Linux Learning Notes < three >--common view text commands and Text processing commands

To view text:

1.cat: Connect and display text

Inverted display of the Tac:cat

-N: Add rows at the beginning of each line display

-E: line breaks displayed per row

-A: Displays all, including text and various special symbols

The text newline character for Linux is $, and the text line break for Windows is $+enter

2. More and less for split-screen display

MORE: Turn back, turn to the end and quit.

Less: Turn back, turn to the end and not automatically exit

The more and less display Windows operate:

Turn back one page: Space key

Turn One page forward: B key

Exit display window: Q key

3.head: View Top N rows

Tail: View after n rows

-N Number =-Number: View how many rows

No option, the default is to display 10 rows

Tail-f: View the end of the file, does not automatically exit, you can wait to show other users later append to this file new content.

Text Processing:

1.cut: Crop text after display

-D: Specifies the field delimiter, which is the default space

-F: Specify the fields to display

Example: cut-d:-f1,3/etc/passwd

cut-d:-f1-3/etc/passwd

2.sort: Sort text after display

-N: Numeric sorting

-R: Descending

-T: Field delimiter

-K: One of the fields is sorted by keyword

-U: The same row is only displayed once after sorting

-F: Ignore character case when sorting

Example: sort-t:-k3/etc/passwd to compare the third field in the/etc/passwd with: separate, left-to-right

3.uniq: When no option is added, duplicate rows are displayed only once, and non-repeating rows are displayed correctly

-C: On the default basis, the beginning of the line with the number of repetitions, normal display 1, there are repeated display repeat number

-D: Show only duplicate rows

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4.WC (Word count): text statistics

-L: Displays the number of lines of text

-W: The number of words that display text

-C: The number of bytes (characters) to display text

-L: The number of bytes (characters) that show the longest line

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5.tr: Convert or delete characters, not with access parameters, need to use with piping

format; tr [OPTION] ... SET1 [SET2]

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Linux Learning Notes < three >--common view text commands and Text processing commands