Seventh week job "Linux Micro Jobs"

1. Write a script to determine whether the shell of all users on the current system is a login shell (that is, the user's shell is not/sbin/nologin), the number of these two types of users, and the string comparison;

#!/bin/bashlogin= ' grep-v '/sbin/nologin$ '/etc/passwd | Wc-l ' nologin= ' grep '/sbin/nologin$ '/etc/passwd | Wc-l ' echo ' can be logged in user $login "echo" non-logged in user total $nologin "

Second, write a script

(1) Obtain the host name of the current host and save it in the hostname variable;

(2) Determine if the value of this variable is localhost, and if so, modify the current hostname to www.magedu.com;

(3) Otherwise, the current host name is displayed;

#!/bin/bashhn= ' hostname ' if [[$hn = = ' localhost ']];then hostname wwww.magedu.comelse echo $hnfi

Three, write a script to complete the following functions

(1) Pass a disk device file path to the script to determine whether the device exists;

(2) If present, displays all the partition information on this device;

[[email protected] shell]# cat disk.sh #!/bin/bashdisk= ' fdisk -l |  grep -o  "^ disk  /dev/sd[a-z]"  | awk  ' {print $2} ' for i in $ diskdoecho  "Disk device $i"         partition= ' fdisk -l |  egrep -o  "^${i}[1-9"         df -h  $partition         echodone [[email protected] shell]# ./ disk.sh  Disk device/DEV/SDA file system          capacity    used    available   used%  mount point/dev/sda1       477m   94m  354m    21% /boot/dev/sda2        75g  1.6g    69G    3% /devtmpfs         1.9g     0  1.9g    0% /dev  Disk device/DEV/SDC file system           capacity    used    available   used%  mount point/dev/sdc1        9.8G   37M  9.2G    1% /data2/dev/sdc2        9.8g   37m  9.2g    1% / data3  Disk device/dev/sdb file system          capacity    used    available   used%  mount point/dev/sdb1       9.8g   37m  9.2g     1% /data1

Four, write a script to complete the following functions

The script can accept a parameter;

(1) If the parameter 1 is quit, the exit script is displayed, and the normal exit is performed;

(2) If the parameter 1 is yes, the execution script is displayed;

(3) Otherwise, the parameter 1 is any other value, performs an abnormal exit;

#!/bin/bashread-p "Please input option:" Optioncase $option Inquit) echo "quit" exit 0;; YES) echo "continue";; *) echo "error" exit 1;; Esac

Five, write a script to complete the following functions

Pass a parameter to the script, this parameter is one of gzip, bzip2 or XZ;

(1) If the value of parameter 1 is gzip, use the TAR and gzip archive to compress/etc directories into the/backups directory and name/backups/etc-20160613.tar.gz;

(2) If the value of parameter 1 is bzip2, use tar and bzip2 archive to compress/etc directory to/backups directory, and named/backups/etc-20160613.tar.bz2;

(3) If the value of parameter 1 is XZ, then the tar and XZ archives are used to compress/etc directories into the/backups directory and named/backups/etc-20160613.tar.xz;

(4) Any other value, the error compression tool is displayed, and an abnormal exit is performed;

#!/bin/bashread -p  "please select the  compression format in  (GZIP|BZIP2|XZ) " optioncase  $option  ingzip)          tar -zcf /backups/etc-' date  "+%Y%m%d" '. tar.gz /etc  &> /dev/null        ;; bzip2)         tar -jcf /backups/etc-' date  "+%Y%m%d" '. tar.bz2 /etc &> /dev/null        ;; XZ)         tar -jcf /backups/etc-tar -' date  ' +%Y%m %d "' .tar.xz /etc &> /dev/null        ;; *)         echo  "error!"         exit 1        ;; Esac 

Six, write a script, accept a path parameter:

(1) If it is an ordinary document, it can be accessed normally;

(2) If it is a catalog file, then the CD command is available for it;

(3) If the file is a symbolic link, the description is a access path;

(4) Other is impossible to judge;

#!/bin/bashread-p "Please enter a path:" Pathif [-F $path];then echo "Files Accessible" elif [-D $path];then echo "Directory accessible" elif [-H $path];then echo "This is path" else echo "something Error" fi

Seven, write a script, get the host name of the current host, judge

(1) If the host name is empty or localhost, or "(none)", it is named mail.magedu.com;

(2) Otherwise, display the existing host name can be;

#!/bin/bashhn= ' hostname ' IF [-Z $hn-o $hn = = "localhost"-o $hn = = "(none)"]];then hostname mail.magedu.com Echo "Modify host Name: mail.magedu.com" Else echo "current hostname: $HN"

8, write a script, accept a user name as a parameter;

(1) If the user's ID number is 0, it is displayed as an administrator;

(2) If the user's ID number is greater than 0 and less than 500, it is displayed as a system user;

(3) Otherwise, it is displayed as a normal user;

#!/bin/bashwhile truedoread-p "Please enter a username:" Usernameif!        ID $username &>/dev/null;thenecho "no This user" elsebreakfidoneuserid=$ (id-u $username) if [[$userid-eq 0]];then echo "$username is admin" elif [[$userid-lt]];then Echo ' $username is the system user "else echo" $username is a normal user "fi

Seventh week job "Linux Micro Jobs"