Shulou(Shulou.com)06/03 Report--

File type recognition command: file

Syntax: file a file name or multiple files as a parameter

Note: file identifies the lifetime of the file according to the magic number. Magic numbers are saved in even bytes of each file.

Question: the concept of magic numbers?

Command to count lines, words, and characters: wc

Syntax: wc 1 file name or more

Optional:-l counts only lines;-w counts words;-c counts characters

Note: when you count multiple files with the wc command, the result of each file is on one line, and the cumulative value is displayed on the last line.

Octal display of data command: od

Syntax: od file name

Optional:-b displays each character separately;-bc the first line shows the octal of the ASCII code; the second line shows printable characters and escape characters.

File comparison command cmp

Syntax: cmp file name

Tip: cmp compares two files character by character, and when you find an unequal character, you output its location. If the two files figure out, no information is displayed.

The command comm. Find the similarities between two files.

Grammar: comm. File name 1 file name 2

Tip: line 1 is unique to file 1, column 2 is unique to file 2, and column 3 is common to both files.

File conversion command: diff

Syntax: diff file 1 file 2

Tip: it will also give some hints to modify those contents of a file to make the two files the same.

Question: what does the instruction represent in the diff prompt?

Note: each instruction combines the address with the behavior as imposed on the first file.

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