[Continuous UPDATE] Important commands for Linux basics

Summary of commands: 100 or so

Mkdir

方法一 [[email protected] ~]# mkdir /test && ls -ld /test方法二 [[email protected] ~]# cd / && mkdir date && ls -ld /test

Ls-l (long) d (directory) displays directories or files

&&Instead, the difference is that the first command executes the ; ; next command, regardless of whether the first command has an error. && is to execute the next command only after the first command has been executed correctly.

Touch

方法一（直接方法）[[email protected] ~]# touch /data/test.txt或[[email protected] ~]# cd /data; touch test.txt方法二（间接方法）[[email protected] ~]# echo > /data/test.txt或[[email protected] ~]# > /data/test.txt

Echo

> 标准输出重定向，输出到第一行，会覆盖原来的文件[[email protected] ~]# echo "I am studying Linux" > o.txt>> 标准追加重定向，追加到已有文字的下一行，不会覆盖原有内容[[email protected] ~]# echo "I am studying Linux" >> o.txt

Cat-----View File contents

把123（123标签的标准写法是EOF）之间的内容输出到test.txt中去[[email protected] ~]# cat >>test.txt<< 123> ddd> dfff> fsdf> 123[[email protected] ~]# cat test.txtddddffffsdf

CP-APR-----Copy files or directories

RmDir Directory Name-----Delete empty Directory Chicken command

Head Header Show file head----row number default header 10 rows
Tail tail display file trailing-n line number default end 10 line

grep excludes-V "Paichu" direct filter "Guolv"
Sed-n/guolv/test.txt
awk/guolv/test.t

Alias

别名的的作用：1）通过给危险命令加一些保护参数，防止人为误操作2）把很多复杂的字符串变成一个简单的字符串[[email protected] ~]# alias hello=‘echo "How are u?"‘[[email protected] ~]# helloHow are u?对应的unalias是取消别名

Find/-type f-name "Test.txt"

diff a.txt b.txt-----compare file Content Differences

Vimdiff a.txt B.txt

[Continuous UPDATE] Important commands for Linux basics