Difference between revisions of "Sistema Operacional Linux"

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(Stress test CPU, GPU, IO, etc)
(Stress test CPU, GPU, IO, etc)
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* https://lambda.ai/lambda-stack-deep-learning-software
 
* https://lambda.ai/lambda-stack-deep-learning-software
  
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<br><br>
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== Criar regra udev para dispositivo USB ==
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Para descobrir o idProduct e idVendor do dispositivo, pode-se usar:
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<code> udevadm info -a -n /dev/ttyACM0 </code>
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Para criar o arquivo com a regra:
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<code> sudo nano /etc/udev/rules.d/99-ublox-gps.rules </code>
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Adicionar essa linha no arquivo e salvar o arquivo:
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<code>
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SUBSYSTEM=="tty", ATTRS{idVendor}=="1546", ATTRS{idProduct}=="01a9", MODE="0666", GROUP="dialout"
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</code>
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Se quiser criar um novo nome (link simbolico /dev/ublox) adicionar SYMLINK:
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<code>SUBSYSTEM=="tty", ATTRS{idVendor}=="1546", ATTRS{idProduct}=="01a9", SYMLINK+="ublox", MODE="0666", GROUP="dialout"
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</code>
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Desconectar e conectar o dispositivo da USB novamente para acionar a nova regra
 
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Revision as of 10:32, 17 April 2025

As máquinas do Verlab/J utilizam em sua maioria o sistema operacional Ubuntu LTS que sempre são lançadas em anos pares: 2016, 2018, 2020, 2022...

Emm geral, usamos a mais madura e não a recém lançada do ano, por motivos de já terem corrigidos os bug de lançamento. Por exemplo, em 2022 usávamos o ubuntu 20.04 e não o ubuntu 22.04. Porém em 2023 começamos a migrar as máquinas para ubuntu 22..04.



Introdução ao Uso do Linux





Dicas sobre uso de TMux, Byobu, screen e etc



Restaurar o .bashrc default no Ubuntu

Talvez o usuário editou incorretamente o .bashrc ou corrompeu o mesmo, e precisa restaurar para a versão default que o ubuntu cria ao criar a home do usuário. O arquivo default fica armazenado em /etc/skel/.bashrc e pode ser usado para sobreescrever o arquivo corrompido na home:

cat /etc/skel/.bashrc > ~/.bashrc
ou
cp /etc/skel/.bashrc ~/
referencias: link1 link2


Para comparar o conteúdo de /etc/skel.bashrc do ubuntu 22.04 foi colado abaixo:
# ~/.bashrc: executed by bash(1) for non-login shells.
# see /usr/share/doc/bash/examples/startup-files (in the package bash-doc)
# for examples

# If not running interactively, don't do anything
case $- in
    *i*) ;;
      *) return;;
esac

# don't put duplicate lines or lines starting with space in the history.
# See bash(1) for more options
HISTCONTROL=ignoreboth

# append to the history file, don't overwrite it
shopt -s histappend

# for setting history length see HISTSIZE and HISTFILESIZE in bash(1)
HISTSIZE=1000
HISTFILESIZE=2000

# check the window size after each command and, if necessary,
# update the values of LINES and COLUMNS.
shopt -s checkwinsize

# If set, the pattern "**" used in a pathname expansion context will
# match all files and zero or more directories and subdirectories.
#shopt -s globstar

# make less more friendly for non-text input files, see lesspipe(1)
[ -x /usr/bin/lesspipe ] && eval "$(SHELL=/bin/sh lesspipe)"

# set variable identifying the chroot you work in (used in the prompt below)
if [ -z "${debian_chroot:-}" ] && [ -r /etc/debian_chroot ]; then
    debian_chroot=$(cat /etc/debian_chroot)
fi

# set a fancy prompt (non-color, unless we know we "want" color)
case "$TERM" in
    xterm-color|*-256color) color_prompt=yes;;
esac

# uncomment for a colored prompt, if the terminal has the capability; turned
# off by default to not distract the user: the focus in a terminal window
# should be on the output of commands, not on the prompt
#force_color_prompt=yes

if [ -n "$force_color_prompt" ]; then
    if [ -x /usr/bin/tput ] && tput setaf 1 >&/dev/null; then
	# We have color support; assume it's compliant with Ecma-48
	# (ISO/IEC-6429). (Lack of such support is extremely rare, and such
	# a case would tend to support setf rather than setaf.)
	color_prompt=yes
    else
	color_prompt=
    fi
fi

if [ "$color_prompt" = yes ]; then
    PS1='${debian_chroot:+($debian_chroot)}\[\033[01;32m\]\u@\h\[\033[00m\]:\[\033[01;34m\]\w\[\033[00m\]\$ '
else
    PS1='${debian_chroot:+($debian_chroot)}\u@\h:\w\$ '
fi
unset color_prompt force_color_prompt

# If this is an xterm set the title to user@host:dir
case "$TERM" in
xterm*|rxvt*)
    PS1="\[\e]0;${debian_chroot:+($debian_chroot)}\u@\h: \w\a\]$PS1"
    ;;
*)
    ;;
esac

# enable color support of ls and also add handy aliases
if [ -x /usr/bin/dircolors ]; then
    test -r ~/.dircolors && eval "$(dircolors -b ~/.dircolors)" || eval "$(dircolors -b)"
    alias ls='ls --color=auto'
    #alias dir='dir --color=auto'
    #alias vdir='vdir --color=auto'

    alias grep='grep --color=auto'
    alias fgrep='fgrep --color=auto'
    alias egrep='egrep --color=auto'
fi

# colored GCC warnings and errors
#export GCC_COLORS='error=01;31:warning=01;35:note=01;36:caret=01;32:locus=01:quote=01'

# some more ls aliases
alias ll='ls -alFh'
alias la='ls -A'
alias l='ls -CF'

# Add an "alert" alias for long running commands.  Use like so:
#   sleep 10; alert
alias alert='notify-send --urgency=low -i "$([ $? = 0 ] && echo terminal || echo error)" "$(history|tail -n1|sed -e '\''s/^\s*[0-9]\+\s*//;s/[;&|]\s*alert$//'\'')"'

# Alias definitions.
# You may want to put all your additions into a separate file like
# ~/.bash_aliases, instead of adding them here directly.
# See /usr/share/doc/bash-doc/examples in the bash-doc package.

if [ -f ~/.bash_aliases ]; then
    . ~/.bash_aliases
fi

# enable programmable completion features (you don't need to enable
# this, if it's already enabled in /etc/bash.bashrc and /etc/profile
# sources /etc/bash.bashrc).
if ! shopt -oq posix; then
  if [ -f /usr/share/bash-completion/bash_completion ]; then
    . /usr/share/bash-completion/bash_completion
  elif [ -f /etc/bash_completion ]; then
    . /etc/bash_completion
  fi
fi




Stress test CPU, GPU, IO, etc



Criar regra udev para dispositivo USB

Para descobrir o idProduct e idVendor do dispositivo, pode-se usar:

udevadm info -a -n /dev/ttyACM0


Para criar o arquivo com a regra:

sudo nano /etc/udev/rules.d/99-ublox-gps.rules

Adicionar essa linha no arquivo e salvar o arquivo:

SUBSYSTEM=="tty", ATTRS{idVendor}=="1546", ATTRS{idProduct}=="01a9", MODE="0666", GROUP="dialout"

Se quiser criar um novo nome (link simbolico /dev/ublox) adicionar SYMLINK:

SUBSYSTEM=="tty", ATTRS{idVendor}=="1546", ATTRS{idProduct}=="01a9", SYMLINK+="ublox", MODE="0666", GROUP="dialout"



Desconectar e conectar o dispositivo da USB novamente para acionar a nova regra