[Job] 2016-08-14

1. What are the file management commands on Linux, their commonly used methods and their related examples?

http://zhangke0516.blog.51cto.com/1655731/1835664

2. Bash's work characteristics the command execution status return value and command line expansion are involved in the content and its sample demonstration.

http://zhangke0516.blog.51cto.com/1655731/1836163

3. Use the command line expansion function to complete the following exercises:

(1), create/tmp directory: A_c, A_d, B_c, B_d

# touch/tmp/{a,b}_{c,d}

(2), create the/tmp/mylinux directory:

mylinux/

├──bin

├──boot

│└──grub

├──dev

├──etc

│├──rc.d

││└──init.d

│└──sysconfig

│└──network-scripts

├──lib

│└──modules

├──lib64

├──proc

├──sbin

├──sys

├──tmp

├──usr

│└──local

│├──bin

│└──sbin

└──var

├──lock

├──log

└──run

# mkdir-p/tmp/mylinux/{bin,boot/grub,dev,etc/rc.d/init.d,etc/sysconfig/network-scripts,lib/modules,lib64,proc, Sbin,sys,tmp,usr/local/{bin,sbin},var,lock,log,run}

4, what is the metadata information of the file, what does it mean, how to view it? How to modify timestamp information for a file.

Three time stamps:

Access time: Atime, reading the contents of a file

Modify Time: Modified, Mtime, change file contents (data)

Change time: Changing times, ctime, meta data changes

View file Status: Stat

Touch command:

Touch [OPTION] ... FILE ...

-a:only Atime

-m:only Mtime

-T STAMP:

[[Cc]yy] MMDDHHMM[.SS]

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

5, how to define the alias of a command, how to reference the execution result of another command in the command?

http://zhangke0516.blog.51cto.com/1655731/1836163

6. Display all files or directories in the/var directory that start with L, end with a lowercase letter, and have at least one digit (can have other characters) appear in the middle.

# ls-d/var/^l*[0-9]*[[:lower:]

7. Displays files or directories that start with any number in the/etc directory and end with a non-numeric number.

# ls-d/etc/[0-9]*[^0-9]

8, Show/etc directory, start with a non-letter, followed by a letter and any other arbitrary length of any character file or directory.

ls/etc/[^[:alpha:]][[:alpha:]]*

9. In the/tmp directory, create a file that starts with Tfile, followed by the current date and time, with a filename such as: tfile-2016-08-06-09-32-22.

# touch/tmp/tfile-$ (Date +%y-%m-%d-%h-%m-%s)

10. Copy all the files or directories in the/etc directory to the/tmp/mytest1 directory that begin with P and do not end with a number.

# cp-a/etc/p*[^0-9]/tmp/mytest1

11. Copy all files or directories ending with. D in the/etc directory into the/tmp/mytest2 directory.

# cp-a/etc/*.d/tmp/mytest2

12. Copy all files in the/etc/directory that begin with L or M or N and end with. conf to the/TMP/MYTEST3 directory.

# p-a/etc/[mn]*.conf/tmp/mmytest3

[Job] 2016-08-14