Linux Operations Learning-6th Week jobs

Exercises:
1. Copy the/etc/rc.d/rc.sysinit file to the/tmp directory and add # to the beginning of the line with at least one whitespace character in the/tmp/rc.sysinit file;

:%[email protected]^[[:space:]]\[email Protected]#&@g

2, copy/boot/grub/grub.conf to/tmp directory, delete the blank character of the beginning of the/tmp/grub.conf file;

:%[email protected]^[[:space:]]\[email Protected]@g
3. Delete the # and whitespace characters in the/tmp/rc.sysinit file that begin with # and followed by at least one white-space character in the line;

:%[email protected]^#[[:space:]]\[email Protected]@g
4. Add # to the beginning of the first three lines in the/tmp/grub.conf file;

: 1,[email protected]*@#&@g
5. Change the last 0 of all enabled=0 or gpgcheck=0 in the/etc/yum.repos.d/centos-media.repo file to 1;

:%[email protected]\ (enabled\|gpgcheck\) [email protected]\[email protected]

6, every 4 hours to perform a backup of the/etc directory, back up to the/backup directory, the saved directory name is shaped like etc-201504020202;

0 */4 * * * root cp-r/etc//backup/etc-$ (date +%y%m%d%h%m)

7, weekly 2,4,6 backup/var/log/messages file to/backup/messages_logs/directory, save the file name like messages-20150402;

0 0 * * 2,4,6 root cp-r/var/log/messages/backup/messages_logs/messages-$ (date +%y%m%d)
8, every two hours every day to take the current system/proc/meminfo file all the information in the beginning of S to the/stats/memory.txt file;

0 */2 * * * root grep "^s"/proc/meminfo >>/stats/memory.txt
9, working days of work time, every two hours to perform the echo "Howdy";

0 9-17/2 * * 1-5 root echo "Howdy"
Script Programming Exercises:
10, create the directory/tmp/testdir-the current date and time;
#!/bin/bash
mkdir/tmp/testdir-$ (Date +%y%m%d%h%m)

11. Create 100 empty files in this directory: file1-file100;

#!/bin/bash
for (i=1;i<=100;i++) {
touch/tmp/testdir-$ (date +%y%m%d%h%m)/file$i
}
12. Display the user name of the user who is located in the/etc/passwd file in the first even row;
#!/bin/bash
Sed-n ' n;p '/etc/passwd | Cut-d:-f1
13. Create 10 user user10-user19, password and user name;

#!/bin/bash
for (i=10;i<=19;i++) {
Useradd user$i
echo "User$i" | passwd--stdin user$i &>/dev/null
}
14, create 10 empty files file10-file19 in/tmp/;
#!/bin/bash
for (i=10;i<=19;i++) {
Touch/tmp/file$i
}
15. Change the file10 and the genus to user10, and so on.
#!/bin/bash
for (i=10;i<=19;i++) {
Chown user$i:user$i file$i
}

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Linux Operations Learning-6th Week jobs