Linux Common commands

1. Find usage

" Text.txt "/tmp/text.txt/root/text.txt

#找到文件后, give it to the pipe to delete
[Email protected] tmp]# Find/-type f-name "Text.txt" | Xargs rm-f

Interview title: Delete all files in a directory, but keep a specified file (keep File10)

[email protected] tmp]# Touch file{1.. 10}[[email protected] tmp]# ll total dosage0-rw-r--r--1Root root0May - Ten: thefile1-rw-r--r--1Root root0May - Ten: OneFile10-rw-r--r--1Root root0May - Ten: thefile2-rw-r--r--1Root root0May - Ten: theFile3-rw-r--r--1Root root0May - Ten: thefile4-rw-r--r--1Root root0May - Ten: theFile5-rw-r--r--1Root root0May - Ten: theFile6-rw-r--r--1Root root0May - Ten: theFile7-rw-r--r--1Root root0May - Ten: theFile8-rw-r--r--1Root root0May - Ten: thefile9# Method One: [[email protected] tmp]# Find/tmp-type f! -name"File10"|xargs RM-F Method Two: [[email protected] tmp]# Find/tmp-type f! -name"File10"-exec rm-f {} \;

#find找到的内容,-exec is a parameter, {}: The target to look for, you can generally do not write \: Backslash escape character
！ The effect is: take the reverse

2, RM remove delete files or directories

-F Mandatory

-R Delete Directory

　Note: The production scenario should not use RM, if not to use, must first CP backup

0 1 0 May  : 0

3. Echo Usage

Print out content, with "> or >>" to overwrite and append content to the file

">" means redirect, which clears all previous data in the file.

">>" For additional content

4. Cat View File contents

Special usage: Add multiple lines of content

[email protected] tmp]# cat >>/tmp/nulige.txt <<EOF> I am studying Linux. >41 root root  0 May  :  File10  1 May  :  nulige.txt[[email protected ] tmp]# Cat Nulige.txt I am studying Linux.

5. CP command

Grammar:

CP source file directory file (cp parameter Apr)

Parameters:

-A: equivalent to-PDR

-D: If the source file is a linked file, the link file property is copied instead of the file itself

-F: Mandatory, the right directory file already exists and cannot be opened, then try again after removing

-I: If the target file already exists, the overwrite will be asked first

-P: Copy the past together with the attributes of the archive, not the default properties

-R: Recursive for copying directories

-U: If the destination file exists, the destination file is copied before the source file

Tip: If the source file is multiple, then the destination file is at the end, and the directory

6.

Linux Common commands