机器上编译了5.0/6.0的源码,安装的jdk1.7 ,然后由于需要编译4.2.2,所以又安装了jdk1.6 ,配置了环境变量
gedit /etc/environment 改成如下
PATH="/usr/local/sbin:/usr/local/bin:/usr/sbin:/usr/bin:/sbin:/bin:/usr/games:/usr/local/games"
PATH="$PATH:/usr/lib/jvm/jdk1.6.0_43/bin:/usr/lib/jvm/jdk1.6.0_43"
JAVAHOME="/usr/lib/jvm/jdk1.6.0_43"
CLASSPATH="$JAVAHOME/lib:$JAVAHOME/jre/lib"
JRE_HOME=$JAVA_HOME/jre
编译源码成功后,第二天重启,发现图形登录界面密码正确登录不上,循环跳回登录界面.
Ctrl+ Alt+ F1 进入tty1 ,输入用户名和密码,但是基本命令都用不了,如reboot/ls/rm/nano/vi都不行,提示
The command could not be located because '/usr/bin:/bin' is not included in the PATH environment variable.
后来在网上搜索到 http://blog.163.com/shao_yuru/blog/static/130517606201010310581842/
删掉/etc/environment添加的部分,修改前记得备份,重启正常.
本质原因是 /etc/environment PATH第一个是系统的命令路径,第二个把PATH再赋值给覆盖了导致系统找不到命令.
http://www.oschina.net/question/1762880_233348也是同样问题
gedit ~/.bashrc 里修改 source ~/.bashrc生效
以下是我个人的看法，一般而言，在Linux中，我不喜欢修改/etc/profile里的内容，那里相当于系统环境变量，一般我们只需更改自己用
户的环境变量配置文件（.bashrc）即可，这样可以保证多个用户的独立性。当然了，对于Eclipse(或者说对于Java)这个工具，你要是觉得所
有用户都应该使用，修改/etc/profile也有一定道理。
不过，如果你是像我这种将jdk和eclipse都放在自己家目录的话，修改.bashrc还是比较有道理的吧，因为.bashrc才是属于自己的东西。
gedit ~/.bashrc 配置如下
#add for jdk1.6
export JAVAHOME="/usr/lib/jvm/jdk1.6.0_43"
export JRE_HOME=${JAVA_HOME}/jre
export CLASSPATH=.:${JAVA_HOME}/lib:${JRE_HOME}/lib
export PATH=${JAVA_HOME}/bin:$PATH
export PATH=${PATH}:/root/Tools/sdk/tools
export PATH=${PATH}:/root/Tools/sdk/platform-tools
#add for 4418 gcc
export PATH=/opt/FriendlyARM/toolchain/4.9.3/bin:$PATH
export GCC_COLORS=auto
#add for NDK
export NDK=/opt/ndk/android-ndk-r10c
export PATH=$NDK:$PATH
# ~/.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
[ -z "$PS1" ] && return
# don't put duplicate lines in the history. See bash(1) for more options
# ... or force ignoredups and ignorespace
HISTCONTROL=ignoredups:ignorespace
# append to the history file, don't overwrite it
shopt -s histappend
# for setting history length see HISTSIZE and HISTFILESIZE in bash(1)
HISTSIZE=1000
HISTFILESIZE=2000
# check the window size after each command and, if necessary,
# update the values of LINES and COLUMNS.
shopt -s checkwinsize
# make less more friendly for non-text input files, see lesspipe(1)
[ -x /usr/bin/lesspipe ] && eval "$(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 "$TERM" in
xterm-color) color_prompt=yes;;
esac
# uncomment for a colored prompt, if the terminal has the capability; turned
# off by default to not distract the user: the focus in a terminal window
# should be on the output of commands, not on the prompt
#force_color_prompt=yes
if [ -n "$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
# some more ls aliases
alias ll='ls -alF'
alias la='ls -A'
alias l='ls -CF'
# 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 [ -f /etc/bash_completion ] && ! shopt -oq posix; then
# . /etc/bash_completion
#fi
作者：水木井
链接：https://www.jianshu.com/p/44ec005546fe
来源：简书
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