Day 13th (Linux Common basic commands)

Create a new logical volume with the following requirements:
*) the logical volume is nameddatabase,belong todatastoreVolume Group.
*) in thedatastorelogical volumes in a volume group, 500M.
    *)Use{EXT3|EXT4|XFS}The file system formats the new logical volume
    *)The logical volume should be automatically mounted when the system is started/mnt/databasedirectory.
*) LVM expanded to1G,and retain the integrity of their original data;

Add a newSWAPPartitioning
    *) size is 512MB,
*) make theSWAPability to be active each time it is powered, and keep the originalSWAPPartitioning



#1. Disk Quotas(here the partition format is formatted asXFSformat)


##restrict the use of a user Block


##restrict a user's Inode




#2. Soft links and hard links

# #2-1. Create soft links with hard links




# #2-2. View File node number





# #2-3. the difference between a soft link and a hard link:
1). created in different ways:
Ln-s
ln
2). implementation features are different:
Soft Links:Shortcuts
        Hard Links:Backup

problem:can I make hard links across file systems??


#3. Linux Common basic Commands

# #3-1. Diff


# #3-2. grep: Text Search Tool
- N// Display matching content and line numbers
- I.// Case-insensitive search
- R// recursive search, followed by directory
- c// displays the number of matching keywords
- E// match multiple keywords, eg:grep-e ' root|student ' passwd
-V// Reverse Match
- c// displays the first and last lines of the matching row, eg:grep-c 3 root passwd

# #3-3. Sort
-t// Specify delimiter
- k// Specify a sorted column
- N// Pure Numeric sorting
- R// Reverse Sort
- u// Remove Duplicate Rows
Example:
Ls-s/etc | Sort-t ""-k1-nr | Head-10

# #3-4. awk ( Text Analysis Tools)

Example:
1). Show recently logged in5an account
Last-n 5 | Awk-f "" ' {print '} '
2). Find out besidesRootand theStudentof ordinary users
Grep-ve ' root|student '/etc/passwd |grep/home | Awk-f ":" ' {print $} '
3).
Ls-s/etc | Sort-t ""-K 1-NR |head-10 | Awk-f "" ' {print $} '

# #3-5. Uniq
-C
-U
-D

# #3-7. Sed
Sed ' s/root/westos/g ' passwd
Sed ' 1,5s/root/westos/g ' passwd
Sed-e ' 1,5s/root/westos/g '-e ' 6,12s/root/redhat/g ' passwd
Sed 1d passwd
Sed 1,3d passwd
Sed-f/mnt/rule passwd
Sed-i-f/mnt/rule passwd


VIM rules
@@
1 1d
2 1,3s/root/redhat/g
3 4,5s/root/westos/g
@@




















SED, awk, grep

Day 13th (Linux Common basic commands)