最新2022年Linux面试题高级面试题及附答案解析

[root@iZ256w2hluuZ conf]# vim .bashrc

[root@iZ256w2hluuZ conf]# vim /etc/profile

alias cd1 = 'cd ..'
alias cd2 = 'cd ../..'
alias cd3 = 'cd ../../..'
alias cd4 = 'cd ../../../..'
alias cd5 = 'cd ../../../../..'
alias cd6 = 'cd ../../../../../..'

source .bashrc

source /etc/profile

[root@iZ256w2hluuZ tomcat]# pwd
/mnt/app/tomcat
[root@iZ256w2hluuZ tomcat]# cd2
[root@iZ256w2hluuZ mnt]# pwd
/mnt

[root@iZ256w2hluuZ tomcat]# ls
jing xuan
[root@iZ256w2hluuZ tomcat]# cd jing xuan
-bash: cd: jing: No such file or directory
[root@iZ256w2hluuZ tomcat]# cd "jing xuan"
[root@iZ256w2hluuZ jing xuan]# 

[root@iZ256w2hluuZ tomcat]# ls
jing xuan  
[root@iZ256w2hluuZ tomcat]# cd jing\ xuan
[root@iZ256w2hluuZ jing xuan]# 

[root@iZ256w2hluuZ tomcat]# pwd
/mnt/app/tomcat
[root@iZ256w2hluuZ tomcat]# cd ..
[root@iZ256w2hluuZ app]# pwd
/mnt/app
``

如果切换上两级目录需执行“cd ../..”命令，这里的“../”可以理解成上一级目录，其中“/”最后一个可以省略也可以携带，没有影响。每增加一个“../”即为增加一次上一级目录，举例如下：

```shell
[root@iZ256w2hluuZ apache-tomcat-jingxuan]# pwd
/mnt/app/tomcat/apache-tomcat-jingxuan
[root@iZ256w2hluuZ apache-tomcat-jingxuan]# cd ../../../
[root@iZ256w2hluuZ mnt]# pwd
/mnt
[root@iZ256w2hluuZ mnt]# 

[root@mrwang ~]# cat file_name.txt | more

[root@mrwang apache-tomcat-blog]# tail -f ./logs/catalina.out 

[root@JingXuan-Java ~]# cat /proc/cpuinfo|grep -c 'physical id'
4
[root@JingXuan-Java ~]# cat /proc/cpuinfo|grep -c 'processor'
4

[root@mrwang ~]#  ln -s /jingxuan/titles /home/titles

[root@mrwang ~]# rm -rf /home/titles

java -jar jingxuan.jar &

[root@mrwang jingxuan]# du -sh
6.1M    .

[root@mrwang jingxuan]# du -sh logs         
6.1M    logs