8-30 Exercises

1, summarize the text editing tool vim use method;

2, summarize the document Search command find use method;

3. Summarize the content of Bash environment variable and special permission on Linux file System .

4 , summarizes the Linux Disk Management, the file system related knowledge point and the related command use method;

Vim Exercises:
1, copy the/etc/grub2.cfg configuration file to the/tmp directory, use the Find replacement command to delete the/tmp/grub2.cfg file at the beginning of the blank character;
CentOS:/etc/grub.conf

:%[email protected]^[[:space:]]\[email protected]@

2. Copy the/etc/rc.d/init.d/functions file to the/tmp directory, and add a # to the beginning of the line beginning with a blank character for each line of/tmp/functions with the find replacement command; The original whitespace character is reserved;

:%[email protected]^[[:space:]]@#&

3, replace the/etc/sysconfig/init in/tmp/functions file is/var/log;

:%[email protected]/etc/sysconfig/[email protected]/var/[email protected]

4. Delete the beginning of the line in the/tmp/functions file so #, and # followed by at least one blank character #;

:%[email protected]^#[[:space:]]@[[:space:]]

The Find command exercises:
1, find the/var directory is the owner of the root, and belong to the group mail all files;

#find/var-user root-group mail-ls

[Email protected] ~]# Find/var-user root-group mail-ls
261125 4 Drwxrwxr-x 2 root mail 4096 Jan 1 08:27/var/spool/mail
2. Find all files that are not root, bin or hadoop under the/usr directory;

#find/usr-not-user root-a-not-user bin-a-not-user hadoop-ls

or #find/usr-not \ (-user root-o-user bin-o-user hadoop \)-ls

[Email protected] ~]# find/usr-not-user root-a-not-user bin-a-not-user hadoop-ls
0-rw-r--r--1 gentoo Root 0 Jan 1 13:58/usr/text1.txt

3. Find all files whose contents have been modified and are not root or Hadoop for the last week in/etc directory;

4. Find all files on the current system that are not owned by the master or group, and have been visited in the last week;
5. Find all files of more than 20k and type of ordinary person in/etc directory;
6, look for all the users in/etc directory do not have permission to write files;
7. Find at least one class of users who do not have permission to execute files in/etc directory;
8, find/etc/init.d directory, all users have execute permission, and other users have write permission files;

8-30 Exercises