The command line interface is primarily designed according to the POSIX and GNU specifications.
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Reference: [Linux Command Option Customs (General Option List)](https://debimate.jp/2019/02/23/linux-command-option%E3%81%AE%E6%85%A3%E7 % BF% 92% E4% B8% 80% E8% 88% AC% E7% 9A% 84% E3% 81% AAoption% E4% B8% 80% E8% A6% A7 / # Command_Option% E3% 81% AB% E9% 96% A2% E3% 81% 99% E3% 82% 8BPOSIX% E8% A6% 8F% E6% A0% BC)
POSIX 【 Portable Operating System Interface 】 POSIX is a standard that defines standards such as how to call from a program, mainly for functions common to UNIX-based OSs.
API specifications and standard library functions for using system calls that call kernel functions from C language are defined, and programs developed using only POSIX specifications are the same for any POSIX-compliant OS. Can be operated.
In addition to the API, standards are also set for the shell command system, process and thread specifications, file and directory configurations, system database formats such as password files, and archive file formats.
Reference: What is POSIX (Portable Operating System Interface) --IT Glossary e-Words
--Options start with "-" and the option string is one alphanumeric character --When using multiple options, you can omit "-" and connect (example: "-a -b -c" can be written as "-abc") --Put a space between the option and the option argument --Options must exist before command line arguments --Options can be omitted when executing the command line
**GNU 【 GNU is Not Unix 】 ** GNU is a project to develop and publish a group of software related to UNIX-like OS using only free software (especially open source software). It was founded by Richard M. Stallman and is being promoted by the Free Software Foundation (FSF), which he represents.
The names of software provided as part of GNU often include "GNU" as part of it (GNU Emacs, etc.) or begin with "g" (gcc, glibc, etc.).
Reference: What is GNU-IT Glossary e-Words
In addition to recommending compliance with the POSIX standard, the following specifications have been added.
-“–” And optional long name support (eg “–version” corresponding to “-v”) --Support for concatenated options and optional arguments (eg –test = path) --Minimum support for "–version" (version display) and "–help" (help or Usage display)
| Short Option | Long Option | Function (Command that implements the option) |
|---|---|---|
| a | all | Processing for all files and all users (du, nm, uname) |
| b | bytes、blocks | Set the size of bytes and blocks (du, df) |
| c | cmd | Set Command and Option to pass to subprocess (bash, python) |
| d | debug | Output debug message (many Commands) |
| e | exclude | Set exclusion target (example: file)(rync) |
| f | file | Set the file to use (awk, make, sed, tar) |
| g | group | Set group (install) |
| h | help | Show help on using Command (many Commands) |
| i | inodes | Show inode information instead of block usage(ls、df) Besides inodes, interactive also exists (rm, mv) |
| j | jobs | Set the number of jobs (make) |
| k | keep | Suppress deletion of files, messages, resources, etc. (passwd, bzip) |
| l | list | Show list of files, directories, etc. (unzip, ls) |
| m | mode | Permission settings (install, mkdir) |
| n | number | Display numbers (example: line numbers)(head、tail、grep) |
| o | output | Output file name and output file path settings (many Commands) |
| p | a diversity of | See references |
| q | quiet | Suppress message output (many Commands) |
| r | recursive | Perform processing recursively (grep, chgrp, choose, cp, ls, diff, rm) |
| s | silent | Suppress message output (many Commands) |
| t | a diversity of | See references |
| u | update | Perform update (apt, yum, cp, mv, tar) |
| v | version | Display program version information (many Commands) |
| w | width | Width setting (ls, ptx) |
| x | extract | Display a list of files extracted from archives (tar, zip) |
| y | yes | In the user confirmation process, it is considered that the user answered yes to all confirmation items (apt, yum). |
| z | zip(compress) | Enable compression (tar) |
[Linux Command Option Customs (General Option List)](https://debimate.jp/2019/02/23/linux-command-option%E3%81%AE%E6%85%A3%E7%BF % 92% E4% B8% 80% E8% 88% AC% E7% 9A% 84% E3% 81% AAoption% E4% B8% 80% E8% A6% A7 / # Command_Option% E3% 81% AB% E9% 96% A2% E3% 81% 99% E3% 82% 8BPOSIX% E8% A6% 8F% E6% A0% BC)
Option Table (GNU Coding Standards)
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