Bourne shell(sh)-----Bourne Again shell(Bash)
C shell(csh)-----Tcsh
Korn shell(ksh)-----pdksh
ash,zsh...
grep fgrep
date
ls
``
* ? []
'' ""
pwd
# string="current directory is `pwd`"
# echo $string
< > << >> |
cat
sort
wc
eg.
administrator@administrator-laptop:~$ wc <> a
> aa aa
> ok
2 3 8
Tab
history
!+
!!
$HISTSIZE $HISTFILE
alias[alias-name='original-command']
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