Marco 2016 new Linux+python high-end Operation fourth week

Content of this week's job:

1, the Replication/etc/skel directory is/home/tuser1, requires/home/tuser1 and its internal files belong to the group and other users do not have any access rights.

# cp-r/etc/skel/home/tuser1 # chmod-r 700/home/tuser1/

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

# echo "hadoop:x:1003:" >>/etc/group

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3. Manually edit the/etc/passwd file to add a new line, adding user Hadoop, whose basic group ID is the Hadoop group ID number; its home directory is/home/hadoop.

# echo "Hadoop:x:1003:1003:hadoop:/home/hadoop:/bin/bash" >>/etc/passwd

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4. Copy the/etc/skel directory as/home/hadoop, which requires that the genus Group and other users of the Hadoop directory be modified without any access rights.

# cp-r/etc/skel//home/hadoop # chmod 700/home/hadoop/

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5, modify the/home/hadoop directory and all the internal files of the owner of Hadoop, belong to Hadoop group.

# chown-r hadoop.hadoop/home/hadoop/# or # chown-r hadoop:hadoop/home/hadoop/

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6. Display the lines in the/proc/meminfo file beginning with uppercase or lowercase s, in two ways;

# grep-i ' ^s '/proc/meminfo # grep ' ^[ss] '/proc/meminfo

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7. Display the default shell of the/etc/passwd file as a non-/sbin/nologin user;

# grep-v '/sbin/nologin '/etc/passwd | Cut-d:-f1

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8. Display the user whose default shell is/bin/bash in/etc/passwd file;

# grep '/bin/bash '/etc/passwd | Cut-d:-f1

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

# grep-o ' \b[0-9]\{1,2\}\b '/etc/passwd

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10. Display the line beginning with at least one blank character in/boot/grub/grub.conf;

# egrep ' ^[[:space:]]+ '/boot/grub/grub.conf

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11, the display/etc/rc.d/rc.sysinit file with the beginning of #, followed by at least one white space character, and then have at least one non-whitespace character line;

# egrep ' ^#[[:space:]]+[^[:space:]]+ '/etc/rc.d/rc.sysinit

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12, the Netstat-tan command execution results in the "LISTEN", followed by or with a blank character end of the line;

# Netstat-tan | Egrep ' listen[[:space:]]*$ '

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13, add user bash, Testbash, basher, Nologin (this user's shell is/sbin/nologin), and then find the current system on its user name and the default shell of the same user information;

# useradd Bash && useradd testbash && useradd basher && useradd-s/sbin/nologin nologin # grep ' ^\ ([[: alnum:]]\+\b\). *\1$ '/etc/passwd # or # awk-f ' [:/] ' $1== $NF {print $} '/etc/passwd

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This article is from the "ld0381 Learning Journey" blog, please be sure to keep this source http://ld0381.blog.51cto.com/3318114/1843141

Marco 2016 new Linux+python high-end Operation fourth week