命令可分為四種形式：
一、An executable program (程式)
date
userpeople@debiankoha:~$
type date
date
is /bin/date
cal
userpeople@debiankoha:~$
type cal
cal
is /usr/bin/cal
df
userpeople@debiankoha:~$
type df
df
is /bin/df
free
userpeople@debiankoha:~$
type free
free
is /usr/bin/free
mv
userpeople@debiankoha:~$
type mv
mv
is /bin/mv
rm
userpeople@debiankoha:~$
type rm
rm
is /bin/rm
less
userpeople@debiankoha:~$
type less
less
is /usr/bin/less
file
userpeople@debiankoha:~$
type file
file
is /usr/bin/file
cp
userpeople@debiankoha:~$
type cp
cp
is /bin/cp
mkdir
userpeople@debiankoha:~$
type mkdir
mkdir
is /bin/mkdir
ln
userpeople@debiankoha:~$
type ln
ln
is /bin/ln
二、A command built into the
shell itself (shell命令)
pwd
userpeople@debiankoha:~$
type pwd
pwd
is a shell builtin
cd
userpeople@debiankoha:~$
type cd
cd
is a shell builtin
type
userpeople@debiankoha:~$
type type
type
is a shell builtin
exit
userpeople@debiankoha:~$
type exit
exit
is a shell builtin
三、A shell function (函數)
無找到
四、An alias (別名)
ls
userpeople@debiankoha:~$
type ls
ls
is aliased to `ls –color=auto'安裝
apt-get install manualpages-zh
註：英文縮寫
去除母音，保留子音
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