LINUX-Frequently used commands
|cat command Display the contents of a file|
|cat [Option] file-name|
|The cat command will output the contents of the file specified as an argument to the standard output.|
If multiple files are specified as arguments, the contents of the specified files will be concatenated and displayed.
|Frequently used options|
|-v Display control codes and other hidden codes|
-e In addition to the functions of the ”-v” option, add $ to the end of the line and display it
-t In addition to the ”-v” option feature, display the Tab code as ^I
-s Replace multiple consecutive blank lines with a single blank line
|Example: Display the contents of a file.|
|$ cat temp1.txt |
|Example: Display with $ at the end of the line|
|$ cat -e temp1.txt ← Run it with the option “-e”.|
|Example: Display with TAB code|
|$ cat -t temp1.txt ← Run it with the option “-t”.|
C. ^|^| ghi—D.
↑The area where the tab is entered is shown as “^|”.
|Example: Replace multiple consecutive blank lines with a single blank line|
|$ cat -s temp1.txt ← Run it with the option “-s”.|
← A blank line becomes one line.