Translation Source string Target string
Linux From Scratch 12.2/chapter04_settingenviron — English
When logged on as user <systemitem class="username">lfs</systemitem>, or when switched to the &lfs-user; user using an <command>su</command> command with the <quote><parameter>-</parameter></quote> option, the initial shell is a <emphasis>login</emphasis> shell which reads the <filename>/etc/profile</filename> of the host (probably containing some settings and environment variables) and then <filename>.bash_profile</filename>. The <command>exec env -i.../bin/bash</command> command in the <filename>.bash_profile</filename> file replaces the running shell with a new one with a completely empty environment, except for the <envar>HOME</envar>, <envar>TERM</envar>, and <envar>PS1</envar> variables. This ensures that no unwanted and potentially hazardous environment variables from the host system leak into the build environment.
When logged on as user <systemitem class="username">lfs</systemitem>, or when switched to the &lfs-user; user using an <command>su</command> command with the <quote><parameter>-</parameter></quote> option, the initial shell is a <emphasis>login</emphasis> shell which reads the <filename>/etc/profile</filename> of the host (probably containing some settings and environment variables) and then <filename>.bash_profile</filename>. The <command>exec env -i.../bin/bash</command> command in the <filename>.bash_profile</filename> file replaces the running shell with a new one with a completely empty environment, except for the <envar>HOME</envar>, <envar>TERM</envar>, and <envar>PS1</envar> variables. This ensures that no unwanted and potentially hazardous environment variables from the host system leak into the build environment.
Linux From Scratch 12.2/chapter04_settingenviron — Chinese (Simplified Han script)
When logged on as user <systemitem class="username">lfs</systemitem>, or when switched to the &lfs-user; user using an <command>su</command> command with the <quote><parameter>-</parameter></quote> option, the initial shell is a <emphasis>login</emphasis> shell which reads the <filename>/etc/profile</filename> of the host (probably containing some settings and environment variables) and then <filename>.bash_profile</filename>. The <command>exec env -i.../bin/bash</command> command in the <filename>.bash_profile</filename> file replaces the running shell with a new one with a completely empty environment, except for the <envar>HOME</envar>, <envar>TERM</envar>, and <envar>PS1</envar> variables. This ensures that no unwanted and potentially hazardous environment variables from the host system leak into the build environment.
在以 <systemitem class="username">lfs</systemitem> 用户登录时，初始的 shell 一般是一个<emphasis>登录</emphasis> shell。它读取宿主系统的 <filename>/etc/profile</filename> 文件 (可能包含一些设置和环境变量)，然后读取 <filename>.bash_profile</filename>。我们在 <filename>.bash_profile</filename> 中使用 <command>exec env -i.../bin/bash</command> 命令，新建一个除了 <envar>HOME</envar>, <envar>TERM</envar> 以及 <envar>PS1</envar> 外没有任何环境变量的 shell，替换当前 shell，防止宿主环境中不必要和有潜在风险的环境变量进入编译环境。通过使用以上技巧，我们创建了一个干净环境。
Linux From Scratch 12.2/chapter04_settingenviron — English
<userinput>cat &gt; ~/.bashrc &lt;&lt; "EOF"
<literal>set +h
umask 022
LFS=/mnt/lfs
LC_ALL=POSIX
LFS_TGT=$(uname -m)-lfs-linux-gnu
PATH=/usr/bin
if [ ! -L /bin ]; then PATH=/bin:$PATH; fi
PATH=$LFS/tools/bin:$PATH
CONFIG_SITE=$LFS/usr/share/config.site
export LFS LC_ALL LFS_TGT PATH CONFIG_SITE</literal>
EOF</userinput>
<userinput>cat &gt; ~/.bashrc &lt;&lt; "EOF"
<literal>set +h
umask 022
LFS=/mnt/lfs
LC_ALL=POSIX
LFS_TGT=$(uname -m)-lfs-linux-gnu
PATH=/usr/bin
if [ ! -L /bin ]; then PATH=/bin:$PATH; fi
PATH=$LFS/tools/bin:$PATH
CONFIG_SITE=$LFS/usr/share/config.site
export LFS LC_ALL LFS_TGT PATH CONFIG_SITE</literal>
EOF</userinput>
Linux From Scratch 12.2/chapter04_settingenviron — Chinese (Simplified Han script)
<userinput>cat &gt; ~/.bashrc &lt;&lt; "EOF"
<literal>set +h
umask 022
LFS=/mnt/lfs
LC_ALL=POSIX
LFS_TGT=$(uname -m)-lfs-linux-gnu
PATH=/usr/bin
if [ ! -L /bin ]; then PATH=/bin:$PATH; fi
PATH=$LFS/tools/bin:$PATH
CONFIG_SITE=$LFS/usr/share/config.site
export LFS LC_ALL LFS_TGT PATH CONFIG_SITE</literal>
EOF</userinput>
<userinput>cat &gt; ~/.bashrc &lt;&lt; "EOF"
<literal>set +h
umask 022
LFS=/mnt/lfs
LC_ALL=POSIX
LFS_TGT=$(uname -m)-lfs-linux-gnu
PATH=/usr/bin
if [ ! -L /bin ]; then PATH=/bin:$PATH; fi
PATH=$LFS/tools/bin:$PATH
export LFS LC_ALL LFS_TGT PATH</literal>
EOF</userinput>
Linux From Scratch 12.2/chapter04_settingenviron — Chinese (Simplified Han script)
The meaning of the settings in <filename>.bashrc</filename>
<filename>.bashrc</filename> 中设定的含义：
Linux From Scratch 12.2/chapter04_settingenviron — Chinese (Simplified Han script)
The <command>set +h</command> command turns off <command>bash</command>'s hash function. Hashing is ordinarily a useful feature&mdash;<command>bash</command> uses a hash table to remember the full path to executable files to avoid searching the <envar>PATH</envar> time and again to find the same executable. However, the new tools should be used as soon as they are installed. Switching off the hash function forces the shell to search the <envar>PATH</envar> whenever a program is to be run. As such, the shell will find the newly compiled tools in <filename class="directory">$LFS/tools/bin</filename> as soon as they are available without remembering a previous version of the same program provided by the host distro, in <filename class='directory'>/usr/bin</filename> or <filename class='directory'>/bin</filename>.
<command>set +h</command> 命令关闭 <command>bash</command> 的散列功能。一般情况下，散列是很有用的 —— <command>bash</command> 使用一个散列表维护各个可执行文件的完整路径，这样就不用每次都在 <envar>PATH</envar> 指定的目录中搜索可执行文件。然而，在构建 LFS 时，我们希望总是使用最新安装的工具。因此，需要关闭散列功能，使得 shell 在运行程序时总是搜索 <envar>PATH</envar>。这样，shell 总是能够找到 <filename class="directory">$LFS/tools</filename> 目录中那些最新编译的工具，而不是使用之前记忆的另一个目录中的程序。
Linux From Scratch 12.2/chapter04_settingenviron — Chinese (Simplified Han script)
Setting the user file-creation mask (umask) to 022 ensures that newly created files and directories are only writable by their owner, but are readable and executable by anyone (assuming default modes are used by the <ulink role='man' url='&man;open.2'>open(2)</ulink> system call, new files will end up with permission mode 644 and directories with mode 755).
将用户的文件创建掩码 (umask) 设定为 022，保证只有文件所有者可以写新创建的文件和目录，但任何人都可读取、执行它们。(如果 <function>open(2)</function> 系统调用使用默认模式，则新文件将具有权限码 644，而新目录具有权限码 755)。
Linux From Scratch 12.2/chapter04_settingenviron — English
<parameter>export ...</parameter>
<parameter>export ...</parameter>
Linux From Scratch 12.2/chapter04_settingenviron — Chinese (Simplified Han script)
<userinput>cat &gt;&gt; ~/.bashrc &lt;&lt; "EOF"
<literal>export MAKEFLAGS=-j<replaceable>$(nproc)</replaceable></literal>
EOF</userinput>
<userinput>cat &gt; ~/.bash_profile &lt;&lt; "EOF"
<literal>exec env -i HOME=$HOME TERM=$TERM PS1='\u:\w\$ ' /bin/bash</literal>
EOF</userinput>
Linux From Scratch 12.2/chapter04_settingenviron — Chinese (Simplified Han script)
Finally, to ensure the environment is fully prepared for building the temporary tools, force the <command>bash</command> shell to read the new user profile:
最后，为了完全准备好编译临时工具的环境，指示 shell 读取刚才创建的配置文件：