Column Command

1.2 Directory Operation command 1.2.1 View directory the command for viewing directory content is LS, which displays the contents of the current directory by default, and can be viewed by giving one or more directory names at the location of the command line arguments. The syntax format for the command is: LS [options] ... [filename] ... the LS command has multiple command-line options, such as:-A: Lists all files, including those with "." First file;-D: If you are following a directory, use this parameter to output only the name of the directory;-L: Displays file entries in long format, including ...

The chmod command changes the access rights of a file or directory. Let's take a look at this document first. At the shell prompt, type: LS sneakers.txt the previous command shows this file information:-rw-rw-r--1 Test test 39 March 12:04 Sneakers.txt provides a lot of detail here. You can see who can read (R) and write (w) files, and who created the file (test), the group where the owner is located (Te ...).

1.4 File permissions operation in a multi-user operating system, for security reasons, each file and directory need to be given access rights, and the permissions of each user are strictly defined. At the same time, users can give their own files the appropriate permissions to ensure that others can not modify and access. 1.4.1 Change File Master Linux assigns a file owner to each file, called the file Master, and the control of the file depends on the file master or Superuser (root). The creator of the file or directory has special rights to the files or directories created. All relationships in a file can be changed ...

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What is a process? Simply put, the system is running the program. What if we want to know which programs are running in the current system? It's easy to use the top command to get what you want. We enter in the terminal: top, see what is displayed? Wow, so many programs are running in the system (each line represents a program)? 　　What do the above columns mean? The pid:pid is the number that the system is assigned to per program, or process itself. Because the system has to track it after the program is started, why? Because at least we have to find it.

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Qpfcalc is a pfcalc qt front end, using a command-line interface for the friction calculator. It resembles the Gpfcalc, the gtk++ front end of the Pfcalc. Qpfcalc has two versions: for Windows and Linux. The Linux version is easy to compile and run on a UNIX-like operating system, and the Pfcalc backend must first be installed for the application to function properly. For Windows versions, all required files without Qpfcalc distribution can be run, including Pfcalc ...

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1. Export Registry format: regedit/l:system/r:user/e Filename.reg regpath Meaning:/L system Specifies the path of the System.dat file. /r user Specifies the path to the User.dat file. E Filename.reg Specifies the action that the table editor will export to that reg file. Regpath: Specifies which registry branch to export and, if omitted, exports the entire registry. 2.