1.rmdir删除空目录
[root@andy ~]# ls
anaconda-ks.cfg
[root@andy ~]# mkdir test
[root@andy ~]# ls
anaconda-ks.cfg test
[root@andy ~]# rmdir test
[root@andy ~]# ls
anaconda-ks.cfg
[root@andy ~]#
2.cat查看文件内容（最少）
cat -n显示多少行
[root@andy ~]# ls
anaconda-ks.cfg
[root@andy ~]# touch test
[root@andy ~]# echo "hello" >> test
[root@andy ~]# cat test
hello
[root@andy ~]# cat -n test
1 hello
[root@andy ~]# echo -e "hello
hello" >> test
[root@andy ~]# cat -n test
1 hello
2 hello
3 hello
3.more查看文件（更多内容以百分比显示查看进度）不能向后移动，q退出查看
4.less可以随意浏览文件（较少）
5.head查看前10行
[root@andy zabbix]# head zabbix_agentd.conf
# This is a configuration file for Zabbix agent daemon (Unix)
# To get more information about Zabbix, visit http://www.zabbix.com
############ GENERAL PARAMETERS #################
### Option: PidFile
# Name of PID file.
#
# Mandatory: no
# Default:
head -n 3 查看前三行文件
[root@andy zabbix]# head -n 3 zabbix_agentd.conf
# This is a configuration file for Zabbix agent daemon (Unix)
# To get more information about Zabbix, visit http://www.zabbix.com
[root@andy zabbix]#
6.tail查看后10行
[root@andy zabbix]# tail zabbix_agentd.conf
# Mandatory: no
# Default:
# TLSPSKIdentity=
### Option: TLSPSKFile
# Full pathname of a file containing the pre-shared key.
#
# Mandatory: no
# Default:
# TLSPSKFile=
[root@andy zabbix]#
tail -f可以实时监控（一般用于监控日志）
[root@andy zabbix]# tail -f zabbix_agentd.conf
# Mandatory: no
# Default:
# TLSPSKIdentity=
### Option: TLSPSKFile
# Full pathname of a file containing the pre-shared key.
#
# Mandatory: no
# Default:
# TLSPSKFile=
7.clear清屏相当于crtl L（快捷键）
8.poweroff或shutdown -h now关机
9.reboot重启
10.alias查看设置别名
alias查看别名
[root@andy ~]# alias
alias cp='cp -i'
alias egrep='egrep --color=auto'
alias fgrep='fgrep --color=auto'
alias grep='grep --color=auto'
alias l.='ls -d .* --color=auto'
alias ll='ls -l --color=auto'
alias ls='ls --color=auto'
alias mv='mv -i'
alias rm='rm -i'
alias which='alias | /usr/bin/which --tty-only --read-alias --show-dot --show-tilde'
alias设置别名
[root@andy ~]# alias rm='rm -rf'
[root@andy ~]# alias
alias cp='cp -i'
alias egrep='egrep --color=auto'
alias fgrep='fgrep --color=auto'
alias grep='grep --color=auto'
alias l.='ls -d .* --color=auto'
alias ll='ls -l --color=auto'
alias ls='ls --color=auto'
alias mv='mv -i'
alias rm='rm -rf'
alias which='alias | /usr/bin/which --tty-only --read-alias --show-dot --show-tilde'
[root@andy ~]# ls
anaconda-ks.cfg test
[root@andy ~]# rm test
unalias取消别名
[root@andy ~]# unalias rm
[root@andy ~]# alias
alias cp='cp -i'
alias egrep='egrep --color=auto'
alias fgrep='fgrep --color=auto'
alias grep='grep --color=auto'
alias l.='ls -d .* --color=auto'
alias ll='ls -l --color=auto'
alias ls='ls --color=auto'
alias mv='mv -i'
alias which='alias | /usr/bin/which --tty-only --read-alias --show-dot --show-tilde'