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The content of this article mainly focuses on how to use the Linux cat command. The content of the article is clear and well-organized. It is very suitable for beginners to learn and is worth reading. Interested friends can follow the editor to read together. I hope you can get something through this article!

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

Permission to use

All users

Grammatical format

Cat [- AbeEnstTuv] [- help] [- version] fileName

Parameter description:

-n or-number: number the number of lines of all output starting with 1.

-b or-number-nonblank: similar to-n, except that blank lines are not numbered.

-s or-squeeze-blank: when you encounter more than two consecutive blank lines, replace them with blank lines on one line.

-v or-show-nonprinting: use ^ and M-symbols, except for LFD and TAB.

-E or-show-ends: displays $at the end of each line.

-T or-show-tabs: displays the TAB character as ^ I.

-A,-show-all: equivalent to-vET.

-e: equivalent to the "- vE" option

-t: equivalent to the "- vT" option

Example:

Enter the contents of the textfile1 document with a line number into the textfile2 document:

Cat-n textfile1 > textfile2

Append the contents of the textfile1 and textfile2 documents to the textfile3 document after adding line numbers (no blank lines):

Cat-b textfile1 textfile2 > > textfile3

Clear / etc/test.txt document contents:

Cat / dev/null > / etc/test.txt

Cat can also be used to make image files. For example, to create an image file of a floppy disk, put the floppy disk away and enter:

Cat / dev/fd0 > OUTFILE

Conversely, if you want to write image file to a floppy disk, type:

Cat IMG_FILE > / dev/fd0

Note:

OUTFILE refers to the name of the output image file. IMG_FILE refers to an image file. If you write back to device from an image file, the device capacity needs to be the same. It is usually used to make a boot disk.

What is Linux system Linux is a free-to-use and free-spread UNIX-like operating system, is a POSIX-based multi-user, multi-task, multi-threaded and multi-CPU operating system, using Linux can run major Unix tools, applications and network protocols.

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