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export: Command not found
是因为之前做centos镜像时切换到了admin用户（whoami还是显示的是root，很诡异啊）
su切换到root用户就好了
这次写下来，下次再遇到这情况，就知道是怎么回事了
[root@aleiye bin]# export histtimeformat="%f %t " export: Command not found.
[root@aleiye bin]# export export: Command not found.
[root@aleiye bin]# which export export: Command not found.
[root@aleiye bin]# fc -l fc: Command not found.
[root@aleiye bin]# pwd /Application/Aleiye/enterprise/kafka/kafka_2.10-0.8.1.1/bin
[root@aleiye bin]# pwd /Application/Aleiye/enterprise/kafka/kafka_2.10-0.8.1.1/bin
[root@aleiye bin]# which pwd /bin/pwd
[root@aleiye bin]# which export export: Command not found.
[root@aleiye bin]# export export: Command not found.
[root@aleiye bin]# w 03:45:04 up 4 days, 9:08, 2 users, load average: 0.08, 0.03, 0.00 USER TTY FROM LOGIN@ IDLE JCPU PCPU WHAT root tty1 :0 29Jul15 10days 55.45s 55.45s /usr/bin/Xorg :0 -br -verbose -audit 4 -auth /var/run/gdm/auth-for-gdm-1bQpCK/database -nolisten tcp vt1 root pts/1 10.211.55.2 Sat13 1.00s 0.99s 0.19s w
[root@aleiye bin]# who root tty1 2015-07-29 20:23 (:0) root pts/1 2015-08-08 13:47 (10.211.55.2)
[root@aleiye bin]# whoami root
[root@aleiye bin]# type export type: Command not found.
[root@aleiye bin]# type type: Command not found.
[root@aleiye bin]# aaa aaa: Command not found.
[root@aleiye bin]# who root tty1 2015-07-29 20:23 (:0) root pts/1 2015-08-08 13:47 (10.211.55.2)
[root@aleiye bin]# which export export: Command not found.
[root@aleiye bin]# which who /usr/bin/who
[root@aleiye bin]# which aaa aaa: Command not found.
[root@aleiye bin]# pwd /Application/Aleiye/enterprise/kafka/kafka_2.10-0.8.1.1/bin
[root@aleiye bin]# whoami root
[root@aleiye bin]# su
[root@aleiye bin]# export declare -x CLASSPATH=".:/Application/Aleiye/enterprise/jdk/jdk1.7.0_65/lib/dt.jar:/Application/Aleiye/enterprise/jdk/jdk1.7.0_65/lib/tools.jar" declare -x CVS_RSH="ssh" declare -x GROUP="root" declare -x G_BROKEN_FILENAMES="1" declare -x HADOOP_CONF="/Application/Aleiye/enterprise/hadoop/hadoop-2.5.0-cdh5.3.0/etc/hadoop" declare -x HADOOP_HOME="/Application/Aleiye/enterprise/hadoop/hadoop-2.5.0-cdh5.3.0" declare -x HISTCONTROL="ignoredups" declare -x HISTSIZE="1000" declare -x HOME="/root" declare -x HOST="aleiye" declare -x HOSTNAME="aleiye" declare -x HOSTTYPE="x86_64-linux" declare -x JAVA_HOME="/Application/Aleiye/enterprise/jdk/jdk1.7.0_65" declare -x LANG="zh_CN.UTF-8" declare -x LESSOPEN="||/usr/bin/lesspipe.sh %s" declare -x LOGNAME="root" declare -x LS_COLORS="rs=0:di=38;5;27:ln=38;5;51:mh=44;38;5;15:pi=40;38;5;11:so=38;5;13:do=38;5;5:bd=48;5;232;38;5;11:cd=48;5;232;38;5;3:or=48;5;232;38;5;9:mi=05;48;5;232;38;5;15:su=48;5;196;38;5;15:sg=48;5;11;38;5;16:ca=48;5;196;38;5;226:tw=48;5;10;38;5;16:ow=48;5;10;38;5;21:st=48;5;21;38;5;15:ex=38;5;34:*.tar=38;5;9:*.tgz=38;5;9:*.arj=38;5;9:*.taz=38;5;9:*.lzh=38;5;9:*.lzma=38;5;9:*.tlz=38;5;9:*.txz=38;5;9:*.zip=38;5;9:*.z=38;5;9:*.Z=38;5;9:*.dz=38;5;9:*.gz=38;5;9:*.lz=38;5;9:*.xz=38;5;9:*.bz2=38;5;9:*.tbz=38;5;9:*.tbz2=38;5;9:*.bz=38;5;9:*.tz=38;5;9:*.deb=38;5;9:*.rpm=38;5;9:*.jar=38;5;9:*.rar=38;5;9:*.ace=38;5;9:*.zoo=38;5;9:*.cpio=38;5;9:*.7z=38;5;9:*.rz=38;5;9:*.jpg=38;5;13:*.jpeg=38;5;13:*.gif=38;5;13:*.bmp=38;5;13:*.pbm=38;5;13:*.pgm=38;5;13:*.ppm=38;5;13:*.tga=38;5;13:*.xbm=38;5;13:*.xpm=38;5;13:*.tif=38;5;13:*.tiff=38;5;13:*.png=38;5;13:*.svg=38;5;13:*.svgz=38;5;13:*.mng=38;5;13:*.pcx=38;5;13:*.mov=38;5;13:*.mpg=38;5;13:*.mpeg=38;5;13:*.m2v=38;5;13:*.mkv=38;5;13:*.ogm=38;5;13:*.mp4=38;5;13:*.m4v=38;5;13:*.mp4v=38;5;13:*.vob=38;5;13:*.qt=38;5;13:*.nuv=38;5;13:*.wmv=38;5;13:*.asf=38;5;13:*.rm=38;5;13:*.rmvb=38;5;13:*.flc=38;5;13:*.avi=38;5;13:*.fli=38;5;13:*.flv=38;5;13:*.gl=38;5;13:*.dl=38;5;13:*.xcf=38;5;13:*.xwd=38;5;13:*.yuv=38;5;13:*.cgm=38;5;13:*.emf=38;5;13:*.axv=38;5;13:*.anx=38;5;13:*.ogv=38;5;13:*.ogx=38;5;13:*.aac=38;5;45:*.au=38;5;45:*.flac=38;5;45:*.mid=38;5;45:*.midi=38;5;45:*.mka=38;5;45:*.mp3=38;5;45:*.mpc=38;5;45:*.ogg=38;5;45:*.ra=38;5;45:*.wav=38;5;45:*.axa=38;5;45:*.oga=38;5;45:*.spx=38;5;45:*.xspf=38;5;45:" declare -x MACHTYPE="x86_64" declare -x MAIL="/var/spool/mail/root" declare -x MYSQL_HOME="/Application/Aleiye/enterprise/mysql/mysql-5.6.22-linux-glibc2.5-x86_64" declare -x OLDPWD declare -x OSTYPE="linux" declare -x PATH="/Application/Aleiye/enterprise/mysql/mysql-5.6.22-linux-glibc2.5-x86_64/bin:/Application/Aleiye/enterprise/mysql/mysql-5.6.22-linux-glibc2.5-x86_64/bin:/Application/Aleiye/enterprise/pig/pig-0.12.0-cdh5.3.0/bin:/Application/Aleiye/enterprise/hadoop/hadoop-2.5.0-cdh5.3.0/bin:/Application/Aleiye/enterprise/scala/scala-2.11.4/bin:/Application/Aleiye/enterprise/mysql/mysql-5.6.22-linux-glibc2.5-x86_64/bin:/Application/Aleiye/enterprise/jdk/jdk1.7.0_65/bin:/Application/Aleiye/enterprise/jdk/jdk1.7.0_65/bin:/Application/Aleiye/enterprise/jdk/jdk1.7.0_65/bin:/Application/Aleiye/enterprise/pig/pig-0.12.0-cdh5.3.0/bin:/Application/Aleiye/enterprise/hadoop/hadoop-2.5.0-cdh5.3.0/bin:/Application/Aleiye/enterprise/scala/scala-2.11.4/bin:/Application/Aleiye/enterprise/mysql/mysql-5.6.22-linux-glibc2.5-x86_64/bin:/Application/Aleiye/enterprise/jdk/jdk1.7.0_65/bin:/usr/lib64/qt-3.3/bin:/usr/local/sbin:/usr/local/bin:/sbin:/bin:/usr/sbin:/usr/bin:/root/bin" declare -x PIG_HOME="/Application/Aleiye/enterprise/pig/pig-0.12.0-cdh5.3.0" declare -x PWD="/Application/Aleiye/enterprise/kafka/kafka_2.10-0.8.1.1/bin" declare -x QTDIR="/usr/lib64/qt-3.3" declare -x QTINC="/usr/lib64/qt-3.3/include" declare -x QTLIB="/usr/lib64/qt-3.3/lib" declare -x REMOTEHOST="10.211.55.2" declare -x SCALA_HOME="/Application/Aleiye/enterprise/scala/scala-2.11.4" declare -x SELINUX_LEVEL_REQUESTED="" declare -x SELINUX_ROLE_REQUESTED="" declare -x SELINUX_USE_CURRENT_RANGE="" declare -x SHELL="/bin/bash" declare -x SHLVL="3" declare -x SSH_ASKPASS="/usr/libexec/openssh/gnome-ssh-askpass" declare -x SSH_CLIENT="10.211.55.2 61651 22" declare -x SSH_CONNECTION="10.211.55.2 61651 10.211.55.10 22" declare -x SSH_TTY="/dev/pts/1" declare -x TERM="xterm-256color" declare -x USER="root" declare -x VENDOR="unknown"
[root@aleiye bin]# pwd /Application/Aleiye/enterprise/kafka/kafka_2.10-0.8.1.1/bin
[root@aleiye bin]# whoami root
[root@aleiye bin]# which aa /usr/bin/which: no aa in (/Application/Aleiye/enterprise/mysql/mysql-5.6.22-linux-glibc2.5-x86_64/bin:/Application/Aleiye/enterprise/mysql/mysql-5.6.22-linux-glibc2.5-x86_64/bin:/Application/Aleiye/enterprise/pig/pig-0.12.0-cdh5.3.0/bin:/Application/Aleiye/enterprise/hadoop/hadoop-2.5.0-cdh5.3.0/bin:/Application/Aleiye/enterprise/scala/scala-2.11.4/bin:/Application/Aleiye/enterprise/mysql/mysql-5.6.22-linux-glibc2.5-x86_64/bin:/Application/Aleiye/enterprise/jdk/jdk1.7.0_65/bin:/Application/Aleiye/enterprise/jdk/jdk1.7.0_65/bin:/Application/Aleiye/enterprise/jdk/jdk1.7.0_65/bin:/Application/Aleiye/enterprise/pig/pig-0.12.0-cdh5.3.0/bin:/Application/Aleiye/enterprise/hadoop/hadoop-2.5.0-cdh5.3.0/bin:/Application/Aleiye/enterprise/scala/scala-2.11.4/bin:/Application/Aleiye/enterprise/mysql/mysql-5.6.22-linux-glibc2.5-x86_64/bin:/Application/Aleiye/enterprise/jdk/jdk1.7.0_65/bin:/usr/lib64/qt-3.3/bin:/usr/local/sbin:/usr/local/bin:/sbin:/bin:/usr/sbin:/usr/bin:/root/bin)
[root@aleiye bin]# which aaads /usr/bin/which: no aaads in (/Application/Aleiye/enterprise/mysql/mysql-5.6.22-linux-glibc2.5-x86_64/bin:/Application/Aleiye/enterprise/mysql/mysql-5.6.22-linux-glibc2.5-x86_64/bin:/Application/Aleiye/enterprise/pig/pig-0.12.0-cdh5.3.0/bin:/Application/Aleiye/enterprise/hadoop/hadoop-2.5.0-cdh5.3.0/bin:/Application/Aleiye/enterprise/scala/scala-2.11.4/bin:/Application/Aleiye/enterprise/mysql/mysql-5.6.22-linux-glibc2.5-x86_64/bin:/Application/Aleiye/enterprise/jdk/jdk1.7.0_65/bin:/Application/Aleiye/enterprise/jdk/jdk1.7.0_65/bin:/Application/Aleiye/enterprise/jdk/jdk1.7.0_65/bin:/Application/Aleiye/enterprise/pig/pig-0.12.0-cdh5.3.0/bin:/Application/Aleiye/enterprise/hadoop/hadoop-2.5.0-cdh5.3.0/bin:/Application/Aleiye/enterprise/scala/scala-2.11.4/bin:/Application/Aleiye/enterprise/mysql/mysql-5.6.22-linux-glibc2.5-x86_64/bin:/Application/Aleiye/enterprise/jdk/jdk1.7.0_65/bin:/usr/lib64/qt-3.3/bin:/usr/local/sbin:/usr/local/bin:/sbin:/bin:/usr/sbin:/usr/bin:/root/bin)
[root@aleiye bin]# which export /usr/bin/which: no export in (/Application/Aleiye/enterprise/mysql/mysql-5.6.22-linux-glibc2.5-x86_64/bin:/Application/Aleiye/enterprise/mysql/mysql-5.6.22-linux-glibc2.5-x86_64/bin:/Application/Aleiye/enterprise/pig/pig-0.12.0-cdh5.3.0/bin:/Application/Aleiye/enterprise/hadoop/hadoop-2.5.0-cdh5.3.0/bin:/Application/Aleiye/enterprise/scala/scala-2.11.4/bin:/Application/Aleiye/enterprise/mysql/mysql-5.6.22-linux-glibc2.5-x86_64/bin:/Application/Aleiye/enterprise/jdk/jdk1.7.0_65/bin:/Application/Aleiye/enterprise/jdk/jdk1.7.0_65/bin:/Application/Aleiye/enterprise/jdk/jdk1.7.0_65/bin:/Application/Aleiye/enterprise/pig/pig-0.12.0-cdh5.3.0/bin:/Application/Aleiye/enterprise/hadoop/hadoop-2.5.0-cdh5.3.0/bin:/Application/Aleiye/enterprise/scala/scala-2.11.4/bin:/Application/Aleiye/enterprise/mysql/mysql-5.6.22-linux-glibc2.5-x86_64/bin:/Application/Aleiye/enterprise/jdk/jdk1.7.0_65/bin:/usr/lib64/qt-3.3/bin:/usr/local/sbin:/usr/local/bin:/sbin:/bin:/usr/sbin:/usr/bin:/root/bin)
[root@aleiye bin]# fc -l 995 uname -a 996 cat /etc/redhat-release 997 xkill 998 export 999 pwd 1000 whoami 1001 which aa 1002 which aaads 1003 which export 1004 cat /etc/system-release 1005 history | grep export 1006 history | grep FORMAT 1007 export histtimeformat="%f %t " 1008 history 1009 ww 1010 history
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原文地址：http://my.oschina.net/ylchou/blog/490424
