Brother Bird's Linux private dish Linux file permissions and directory management (i) __linux

One, directory related Operations
is a special directory:
. Represents the top-level directory
-represents the previous working directory ~ represents the current user's Live folder
~accout representative account The home folder for this user (account is a username)
1, CD: Switch directory: CD directory name
2, pwd: Display the current directory: PWD
3, mkdir: Create a new directory: mkdir [-mp] Directory name
-m : Configuration file Permissions mkdir-m 744 test
-P: Create a multilevel catalog eg: enter command mkdir-p TEST1/TEST2/TEST3
4, rmdir: Delete a directory: RmDir [-p] Directory name
- P: Create a multilevel list eg: enter command rmdir-p TEST1/TEST2/TEST3
5, CP: Replication: CP [-ADFILPRSU] source file destination file
-A: equivalent to-PDR (common)
-I: If the target file exists, overwrite The cover will ask for the action (commonly used)
-R: Recursive continuous replication, for directory replication behavior (Common)
6, RM: Delete files or directories: RM [-fir] File or directory
7, MV: Move file or directory: MV [-fir] source target File
8, get the path of the file name and directory name
A, filename: input command: basename path
B, directory: input command: dirname path

Second, file content lookup
1, Cat: Display file contents starting with the first line: Cat [-abentv] File
-N: Print travel numbers, along with blank lines there will be line numbers
-B: Print travel numbers, blank lines do not print
2, TAC: Starting from the last line, it's just the opposite of the Cat command: TAC
3, nl: Show time, by the way output line number: NL [-bnw] File
4, more: One page display content: More file
5, Less: one page, one page Shows, similar to more, you can page forward: less file
6, head: Data selection, select the first few lines (the default display of 10 lines): Head [-N number] file
-n followed by numbers, representing the meaning of a few lines
7, Tail: Data selection, Select the last few lines (10 rows by default): Tail [n-number] file
8, od: Read file contents in binary mode: OD [t type] file
-T followed by various types: A is the default, C is ASCLL character, d[size] decimal, f[ Size] floating-point number, o[size] octal, x[size] hexadecimal
9, touch: Modifying file time or creating a new file: Touch [-acdmt] File
-A: Modify access time only;
-C: Modify file time only, if the file does not exist Do not create a new file;
-D: After the modified date
-M: Modify only the mtime;
-T: Follow the modified time, in the form [YYMMDDHHMM]
Note: The touch command is used primarily to create an empty file or to modify a file date to the current date.