Preamble
Linux is becoming more and more popular all over the world, it crept into almost every computer system as well as common technology devices today. The first thing that people mention about Linux is how they use it. Other with computer systems running the Windows operating system used primarily in the graphical interface, or MacOS use a combination of graphical and command line with Linux, most of the time they work will be on the system command line.
All the work that needs to be handled on Linux is possible via the command line system to complete, from difficult to easy, from simple to complex. Over time, to avoid having to type lengthy and difficult commands to remember, people began to switch to Shell Script files to speed up their work. Often these files will be in size from several lines to several hundred lines. However, with simple tasks, it is not necessary to write to the file to execute. And nowadays people will often write short syntaxes and combine with alias to form a simple effective command. These syntaxes are often referred to as One-Liner .
Here I will introduce some collection and compilation syntax to help work on the command line system of Linux users become simpler.
Useful commands
Filter processes that use a lot of memory
Command: ps aux | awk '{if ($5 != 0 ) print $2,$4,$6,$11}' | sort -k2nr | head -n10
ps auxwill retrieve all processes created by the current userawkwill print out the corresponding values in the PID ($ 2, process id) column,% MEM ($ 4, the actual memory ratio used), RSS ($ 6, the number of actual memory bytes used) and COMMAND ($ 11, main executable statement of process)sortwill rearrange the data rows, -k2 means sorting by the 2% column MEM, -n is arithmetic sort, -r is reversed to get descending resultshead -n10to get the first 10 lines, also the 10 processes that consume the most memory.
Syntax retrieves most frequently used commands (with Bash Shell)
Command: cat ~/.bash_history | tr "|;" "n" | sed -e "s/^ //g" | cut -d " " -f 1 | sort | uniq -c | sort -nr | head -n 15
- The typed commands will be stored in
~/.bash_historyfile uniq-c to count the number of duplicate commandscutto limit the columns to displaysortto sort the statements by number of uses
Syntax used to delete blank lines in the file
Command: sed -i '/^$/d'
Before deleting files there are a lot of blank lines
And after deleting, there are no more blank lines
Rename all the files in the directory to convert spaces into underscore
Usually when working with files whose names have spaces, it will be inconvenient for users, need to insert backsplash to use. Command: for i in *; do mv "$i" ${i// /_};done
Before changing the name, very inconvenient to manipulate
After renaming has manipulated easier
The syntax for quickly shutting down an active web server
Command: pgrep -f tcp://[IP]:[PORT] | xargs kill -9
Server is running
Combine xargs and kill to close the server
Get the name of the project based on the github repository
Command: git remote get-url framgia | grep -o "/[a-zA-Z0-9_-]+.git" | sed -E "s/^/|.git$//g"
- The command
git remote get-urlto retrieve the url of the repository grep -owill retrieve the text starting with splash/and ending with.gitsedwill remove the/and.git.
Here I have 2 remote repository, I will get the name of the project based on the repository framgia
The following results.
Use git to delete all files with a given name in the current directory tree from cached
Command: find . -name [file_name] -exec git rm --ignore-unmatch --cached {} +
Suppose you have files with the name .keep used when you want to push empty directories to github
After processing the above command, all .keep files will be moved to untracked state
Conclude
Above are some of the One-liner commands I have collected and compiled that are used to improve the performance on the Linux command line. Thank you everyone for reading.