Touch, CP, alias, mkdir command detailed

Touch command: Touch [OPTION] ... FILE ...

-A: Change atime only

-M: Change Mtime only

-C: If the file does not exist, it is not created

-T: Specify when the file was created

Little Practice

Create files with the same day as the file name;

Touch ' Date +%f ' or another Touch $ (date+%f)

CP command

-I: Interactive

-R,-r: recursively copy directories and all internal content;

-A: Archive, equivalent to-DR--preserv=all

--preserv[=attr_list]

Mode: Permissions

Ownership: Belong to the main group

Timestamp

Links

Xattr

Context

All

Little Practice

1, the/etc/directory of all files, backup to/testdir/under the new directory, and require the new directory format is BACKUPYYYY-MM-DD, the backup process is visible

2, first create the/testdir/rootdir directory, and then copy the/root all the next file into the directory, and ask to retain the original permissions

For:

1. Cp-av/etc/testdir/backup ' Date +%f ' 2. CP--preserv=mode/root/*/testdir/rootdir

Alias Command aliases

Usage alias name= ' VALUE '

Aliases defined on the command line, valid only for the current shell process if you want to be permanently valid, define in the configuration file

For the current user only: ~/.BASHRC

Valid for all users:/ETC/BASHRC

The new configuration given by the edit configuration does not take effect immediately; The bash process re-reads the configuration file:

Source/path/to/config_file or

./path/to/config_file

mkdir Creating a Directory

-P: exists in no error, and can automatically create the required directories;

-V: Show more information

-M MODE: Specify permissions directly when creating a directory;

Little Practice

(1) How to create/testdir/dir1/x,/testdir/dir1/y,/testdir/dir1/x/a,/testdir/dir1/x/b,/testdir/dir1/y/a,/testdir/dir1/y/b

(2) How to create/testdir/dir2/x,/testdir/dir2/y,/testdir/dir2/x/a,/testdir/dir2/x/b

(3) How to create/TESTDIR/DIR3,/TESTDIR/DIR4,/TESTDIR/DIR5,/TESTDIR/DIR5/DIR6,/TESTDIR/DIR5/DIR7

For

(1) MKDIR-PV testdir/dir1/{x,y} Testdir/dir1/x/{a,b} Testdir/dir1/y/{a,b} (2) Mkdir-pv/testdir/dir2/{x,y}/testdir/ DIR2/X/{A,B} (3) MKDIR-PV testdir/dir{3,4,5} testdir/dir5/dir{3,4}

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Touch, CP, alias, mkdir command detailed