1, CD
This is a very basic, we often need to use the command, which is used to switch the current directory, its parameters is to switch to the directory path can be absolute path, also can be a relative path,
2, the ls command
This is a very useful check file and directory command, list,
3, the grep command
The command is used to analyze a line of information, if there is the information we need, it will display the bank, the command is usually used with piping, for some command output is used to filter processing, etc.,
4, the cp command
This command is used to copy the file, a copy, it can also copy multiple files at once to a directory,
5, the mv command
This command is used to move files, directories or name change, a move,
6, the rm command
This command is used to delete a file or directory,
7, the ps command
This command is used to process and operation of a certain time point selection down and output,
8, kill command
This command is used to a work (% jobnumber) or is a PID (digital) transmits a signal, it is usually used with ps and the jobs command,
9, the chmod command
This command is used to change the file permissions, and at the same time, chmod can also use the u (user), g (group), o (other), a (all) and + (join), - (delete),=(set) with RWX collocation is to change the file permissions,
10, GCC command
For a use Linux development C program, this command is very important, it is used for the C language source program files, compiled into an executable program,

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