Linux Common Command Learning (i)

Document Operations Command:

LS Displays the current directory file CD into the directory PWD display the current file path mkdir Create directory rmdir Delete directory

Touch Add text file Stat View file Detail properties File View files encoded type RM Delete CP copy MV move

Text View command:

Cat-a display all content, including special symbols-e Displays the end of a line symbol-n Displays line numbers

More Page Backward

Less space page, b page back, enter the row, K forward,/find, Q exit

Head View Top N rows

Tail View the next n rows-f (see the end of the file, do not exit waiting for new additions to be displayed) to monitor real-time write information

Tail-f/etc/passwd tail-5/etc/passwd display after 5 lines or-N 5

Text Processing:

Cut text Cut command-D specify delimiter, default 1 spaces-F Specify the fields to display

Cut-d:-F 1 To: Split the text and display the first character 1,3 show the first and third 1-3 shows 1 to 3

Sed/awk Text Processing

Join text merge grep query command

Text sort:

Sort by comparison of character size, default ASCII sort-N numeric size sort-R reverse order-T Specify field separator

-k specifies from which location the delimiter begins. -u same row only displays one-F ignore character case

SORT-T:-k3/etc/passwd to: Start sorting from the third character for the separator

Uniq adjacent and the same repeating row displays only one-D only displays duplicate rows-D displays all the rows that are duplicates-C displays all rows and displays the number of repetitions

Text Statistics Command WC (Word count)

How many lines in the WC statistic text, number of words, bytes (spaces),-l show only the number of lines------the number of words-m characters--the longest line of-L contains how many characters

Character Processing command tr convert or delete characters

TR [option]: SET1 format TR ' ab ' AB ' A replaced by a b replaced by B-character comparison

TR ' AB ' AB ' </etc/passwd will convert all of the files in a and B to uppercase Ab ' A-Z ' A-Z

tr-d ' AB ' delete characters A and b

Time command:

Date current time clock software time Hwclock hardware time Cal Calendar

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Linux Common Command Learning (i)