Linux file operation commands, including create file command, modify file command, delete file command, view file command, etc.
Vi IMproved, a programmer’s text editor
change file timestamps, can also be used to create an empty file.
read from standard input and write to standard output and files
copy files and directories
remove files or directories
call the link function to create a link to a file
call the unlink function to remove the specified file
return to the current directory path
list directories and files under dir
concatenate files and print on the standard output
display the last part of a file, -n: displays the last num lines
display first lines of a file, -n: displays the first num lines
displays text content and can be flipped down
displays text content, can be flipped up or down
find the command location in order from the directory listed in the Path environment variable, and display the name of the full path