LINUX-12 Basic command of Cat,more,head, tail, Tr,od,wc,cut,diff

1. Cat commands for viewing plain text files (shorter), format: "cat[options [File]"

View text files

Cat file name

Cat parameters

Parameters	Role
-N	Show line Numbers
-B	Display line numbers (not including spaces)
-A	Displays invisible symbols, such as spaces, tab

2. The more command is used to view plain text files (longer) format: "more[Options" File "

View text files

[[email protected] etc]# more   file name

More parameters

Parameters	Role
-Digital	Number of pre-displayed rows (default is one page)
-D	Display prompt statement and error message

3. Head command to view the first n rows of text

View the first 20 lines of text

Head Ten file names

Head command

Parameters	Role
-N 10	Show 10 rows
-n-10	Normal output without showing the last 10 rows

　　

4. Tail view Plain text documents with the following n-line format: "tail [options] [file]"

View the following 20 lines of the text file:

Tail  -  Filename

Tail parameters

Parameters	Role
-N 10	Show back 10 rows
-F	Refresh the displayed content continuously

5. The TR command is used to convert characters in a text file in the format: "tr[original character [target character]"

Cat tr. Tex | TR [A-z] [A-z]

6. The OD command is used for viewing files in special formats. Format as "od[options [File]"

7. The WC command is used to count the number of lines, words, and bytes of the text, formatted as: "wc[parameter] text"

WC command

Parameters	Role
-L	Number of rows displayed
-W	Show only the number of words
-C	Show only bytes

View the number of users in the current system

WC -l/etc/passwd

8. Cut

9. The diff command is used to compare multiple file literals in the format: "diff[parameter] file"

Diff parameter

Parameters	Role
-B	Ignore differences caused by whitespace
-B	Ignore differences caused by whitespace
-brief OR-Q	Report only if there is a discrepancy
-C	Use context output format

Compare the differences between 2 files

[Email protected] etc]#  diff Diff_a.txt  diff_b.txt

Show only the comparison results, same or different

diff --brief Diff_a.txt diff_b.txt

LINUX-12 Basic command of Cat,more,head, tail, Tr,od,wc,cut,diff