Linux cat Command
Command: cat
The cat command after the file reached the basic connection string output (screen or add> fileName to another file)Permissions
All users
Syntax
cat [-AbeEnstTuv] [--help] [--version] fileName
Parameter Description:
-n or --number starting from 1 to all outputs the line number
-b and -n --number-nonblank or similar, except for the blank line is not numbered
-s or --squeeze-blank when faced with two blank lines or more consecutive lines, with a blank line on the substitution line
-v or --show-nonprinting
Example:
The contents of the file textfile1 with a line number in this file after entering textfile2
cat -n textfile1 > textfile2
The contents of the file textfile1 and textfile2 with a line number (without blank lines) after the content is appended to textfile3 years.
cat -b textfile1 textfile2 >> textfile3
Empty the contents of the file /etc/test.txt
cat /dev/null > /etc/test.txt
cat can also be used to create an image file. For example, to make the floppy disk image files, floppy put away after play
cat /dev/fd0 > OUTFILE
Conversely, if you want to write the floppy disk image file, please call
cat IMG_FILE > /dev/fd0
NOTE:
- 1. OUTFILE refers to the image output file name.
- 2. IMG_FILE refers to the image file.
- 3. If the write-back from the image file when the device, device capacity and need considerable.
- 4. typically used in the production boot disk.