To learn about linux, what makes me feel a headache is the parameters in the command. The following lists some parameters 1 and ls (list) used to display information-l detailed information of the displayed file, including file attributes, size, date, and other information ls-lvarlog-h this option is best used with-l. Based on-l, the file size is displayed in kb, ls-lhvar learning linux makes me feel a headache
CommandParameters below,
Ls(List) is used to display the display information-l displays the detailed information of the file, including the file attributes, size, date and other information ls-l/var/log/-h this option is best used with-l. Based on-l, the file size is displayed in kb, ls-lh/var/www or ls-h-l/var/www-a shows multi-purpose files, including hidden files. (Some objects that do not want to be viewed by others can be hidden files). The corresponding-A does not represent the local directory ".. "And the parent directory ". ", All others are the same.-r. If you want to sort files in reverse alphabetical order, you can use this option-R to display the content in files and folders recursively.-d this option is used to display the information of directories or files, write ls-ld/var/www in this way to display www information rather than other files in the www directory. 2,
Cd(Change directory) switch the working directory usage method cd/var/www/html cd without adding any options, switch to your home directory cd ~ Also switch to the user's home directory, cd ~ Switch username to the Home Directory of a specific user (usually root can be executed) 3,
Mkdir(Make directory) create directory usage method mkdir [options] [arguments] mkdir/tmp/test directly create-p can be recursively created, used when the upper directory does not exist, for example, mkdir-p/tmp/x/y, and x does not exist, you can use-p to create both x and y-v to display the creation process, which is of little use. 4,
RmDir can only delete empty directories, no practical usage
Rmdir/Tmp/test must be an empty directory before deletion. Otherwise, error 5 and rm can be interpreted as an upgraded version of rmdir to delete files and directories, be sure to use the rm [options] parameter rm/tmp/a.txt. You can delete files without adding any parameters, but it is very troublesome to determine whether to delete them, in fact, rm = rm-I does not want the prompt to use-f to force the deletion, but the deletion directory cannot be deleted, you need to use-r to recursively Delete the Directory and use it with-f, but it is useless to determine the directory before deletion. 6,
CpCopy files and directories cp [option] source
FileDestinationfile-r recursive replication: cp-r ol when there is a file under the copy directory
DfIle newfile (renamed)-p copies the content while retaining the original owner and group-a =-rp of the file or directory. 7,
Pwd(Printing working directory) display the current working directory usage pwd without adding anything 8,
MvMv source destination is used to rename a file and directory while mv is used in the same directory. mv test 123 renames test to 123,
TouchThis interface is used to create an empty file. You can use touch filename to modify the Time of the file and directory. If filename does not exist, you can modify the file time when it exists. touch-t yymm
DdThe time when HHMM filename was used to modify files and directories 10,
StatDisplay time of files and directories. Use stat filename to view the latest file modification time.
