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Xiaobian to share with you what linux intercepts commands, I hope you read this article after the harvest, let us explore the method together!

Linux interception commands are: 1, cut command, according to the table character or specified delimiter interception string;2, printf command, output specified content, usually used with awk command;3, awk command, you can intercept the string by space;4, sed command, the output of other commands as the output of the stream editor.

The Linux command is:

I. Cut the command

cut: Truncate a string according to a literal or specified delimiter

-d Specify delimiter

-f Specifies the truncated columns, separated by ","

Examples:

cut -d ":" -f1,3 /etc/passwd

Print and printf commands

Command format: printf "Output format Output type" "Output content"

printf: Output the specified content, usually used with awk command

%ns indicates the number of output string types

%ni indicates the number of output integer types

% m.nf indicates the type of floating point number output

print: Same as printf, but wraps when outputting strings

Examples:

printf "%s\t%s\t%s\t\n" 1 2 3

3. awk command

awk: String can be truncated by spaces

Command format: awk '{condition1}{action1}{condition2}{action2}'

BEGIN is processed before interception

END processed after interception

FS Specify delimiter

Examples:

df -h | grep vda1 | awk '{printf $1 "\t" $5}' |cut -d "%" -f1 #Use awk to count root partition usage awk 'BEGIN{print "Start counting results of Class 3"}END{print "End of results"}{print $2 "\t" $5}' student.txt cat /etc/passwd| grep /bin/bash | grep -v root | awk 'BEGIN{FS=":"}{print $1 "\t" $5}' #Find regular users in the system

IV. SED Command

1. Command format: sed [option] '[action]'

sed: stream editor that takes the output of other commands as output

-n Output only information edited by sed command

-e Multiple commands operate together, separated by ";"

-i Save modified content to original file

2. Action commands include

a appends the specified string to the specified line

i inserts the specified string before the specified line

d Delete the specified row

c Replace by line

s Replace by string format: /s/new string/old string/g

p Print line

Examples:

sed '2p' ./ sugar/student.txt #Print the second line of student.txt sed '2a hahaha' student.txt #Append the string hahahaha to the second line of the student.txt file sed '2i hahaha\xixixi' student.txt #Insert hahaha and xixixi before the second line of student.txt file sed '2,4d' student.txt #Delete lines 2 to 4 of student.txt file sed '2c no such man' student.txt #Replace the second line of student.txt with no such man sed '2s/HubuSugar/igoodful/g' student.txt #Replace HubuSugar with igoodful in student.txt file sed -e '2d;3c no such man' student.txt #Delete the second line of the student.txt file, and replace the third line with no such man. After reading this article, I believe you have a certain understanding of the commands intercepted by linux. If you want to know more about it, welcome to pay attention to the industry information channel. Thank you for reading!

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