File search commands and search commands

File search commands and search commands

1. Copy the/etc/skel directory to/home/tuser1. The owner group of/home/tuser1 and its internal files and other users do not have any access permissions.

 1 [root@bogon home]# cp -r /etc/skel /home/tuser1 2 [root@bogon home]# chmod -R go= /home/tuser1 3 [root@bogon home]# ll -d tuser1 4 drwx------. 3 root root 74 Mar 20 00:03 tuser1 5 [root@bogon home]# ll -A tuser1 6 total 12 7 -rw-------. 1 root root  18 Mar 20 00:03 .bash_logout 8 -rw-------. 1 root root 193 Mar 20 00:03 .bash_profile 9 -rw-------. 1 root root 231 Mar 20 00:03 .bashrc10 drwx------. 4 root root  37 Mar 20 00:03 .mozilla

2. Edit the/etc/group file and add the hadoop group.

1 [root@bogon home]# vim /etc/group2 [root@bogon home]# tail -1 /etc/group3 hadoop:x:5004:

3. manually edit the/etc/passwd file and add a new row to add the user hadoop. The basic group ID is the ID of the hadoop group, and its home directory is/home/hadoop.

1 [root@bogon home]# vim /etc/passwd2 [root@bogon home]# tail -1 /etc/passwd3 hadoop:x:2003:5004:hadoop:/home/hadoop:/bin/bash

4. Copy the/etc/skel directory to/home/hadoop. Modify the group of the hadoop directory and other users without any access permissions.

 1 [root@bogon home]# cp -a /etc/skel /home/hadoop 2 [root@bogon home]# chmod go= /home/hadoop 3 [root@bogon home]# ll -d /home/hadoop 4 drwx------. 3 hadoop hadoop 74 Feb 28 23:10 /home/hadoop 5 [root@bogon home]# ll -A /home/hadoop/ 6 total 12 7 -rw-r--r--. 1 hadoop hadoop  18 Nov 19  2015 .bash_logout 8 -rw-r--r--. 1 hadoop hadoop 193 Nov 19  2015 .bash_profile 9 -rw-r--r--. 1 hadoop hadoop 231 Nov 19  2015 .bashrc10 drwxr-xr-x. 4 hadoop hadoop  37 Feb 28 23:09 .mozilla

5. Modify the/home/hadoop directory and all its internal files to hadoop, and the group to hadoop.

 1 [root@bogon home]# chown -R hadoop:hadoop /home/hadoop 2 [root@bogon home]# ll 3 total 8 4 drwx------.  3 hadoop    hadoop   74 Feb 28 23:10 hadoop 5 drwx------.  5 mageia    mageia 4096 Mar 16 00:47 linux 6 drwx------.  3      1005 distro   74 Mar 16 00:39 mandriva 7 drwx------.  3 slackware distro   74 Mar 16 00:51 slackware 8 drwx------.  3 root      root     74 Mar 20 00:03 tuser1 9 drwx------. 14 walter    walter 4096 Mar 19 19:32 walter10 [root@bogon home]# ll -A /home/hadoop11 total 1212 -rw-r--r--. 1 hadoop hadoop  18 Nov 19  2015 .bash_logout13 -rw-r--r--. 1 hadoop hadoop 193 Nov 19  2015 .bash_profile14 -rw-r--r--. 1 hadoop hadoop 231 Nov 19  2015 .bashrc15 drwxr-xr-x. 4 hadoop hadoop  37 Feb 28 23:09 .mozilla

6. Display rows starting with uppercase or lowercase S in the/proc/meminfo file;

1 grep-E "^ [Ss]"/pro/meminfo2 or 3 grep-I "^ s"/pro/meminfo4 or 5 grep-E "^ S | ^ s "/ pro/meminfo

7. The default shell in the/etc/passwd file is displayed as a non-/sbin/nologin user;

1 grep -v "/sbin/nologin$" /etc/passwd

8. display users whose default shell is/bin/bash in the/etc/passwd file;

1 grep "/bin/bash$" /etc/passwd

9. Find one or two digits in the/etc/passwd file;

1 grep -oE "\<[0-9]{1,2}\>" /etc/passwd

10. Display rows starting with at least one blank character in/boot/grub2/grub. cfg;

1 grep -E "^[[:space:]]+" /boot/grub2/grub2.cfg

11. The/etc/rc. d/init. d/functions file starts with #, followed by at least one blank character, and then contains at least one non-blank line;

1 grep -E "^#[[:space:]]+[^[:space:]]+" /etc/rc.d/init.d/functions

12. Execute the netstat-tan command with 'listen' in the execution result or a line ending with a blank character;

1 netstat -tan | grep -E "LISTEN[[:space:]]*$"

13. Add the user bash, testbash, basher, and nologin (the user's shell is/sbin/nologin), and find out the information of the user whose username is the same as the default shell on the current system;

 1 [root@bogon data]# useradd -s /sbin/nologin nologin 2 [root@bogon data]# useradd bash 3 [root@bogon data]# useradd testbash 4 [root@bogon data]# useradd basher 5 [root@bogon data]# grep -E "^\<([^:]+\>).*\1$" /etc/passwd 6 sync:x:5:0:sync:/sbin:/bin/sync 7 shutdown:x:6:0:shutdown:/sbin:/sbin/shutdown 8 halt:x:7:0:halt:/sbin:/sbin/halt 9 nologin:x:4005:4005::/home/nologin:/sbin/nologin10 bash:x:4006:4006::/home/bash:/bin/bash