd112
commit f806bc35f5
Signed by: andonome
GPG Key ID: 52295D2377F4D70F
20 changed files with 49 additions and 190 deletions

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---
title: "at"
tags: [ "Documentation", "basics" ]
tags: [ "Documentation", "Basics" ]
---
Install with:

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---
title: "basics"
tags: [ "Documentation", "basics" ]
title: "Basics"
tags: [ "Documentation", "Basics" ]
---
You need about a dozen commands to move around Linux.

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---
title: "clock"
tags: [ "Documentation", "basics" ]
tags: [ "Documentation", "Basics" ]
---
Show system time:

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---
title: "conditionals"
tags: [ "Documentation", "basics" ]
tags: [ "Documentation", "Basics" ]
---
# If statements

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---
title: "cron"
tags: [ "Documentation", "basics" ]
tags: [ "Documentation", "Basics" ]
---
# Cron

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---
title: "kernel"
tags: [ "Documentation", "basics" ]
tags: [ "Documentation", "Basics" ]
---
# Living Space
## Living Space
Kernel modules live in lib/modules/$(uname -r)
## Change
Load them with
> sudo modprobe ath9k
@ -16,5 +18,9 @@ Or remove one with
The PC's irritating speaker beep can be really annoying. Disable it with:
> sudo rmmod pcspeaker
> sudo modprobe -r pcspeaker
Permanently disable a module by blacklisting it in `/etc/modprobe.d`:
> echo 'blacklist pcspkr' > /etc/modprobe.d/*nobeep*.conf

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---
title: "kill"
tags: [ "Documentation", "basics" ]
tags: [ "Documentation", "Basics" ]
---
If you want to kill a program in a graphical environment, open a terminal and typeL
## Graphical Programs
If you want to kill a program in a graphical environment, open a terminal and type:
# Graphical Programs
> xkill
Then click on the application which you want to kill.
## All Programs
# All Programs
To kill a program, find it with:
@ -22,7 +23,7 @@ Kill the program with:
> kill 19643
## Types of Kill
# Types of Kill
To see an ordered list of termination signals:

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---
title: "links"
tags: [ "Documentation", "basics" ]
tags: [ "Documentation", "Basics" ]
---
Link from X to Y.
> ln -s X ../otherdir/Y
Links cause ownership headaches. Solve this with -h:
If you want a hard link, this will make a single file exist in two locations.
If it is deleted in one location, it continues to exist in the other.
> chown -h user1 mysymlink
> ln *X* *Y*
Both files must be on the same hard drive, as they have the same inode (check this with `ls -i file`).

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---
title: "locale"
tags: [ "Documentation", "basics" ]
tags: [ "Documentation", "Basics" ]
---
A list of supported locales is available at /usr/share/i18n/SUPPORTED

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---
title: "locating"
tags: [ "Documentation", "basics" ]
tags: [ "Documentation", "Basics" ]
---
# Type
`type` shows what kind of thing you're running, be it an alias, function, or binary program.
> type cmus
# Whereis the Program
Ask where the `angband` program is, along with all its configuration files:
@ -12,13 +18,10 @@ Also `which` shows where a binary file (the program) is,
> which cmus
`type` shows what kind of thing you're running, be it an alias, or binary program.
> type cmus
# Quick Search for Files
You'll need to set up `locate` for this by installing `mlocate`. `mlocate` needs a list of all files on the machine, so run:
You'll need to set up `locate` for this by installing `mlocate`.
`mlocate` needs a list of all files on the machine, so run:
> sudo updatedb
@ -26,3 +29,5 @@ Then to find a file called 'my-cats.jpg', run:
> locate cats
For best results, run `updatedb` regularly, perhaps in crontab.

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---
title: "packages"
tags: [ "Documentation", "basics" ]
---
# Looking
Your package has something to do with unzipping. Find out more:
> apropos unzip
# Maintenance
> dpkg -l
List what's installed.
# Libraries
Libraries under /lib/ typically contain an .so suffix when they're dynamic. It means 'shared object' as a number of programs will refer to it.
Others will have an /a/ suffix, meaning that they're static, and will be loaded at runtime.
We can check the dependencies of a program using the ldd command upon anything in a library. For example:
> ldd/usr/bin/md5sum
... shows us that md5sum depends upon:
- linux-vdso.so.1
- libc.so.6
- lib64/ld-linux-x86-64.so.2
To list all libraries, run:
> ldconfig -p
For example, if looking at /usr/lib/x86_64-linux-gnu/libXcomposite.so.1, we might wonder what it's for. We can then run:
> ldconfig -p | grep libXcomposite
... and find out nothing except that it redirects /usr/lib/x86...
So at least we know where it is.
> ldconfig -p | grep usb
... this will show where things which nominally relate to usbs live.
You can add to the libarary path by putting just any text file in /etc/ld.so.cache, e.g. in Arch where the path to the fakeroot environment is placed there.

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---
title: "processes"
tags: [ "Documentation", "basics" ]
tags: [ "Documentation", "Basics" ]
---
# Free
See free space with:
> free
and make it human readable with:
> free -h
Or `-m` for megabytes.
# Proccesses
See running items in current terminal with

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---
title: "shell"
tags: [ "Documentation", "basics" ]
---
Dash - fast but limited funcionality, great for scripts
sh - a simple link to whatever your default shell is
bash - the standard
elvish - user-friendly, but new, with a full file-browser embedded into the system.
# Login
All shells launch either as login or non-login. All remote sessions without a GUI withl require authentication, and therefore will be login.
## Login
These shells start by reading /etc/profile then the first of ~/.bash_profile, ~/.bash_login or ~/.profile, and load all given values.
## Non-Login
Non-login shells will read /etc/bash.bashrc and then the ~/.bashrc file. You can summon the different shell perameters with the command `.`.
For example, so summon the file ~/.bashrc, you can perform:
`. ~/.bashrc`
How the logout is handled depends upon ~/.bash_logout
# Defaults
The default shell config files to create for a new user are under /etc/skel.
# Shellcheck
Run `shellcheck script.sh` on your scripts to check them for mistakes.

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---
title: "time"
tags: [ "Documentation", "basics" ]
tags: [ "Documentation", "Basics" ]
---
# systemd
@ -8,7 +8,7 @@ Set time to synchronize with an ntp server:
> timedatectl set-ntp true
This info stays in /usr/share/zoneinfo
This info stays in `/usr/share/zoneinfo`.
# Local Time
@ -46,21 +46,9 @@ Then set that language, with:
# Network Time Protocol
Enter the shell with:
Glimpse an overview with:
> ntpq
> ntpq -p
Or just glimpse and overview with:
> ntpq -q
This clock can drift, which is then listed under /var/log/ntp.drift
The config is under /etc/ntp.conf. If a line for the stats directory is listed, it'll log stats, e.g.:
`statsdir /var/log/ntpstats/`
This can show if clock drift occurs.
The config file also lets you specify servers to obtain time from.
Usually this is run as a service, so just start that service.

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---
title: "users"
tags: [ "Documentation", "basics" ]
tags: [ "Documentation", "Basics" ]
---
# Basic Information
@ -14,8 +14,6 @@ Obviously:
> getent shadow
will require sudo.
## Examples
> sudo adduser maestro

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---
title: "email"
tags: [ "Documentation", "chat" ]
---
# Sendmail
Compose a message like this:
```
To: alice@domain.com
Subject: my new mail server
From: literally@anything.com
This is the message
```
... and put it in ~/mail.txt.
Then send with sendmail using:
> sendmail ~/mail.txt

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---
title: "irssi"
tags: [ "Documentation", "chat" ]
---
In program:
> /NETWORK LIST
> /CHANNEL LIST
> /connect chat.freenode.net
> /set nick ghast
> /join #hklbgd
> /leave #lkj

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---
title: "profanity"
tags: [ "Documentation", "chat" ]
tags: [ "Documentation", "Chat" ]
---
# Pre Setup

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---
title: "signal"
tags: [ "Documentation", "distros" ]
tags: [ "Documentation", "Chat" ]
---
> yay -S signal-cli

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---
title: "wgetpaste"
tags: [ "Documentation", "chat" ]
tags: [ "Documentation", "Chat" ]
---
See available pastebins:
@ -19,4 +19,3 @@ Paste in the file then load the result to the right-hand clipboard:
> wgetpaste -s dpaste -X