"Linux Commands-File management class" Cat command

Command Permissions : All Users
command usage : Cat [Parameter Options] [file]
command : output a file or standard input combination to a standard output or file

The options for the Cat command are as follows:

• -a,–show-all equals-vet.
• -b,–number-nonblank number of non-null output lines
• -E equals-ve
• -e,–show-ends Show "$" at the end of each line
• -n,–number all line numbers for the output
• -s,–squeeze-blank does not output multiple lines of blank lines
• -T vs.-VT equivalence
• -t,–show-tabs to display the ^i character as the Jump cell
• -U (ignored)
• -v,–show-nonprinting use ^ and M-references, except LFD and TAB
  Help display this help message and exit
  –version display version information and exit

If no file is specified, or if the file is "-", it is read from the standard input.

There is an unwritten rule in Linux, where an abbreviation for a letter begins with a minus sign, and all the arguments for the whole word are prefaced with two minus signs.

Example:

• Display file contents in standard output
  

• Display file contents and add line numbers in standard output
  

• Display the file contents in standard output and add $ at the end of each line
  

• Add line numbers and terminator $ per line
  

Two parameters exchangeable position

• Display multiple files simultaneously
  

Multiple files are output in turn (consider multiple files as one file)

• Output a file with line number and end-of-line terminator to a new file
  

Note:> is create file,>> is append file content

• Merge files can be implemented using the 5 and 6 above
  

Copyright NOTICE: This article for Bo Master original article, without Bo Master permission not reproduced.

"Linux Commands-File management class" Cat command