Linux case (1)

1, the creation of a 10G file system, the type of EXT4, requires the boot can be automatically mounted to a separate data/data directory;

(1) Creating 10G partitions

# Cat << EOF | FDISK/DEV/SDA > N > > +10g > W > EOF # partx-a/DEV/SDA # partx-a/DEV/SDA

(2) formatting

# mke2fs-t Ext4/dev/sda5

(3) Create a directory and edit the/etc/fstab file

# mkdir/data/dev/ada5/data EXT4 Defaults 0 0

2, display the ' Netstat-tan ' command results with ' LISTEN ' followed by 0, one or more blank characters end of the line;

# Netstat-tan | grep "listean[[:space::]]*"

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3, add user Nginx, Zabbix, Tomcat, Nologin and Hadoop users (nologin user's shell is/sbin/nologin), and then find the/etc/passwd file in the same user name and shell name of the row;

# useradd nginx# useradd zabbix# useradd tomcat# useradd hadoop# useradd-s/sbin/nologin nologin# grep-e "(^[[:alnum:]]* \>). *\1$ "/etc/passwd

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4, find a word in the/etc/rc.d/init.d/functions file (the middle of the word can be underlined) followed by a set of parentheses line;

# grep-e "_[[:alpha:]]*\ (\)"/etc/init.d/functions

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5, use echo to output a path, and then egrep find its path base name; Further use Egrep to remove its directory name (note that the directory name, not the directory path);

(1) Take path base name

# echo "/etc/init.d/functions/" | Egrep-o "[[: alnum:]]*/?$] | Cut-d/-F1

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6. Find all files that are not root, bin or hadoop under the/usr directory;

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

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7, one day the system was invaded, hackers in your system to leave the Trojan file:

You now need to find all the files on the current system that are not owned by the master or group and have been visited in the last week;

In addition, it is necessary to find all files of more than 20k and type ordinary files in/etc directory;

# Find/-nouser-o-nogroup-atime-7

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# find/etc-size +20k-type f-exec ls-lh {} \;

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8, create the directory/test/data, let a group of ordinary users have write permissions to it, and all the files created by the group is the directory belongs to the group; In addition, each user can only delete their own files.

# mkdir-p/test/data# chown hadoop.hadoop/test/data# usermod-g hadoop tomcat# useradd-g hadoop nginx# chmod g+ws,o+t/ Test/data

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Linux case (1)