How to read the last few lines in cat in linux-Linux Operation and Maintenance-php.cn

In Linux, you can use the cat command with the tail command to view the last few lines of the file; the cat command is used to connect files and print to the standard output device, and the tail command can be used to view the contents of the file. When tail When the parameter of the command is set to "-n", the contents of the specified lines at the end of the file can be displayed. The syntax is "cat specified file | tail -n displays the number of the last few lines".

How to read the last few lines in cat in linux

#The operating environment of this tutorial: linux7.3 system, Dell G3 computer.

How to read the last few lines of cat in Linux

The cat (full English spelling: concatenate) command is used to connect files and print to the standard output device.

Syntax format

cat [-AbeEnstTuv] [--help] [--version] fileName

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Parameter description:

-n or --number: Number all output lines starting from 1 .
-b or --number-nonblank: Similar to -n, except that blank lines are not numbered.
-s or --squeeze-blank: When encountering more than two consecutive blank lines, replace them with one blank line.
-v or --show-nonprinting: Use the ^ and M- symbols except LFD and TAB.
-E or --show-ends : Show $ at the end of each line.
-T or --show-tabs: Display TAB characters as ^I.
-A, --show-all: Equivalent to -vET.
-e: Equivalent to the "-vE" option;
-t: Equivalent to the "-vT" option;

tail command can be used to view the contents of the file,

Command format:

tail [参数] [文件]

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Parameters:

-f Loop reading
-q Do not display processing information
-v Display detailed processing information
-c The number of bytes displayed
##-n Display the last n lines of the file

The example is as follows

Combine the three commands to view line x to line Y of the file.

Syntax format 1: Starting from line X, display line Y. That is, display the Y row

cat filename | tail -n +X | head -n Y

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Example: Display rows 1000 to 3000

cat requirements.txt | tail -n +3000 | head -n 1000

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*Note the order of the two methods

Decomposition:

tail -n 1000: Display the last 1000 lines

tail -n 1000: Start displaying from line 1000, and display the following
head -n 1000: Display the first 1000 lines
Recommended learning:
Linux video tutorial

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