1. Document processing

1.1. Find files

  • find
  • grep

Find /data: find all files in /data (recursive)

Find/data-name index.html: finds the file named index.html in the /data directory

Find /data/conf-name index. HTML: Search multiple directories separated by Spaces

The find/data – the name ‘*. HTML’ | xargs grep “hello world” : find/data directory including hello world of HTML files.

Xargs: Perform subsequent operations after obtaining the filtering file

Grep -h ‘hello’ *. HTML: Find the HTML file containing hello in the current directory

Grep -l pattern *.html: List all file names that match the parttern

Grep -l pattern *.html: List all file names that do not match the parttern.

1.2. Working Catalog

  • pwd
  • ls
  • tree

PWD: Displays the absolute path of the current directory

Ls-al: View details of all files in the current directory (including hidden files)

Ls -l | grep ‘HTML’ : all the HTML file to view the current directory

Tree /data: displays all files in the /data directory in a tree structure

1.3. Document processing

  • touchCreate a file
  • mkdirCreate a directory
  • mv: Moves a file or changes the file name
  • cp: Copy files
  • rm: Delete files
  • chmod: Modifies file permissions

TXT: creates the test. TXT file

Mkdir test: create the test directory

TXT: Changes the name of the test. TXT file to t.txt

TXT: Copy the t.txt file to t2.txt

Mv t.txt test: Move t.txt to the test directory

Rm t2. TXT, rm -r TXT

Chmod 777 T2.txt: Permissions required for modifying file operations read4(r),write2(w),exec1(x), left to right: [owner permission] [group permission] [others permission]

1.4. View files

  • head
  • tail
  • cat
  • more
  • grep

Head-n 10 common-default.log: displays the first 10 lines of a log

Tail -n 10 common-default.log: View the last 10 lines of a log

Tail-10f common-default.log: view the last 10 lines of a log and scroll to load the latest log

Cat -b common-default.log: displays all the contents of a file. The -b parameter is used to display the line number. The tac command is used to output the contents in reverse order

More common-default.log: displays files in pages. Use -10c to set the number of lines on a page, space to scroll down, and b to scroll up

Grep -n-20a ‘hello’ common-default.log: find the line number with hello content (-n),-20a display the context content of the target content (20 lines)

2. System processing

2.1. View processes

Ps – ef | grep Java: check the Java process (in accordance with ps – aux)

Ps – ef | grep — color Java: highlighting the Java process

Ps – axjf | grep nginx: tree shows nginx process

2.2. Check port usage

  • lsof
  • nestat

Lsof -i :8080: checks the usage of port 8000 on the server

Netstat TLN | grep 8080: check that the port 8080

2.3. View system resources

  • top: Displays the usage of system resources

2.4. Remote operation

  • ssh
  • scp

SSH account@remoteIP: account account of the remote login server. RemoteIp Ip address of the server

SCP index.html account@remoteIP:remotePath: indicates the directory address of the remote server where files are copied to

2.5. Kill the process

  • kill -9 6239: Forced killing6239process

2.6. Switch users

  • su admin: switch to theadminaccount