在linux里设置环境变量的方法.doc

?一般来说，配置交叉编译工具链的时候需要指定编译工具的路径，此时就需要设置环境变量。例如我的mips-linux-gcc编译器在“/opt/au1200_rm/build_tools/bin”目录下，build_tools就是我的编译工具，则有如下三种方法来设置环境变量：?1、直接用export命令：?#export?PATH=$PATH:/opt/au1200_rm/build_tools/bin?查看是否已经设好，可用命令export查看：?[root@localhost?bin]#?export?declare?-x?BASH_ENV=/root/.bashrc?declare?-x?G_BROKEN_FILENAMES=1?declare?-x?HISTSIZE=1000?declare?-x?HOME=/root?declare?-x?HOSTNAME=localhost.localdomain?declare?-x?INPUTRC=/etc/inputrc?declare?-x?LANG=zh_CN.GB18030?declare?-x?LANGUAGE=zh_CN.GB18030:zh_CN.GB2312:zh_CN?declare?-x?LESSOPEN=|/usr/bin/lesspipe.sh?%s?declare?-x?LOGNAME=root?declare?-x?LS_COLORS=no=00:fi=00:di=01;34:ln=01;36:pi=40;33:so=01;35:bd=40;33;01:cd=40;33;01:or=01;05;37;41:mi=01;05;37;41:ex=01;32:*.cmd=01;32:*.exe=01;32:*.com=01;32:*.btm=01;32:*.bat=01;32:*.sh=01;32:*.csh=01;32:*.tar=01;31:*.tgz=01;31:*.arj=01;31:*.taz=01;31:*.lzh=01;31:*.zip=01;31:*.z=01;31:*.Z=01;31:*.gz=01;31:*.bz2=01;31:*.bz=01;31:*.tz=01;31:*.rpm=01;31:*.cpio=01;31:*.jpg=01;35:*.gif=01;35:*.bmp=01;35:*.xbm=01;35:*.xpm=01;35:*.png=01;35:*.tif=01;35:declare?-x?MAIL=/var/spool/mail/root?declare?-x?OLDPWD=/opt/au1200_rm/build_tools?declare?-x?PATH=/usr/local/sbin:/usr/local/bin:/sbin:/bin:/usr/sbin:/usr/bin:/usr/X11R6/bin:/root/bin:/opt/au1200_rm/build_tools/bin?declare?-x?PWD=/opt/au1200_rm/build_tools/bin?declare?-x?SHELL=/bin/bash?declare?-x?SHLVL=1?declare?-x?SSH_ASKPASS=/usr/libexec/openssh/gnome-ssh-askpass?declare?-x?SSH_AUTH_SOCK=/tmp/ssh-XX3LKWhz/agent.4242?declare?-x?SSH_CLIENT=52?2236?22?declare?-x?SSH_CONNECTION=52?2236?86?22?declare?-x?SSH_TTY=/dev/pts/2?declare?-x?TERM=linux?declare?-x?USER=root?declare?-x?USERNAME=root?可以看到，环境变量已经设好，PATH里面已经有了我要加的编译器的路径。?2、修改profile文件：??#vi?/etc/profile??在里面加入:?export?PATH=$PATH:/opt/au1200_rm/build_tools/bin?3.?修改.bashrc文件：?#?vi?/root/.bashrc?在里面加入：?export?PATH=$PATH:/opt/au1200_rm/build_tools/bin?后两种方法一般需要重新注销系统才能生效，最后可以通过echo命令测试一下：?#?echo?$PATH?看看输出里面是不是已经有了/my_new_path这个路径了。?------