Common shell commands

nl

Show file line number
nl myscript

Printf

formatting text
%[-+]m.nx
-The starting position from the beginning of the line
m represents the width of the field and N indicates the maximum width of the field
S: String.
C: Character.
D: number.
X:1 6 binary number.
O:1 0 binary number.

SZX1000366880:~ # printf "0x%x\n" 12000x4b0

Script

Record the operation process

scrpit mycmd.log

Strings

To view text in a binary file

strings file

Uname

Displays information about the current operating system

Wait ProcessID

Wait for process to end

Wc

Count characters, number of lines, number of words

wc -cwc -lwc -w

Whereis

Displays the path of the binaries and their online manuals

Whoami/who

Current login Name

BaseName

Detach a file name from a path

DirName

Detach a part of the file name from the path

Cat file1 file2 > File3

Merge 2 files

Diff

Comparison of two files

dircmp

Comparison of two folders

File filename

Determine file type

Fuser-u/DEV/SDB1

Show all processes that access the device
···
Fuser-k file kills all processes that access files
···

Common shell commands