Shell exercise -15

Question requirements
Write a shell and see if there are custom users (ordinary users) in your Linux system. If so, how many?

Core points
centos6 uid>=500
eentos7 uid>=1000

awk -F’:”$3>=500′ /etc/ passwd|wc -l centos 5 6
awk -F’:”$3>=1000′ /etc/passwd|wc -l centos 7
awk -F’release”{print $2}’ /etc /redhat-release|cut -d’.’ -f1

Reference answer

#!/bin/bash
v=`awk -F'release ''{ print $2}' /etc/redhat-release |cut -d'.' -f1`
user()
{
 if [$1 -eq 0 ]
 then
 echo "The system has no custom users"
 else
 echo "There are custom users in the system, there are $1"
 fi
}
case $v in 
 5|6)
 n=`awk -F':''$3>=500' /etc/passwd|wc -l`
 user $n
 ;;< br /> 7)
 n=`awk -F':''$3>=1000' /etc/passwd|wc -l`
 user $n
 ;;
 *)
 echo "Script error."
 ;;
esac

Question requirements

Write a shell script to check the usage of all disk partitions And the inode usage rate is recorded in a log file named after today’s date. When you find that a certain partition capacity or inode usage is greater than 85%, send an email to notify yourself.

Reference answer

#!/bin/bash
dir=/tmp/disk
d=`date +%F`
[email protected]

[ -d $dir] || mkdir $dir

df >> $dir/$d.log
df -i >> $dir /$d.log

df|sed '1d' |awk -F '+|%''$5>=85 {print $7}'> $dir/df.tmp
df -i|sed '1d' |awk -F '+|%''$5>=85 {print $7}'> $dir/df_i.tmp

n1=`wc -l $dir/ df.tmp|awk'{print $1}'`
n2=`wc -l $dir/df_i.tmp|awk'{print $1}'`

tag=0
if [$n1 -gt 0 ]
then
 if [$n2 -gt 0 ]
 then
 tag=11
 else
 tag= 10
 fi
else
 if [$n2 -gt 0 ]
 then
 tag=01
 else
 tag=00
 fi
fi

case $tag in
 11)
 python mail.py $mail "Disk space and inode usage is higher than 85%" "`cat $dir/df.tmp $dir/df_i.tmp|xargs`"
 ;;
 10)
 python mail.py $mail "Disk space usage is higher than 85%" "` cat $dir/df.tmp|xargs`"
 ;;
 01)
 python mail.py $mail "Disk inode usage is higher than 85%" "`cat $ dir/df_i.tmp|xargs`"
 ;;
 *)
 ;;
esac

Question requirements

One As a web application, the server has a directory (/data/web/attachment) that will be uploaded by users from time to time, but it is unknown when it will be uploaded. Therefore, we need to check whether there are new files generated every 5 minutes.

Please write a shell script to complete the test. If there are new files after the detection is completed, the list of new files needs to be output to a log divided into names by year, month, day, hour, and time.

Key points
find -mmin -5
date +%Y%m%d%H%M

#!/bin/bash
basedir=/ data/web/attachment
t=date +%Y%m%d%H%M

find $basedir/ -type f -mmin -5> /tmp /file.list
n=wc -l /tmp/file.list|awk'{print $1}'
if [$n -lt 0 ]
then
mv /tmp/file.list /tmp/$t.list
fi

Question requirements

Write a shell script to see which commands you use the most, List your most commonly used commands top10.

Reference answer

cat ~/.bash_history |sort |uniq -c |sort -nr |head -n 10

Question requirements

< p>If you need to execute a script every hour. To achieve this function in the script, when the time is 0 o’clock and 12 o’clock, you need to clear all the files in the directory /data/log/.

Note that you can only clear the contents of the file, not delete the file. At other times, you only need to count the size of each file, one file per line, and output to a log named by date and time.

You need to consider the files in the secondary, tertiary, …?? and other subdirectories under the /data/log/ directory.

Key points
find list all files
date +%H

file empty file

reference answer< /h4>

#!/bin/bash
dir=/tmp/log_stat
t=`date +%d%H`
t1=`date +%H`
logdir=/data/log

[ -d $dir] || mkdir $dir
[ -f $dir/$t.log] && rm -f $dir/$ t.log

if [$t == "00" -o $t == "12" ]
then
 for f in `find $logdir/ -type f `
 do
> $f
 done
else
 for f in `find $logdir/ -type f`
 do
 du- sh $f >> $dir/$t.log
 done
fi