Linux Three Musketeers Enterprise-class classic face question answer combat

Linux Three Musketeers business-class classic face question answer combat

Description: From the morning old boy education online class one of the students ' face examination questions and the student gives the answer to organize

Interview Question: Please filter oldboy.log in the device: {} how many times Oldboy, filtered and counted out.

Oldboy is a linuxer.

Device: {

Oo

Oldboy

No SQL

This is log

Niu Niu

}

Oldboy

Device: {

Oldboy

No SQL

This is log

Niu Niu

}

Oldboy

Device: {

Oldboy

No SQL

This is log

Niu Niu

}

Device: {

Oldboy

No SQL

This is log

Niu Niu

}

Solution: The use of sed and awk to take the interval:

1) Use the number of rows to take the interval

[email protected] ~]$ seq >test.log

[Email protected] ~]$ sed-n ' 2,5p ' Test.log

2

3

4

5

[Email protected] ~]$ awk ' nr>1&&nr<6 ' Test.log

2

3

4

5

2) using string matching to fetch intervals

The subject can be "device" at the beginning of "}" end, and then the inside of the matching string to filter the count on it.

The method to take the interval:

Sed-n '/^device/,/\}$/p ' Oldboy.log

awk '/device: {/,/}/' Oldboy.log

Tips:

sed-n '/ interval start identification /,/ interval End ID /p ' oldboy.log

3) Complete answer to the question: here are 3 ways

Sed-n '/^device/,/\}$/p ' oldboy.log|grep-w "Oldboy" |wc-l

awk '/device: {/,/}/' oldboy.log|grep-w oldboy|wc-l

awk '/device: {/,/}/{if ($0== "Oldboy") count++}end{print count} ' Oldboy.log

Demonstrate:

[Email protected] ~]$ sed-n '/^device/,/\}$/p ' oldboy.log|grep-w "Oldboy" |wc-l

4

[[email protected] ~]$ awk '/device: {/,/}/{if ($0== "Oldboy") count++} end{print count} ' Oldboy.log

4

[Email protected] ~]$ awk '/device: {/,/}/' oldboy.log|grep-w oldboy|wc-l

4

4) Considering the commonality in the enterprise of the face question, a line may also have multiple Oldboy, that is, the original question should read as follows:

[email protected] ~]$ cat Oldboy.log

Oldboy is a linuxer.

Device: {

Oo

Oldboy Oldboy oldboy

No SQL

This is log

Niu Niu

}

Oldboy

Device: {

Oldboy Oldboy

No SQL

This is log

Niu Niu

}

Oldboy Oldboy

Device: {

Oldboy Oldboy

No SQL

This is log

Niu Niu

}

Device: {

Oldboy Oldboy

No SQL

This is log

Niu Niu

}

Oldboy

So the best answer is:

Sed-n '/^device/,/\}$/p ' oldboy.log|xargs-n 1|sort|grep-w oldboy|wc-l

awk '/device: {/,/}/' oldboy.log|grep-w oldboy|tr "" \ n "|wc-l

Demonstrate:

[Email protected] ~]$ sed-n '/^device/,/\}$/p ' oldboy.log|xargs-n 1|sort|grep-w oldboy|wc-l

9

[Email protected] ~]$ awk '/device: {/,/}/' oldboy.log|grep-w oldboy|tr "" \ n "|wc-l

9

Ordinary people can be on the topic, the expert's answer to consider versatility, master and low hand difference lies in this!

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Linux Three Musketeers Enterprise-class classic face question answer combat