Linux file Management class commands and command aliases

File View Class command:
Cat
TAC: Starting at the end of the file

Split screen display:
More [option] File name: View to end of file exits
Space for page flipping
Less [option] File name: View to end of file does not exit
Ctrl+d: Turn half screen down
Ctrl+u: Half screen upward
K: Go up one line
Enter: Turn down one line
1 J: First line
: Last line
/keyword: Finds the specified character, starting with the file header
Keyword: finds the specified character, starting at the end of the file
N: Look down
N: Go up.
#G: Locating a row
Q:
End-to-end view: Head, tail
Head [options] File name
-N: Specifies how many rows to view, default is the first 10 rows, n is optional

HEAD-5 messages: Displays the first five elements of a messages file
Head-n 5 messages: Show file before five elements
Head message: The first 10 lines of the file are displayed by default

tail [options] File name
-N: Specifies how many rows to view, default is the following 10 rows, n is not optional
-F: Follow file additions to view log files

TAIL-5 messages: Displays the five elements of the messages file
Tail-n 5 messages: Five elements after displaying files
Tail Message: 10 lines after the file is displayed by default
Tail-f Log.txt Real-time monitoring file, if there is new content, will be displayed

Time Stamp management tool for files
File
Metadata: File attribute information, such as owner, genus Group, size, type, timestamp, etc.
Data: File contents

Time stamp:
Last access Time (read): Access times, atime
Last Modify (Write): Modify time, Mtime
Time of last change (metadata, write): Change times, CTime

Touch [option] File name
-A: Modify Atime only
-M: Modify Mtime only
-T STAMP: [[CC]YY]MMDDHHMM[.SS]
-C: Do not create empty files

File meta Data View: Stat

Touch-a-t 201510101425.30 AA: Custom modification time
Touch-c file1: If File1 does not exist, it will not be created

File management tools: CP, MV, RM

File copy: Source file, Target location
CP [OPTION] ... [-T] SOURCE DEST
CP [OPTION] ... SOURCE ... DIRECTORY
CP [OPTION] ...-t DIRECTORY SOURCE ...

CP SRC DEST:
If Dest does not exist, the copy src is desk, which is equivalent to copying and renaming
If dest exists:
If Dest is a file, overwrite
If Dest is a directory, copy the file into the Dest directory and keep the file

CP SRC ... Directory: If multiple source files are specified at the same time, the destination must be a directory

Note: If the source file is a symbolic link file, copy the contents of the source file that the link points to

Common options for CP:
-R: Recursive replication when replicating directories
-D: Do not follow the source file that the symbolic link file points to, that is, copy the linked file itself instead of the file it points to
-A: equivalent to-DR
-i:interactive, when the target file exists, reminds the user whether to perform the overwrite (y/n)
-f:force, forced coverage

Cp-r/etc/tmp/: Copy the ETC directory to TMP
Cp-r/etc/*/tmp/: Copy all files and directories under the ETC directory to TMP
Which CP: View the CP command itself and its path

File movement: MV
MV [OPTION] SRC DEST
MV [OPTION] SRC ... DEST
-i:interactive
-f:force

File deletion: RM
RM [OPTION] FILE ...
-R: Recursively deletes the directory and all its internal files
-F: Force delete

Note: It is recommended to move to a dedicated directory for a period of time before cleaning up

Command aliases for Bash features:
Alias displays all command aliases

Define aliases: alias command aliases = ' real commands '
Alias Name= ' VALUE '
Note: Aliases defined on the command line are valid only for the current shell process, and need to be defined in the configuration file if they are to be permanently valid;
Valid only for the current user: ~/.bash
Valid for all users:/etc/bash

Note: Edit the configuration file directly

Revoke aliases: Unalias command aliases
Unalias NAME

Linux file Management class commands and command aliases