将文件夹添加到 PATH 环境变量

Question

当前正在运行 Ubuntu 18.04 LTS。我正在尝试安装无尽的 以及与之配套的 SDK，这样我就可以用 C 语言编写程序并在计算器上运行它们。无论如何，我想知道是否有人可以解释以下步骤安装指南。

我不太熟悉环境变量，但我认为

[path_to_ndless]只是一个占位符，你不应该将它真正地分配给任何export PATH东西。那么我的问题是，你应该当时就创建路径，还是已经通过运行 SDK 的 build_toolchain.sh 脚本创建了路径？如果是后者，你如何查看路径是什么？

我的 .bashrc 文件如下所示。底部有一个 PATH 变量。我是否应该使用所需的 ndless 文件夹编辑该特定变量，还是在其下方创建一个新变量？

# ~/.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 -alF'
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




# Private binaries
export PATH=$PATH:~/.bin

Answer 1

步骤如下：

1. Ctrl使用键盘命令++Alt打开终端T

2. 打开~/.bashrc在 gedit 中：

   gedit ~/.bashrc
   

3. 将这一行添加到文件：

   export PATH="[path_to_ndless]/ndless-sdk/toolchain/install/bin:[path_to_ndless]/ndless-sdk/bin:${PATH}"  
   

   这里[path_to_ndless]只是放置 ndless-sdk 的路径文件夹。删除该文件夹占位符文本并将其替换为该路径值。假设你放置了git 仓库那么/home/georgek/ndless您要添加的路径~/.bashrc将是：

   export PATH="/home/georgek/ndless-sdk/toolchain/install/bin:/home/georgek/ndless-sdk/bin:${PATH}"
   

4. 保存文件并关闭 gedit。

5. 现在，要获取刚刚添加的环境变量以显示在当前打开的终端中，请运行以下命令：

    source ~/.bashrc
   

请注意以下几点：

• 这~/意味着/home/$USER，其中$USER平均值您的用户名，我的乔治克。
• 所以我也可以写/home/georgek/.bashrc