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This article mainly shows you "Linux common command cat how to use", the content is easy to understand, clear, hope to help you solve doubts, the following let the editor lead you to study and learn "Linux common command cat how to use" this article.

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

Syntax format cat [- AbeEnstTuv] [--help] [--version] fileName parameter description:-n or-number: numbering all output lines 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 content of the textfile1 document with a line number into the textfile2 document:

Cat-n textfile1 > textfile2 appends 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.txtcat 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:

\ 1. OUTFILE refers to the name of the output image file.

\ 2. IMG_FILE refers to the image file.

\ 3. If you write back to device from an image file, the device capacity needs to be the same.

\ 4. It is usually used to make a boot disk.

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