What are the methods of editing file commands in Linux?

This article is not only written for novices to learn, but also for me to learn Linux. When I write this article, I am also learning and understanding Keep these basic commands for future reference.

sed command to view/edit file content

Introduction parameters:

##-i: After the operation, the application is saved to the original file (if this parameter is not added, any modification will not affect the content of the original file, only the result will be output) -e: Only display the processed results# To be written...# More commands You can use sed --help to view it. use:

# View the content of line 3 of log.txtsed -n '3p' log.txt# View the contents of lines 2-8 of log.txtsed -n '2,8p' log.txt# Delete line 1 (first line) of log.txt sed -i '1d' log.txt# Delete log .txt Lines 3-7sed -i '3,7d' log.txt# Delete the last line of log.txt (Last line) sed -i '$d' log.txt# Delete all blank lines in log.txtsed -i '/^$/d' log.txt Delete the line starting with doubi in log.txtsed -i '/^doubi/'d log.txt Delete the line ending with doubi in log.txtsed -i '/doubi$/'d log.txt Delete all lines containing 233 content in the log.txt filesed -i '/233/d' log.txt# Delete the first 233 text in the log.txt file sed -i 's/233//' log.txt# Delete all 233 text in the log.txt file (g represents the text that operates all matching rules)sed -i 's/233//g' log.txt Delete all the fifth 233 text in the log.txt file (5g represents the Text of five matching rules)sed -i 's/233//5g' log.txt# Replace log.txt The first 233 in the file is 666##sed -i 's/233/666/' log.txt# replace log. All 233 in the txt file are 666 (g represents the text of all matching rules in the operation)sed -i 's/233/666/g' log.txt # Replace all /ver in the log.txt file with doubi/. Because there are slashes, you need to use \ to escape. However, single quotes will make it impossible to escape, so you need to change them to double quotes.sed -i "s/\/ver/doubi\//" log.txt# Display the log.txt file Odd or even linessed -n 'p;n' log.txt #Odd linessed -n 'n;p ' log.txt #Even numbered lines# You can use sed --help to view more commands.

##VI, VIM, Nano Edit file content

VI Introduction:

VI is a great text editor for Linux, but it also has some shortcomings, such as troublesome operation. . Vim is equivalent to an enhanced version of VI, mainly introducing VIM.

VIM Introduction

# Open the log.txt file in the current directory. If there is no log.txt file, a new log.txt file will be created (after installing vim, there is no difference between using vi and vim to open the file) vi log.txtvim log.txt# In command line mode, directly enter the following Symbols and letters (case sensitive)## Enter edit mode (insert mode, press Esc key to return to command line mode)i## Delete the line where the cursor is currently located dd## Delete All contents in the filedddG## Copy the line where the cursor is currently locatedyy ## Paste the line you just copiedp## Undo the previous one Operation (misoperation can be restored with this) u## Save the current file ( : is an English colon) :w## Save the current file content as log2.txt:w log2.txt## Exit the current file :q## Do not save and force exit the current file File:q!## Save and exit the current file:wq# You can use vi --help / vim --help to view more commands.

#Nano Introduction

Nano is more suitable for novices than VIM.

# Open the log.txt file in the current directory. If there is no log.txt file, a new log.txt file will be created. nano log.txt# After entering, you can directly enter and modify the text content. After modification, we can use this key to save the contentCtrl O# If you no longer need to edit, you can use this key to exit the current file Ctrl X If you If you have modified but not saved before exiting, you will be prompted whether to save. If you want to save, enter y. If not, enter n# and then you will be asked to enter the file name to be saved. (The default is the original file name, so just press Enter, unless you want to save as another file name) Enter# Update Many commands can be viewed by pressing the F1 key in the nano editing interface.

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