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getopts is a built-in Unix shell command for parsing command-line arguments. It is designed to process command line arguments that follow the POSIX Utility Syntax Guidelines, based on the C interface of getopt. The predecessor to getopts was the external program getopt by Unix System Laboratories.
In computer operating systems, mkfs is a command used to format a block storage device with a specific file system. The command is part of Unix and Unix-like operating systems. In Unix, a block storage device must be formatted with a file system before it can be mounted and accessed through the operating system's filesystem hierarchy.
Some commands, such as echo, false, kill, printf, test or true, depending on your system and on your locally installed version of bash, can refer to either a shell built-in or a system binary executable file. When one of these command name collisions occurs, bash will by default execute a given command line using the shell built-in. Specifying ...
A shell script can provide a convenient variation of a system command where special environment settings, command options, or post-processing apply automatically, but in a way that allows the new script to still act as a fully normal Unix command. One example would be to create a version of ls, the command to list files, giving it a shorter ...
But the version on the right always creates an empty file because the C shell's order of evaluation is to look for and evaluate I/O redirection operators on each command line as it reads it, before examining the rest of the line to see whether it contains a control structure.
Modify the last modification time of a file. MIC RFC 2228 Integrity Protected Command MKD RFC 959 Make directory. MLSD RFC 3659 Lists the contents of a directory in a standardized machine-readable format. MLST RFC 3659 Provides data about exactly the object named on its command line in a standardized machine-readable format. MODE RFC 959
A Unix shell is a command-line interpreter or shell that provides a command line user interface for Unix-like operating systems. The shell is both an interactive command language and a scripting language , and is used by the operating system to control the execution of the system using shell scripts .
Write the name list of an object file: Version 1 AT&T UNIX nohup: Process management Mandatory Invoke a utility immune to hangups: Version 4 AT&T UNIX od: Misc Mandatory Dump files in various formats Version 1 AT&T UNIX paste: Text processing Mandatory Merge corresponding or subsequent lines of files Version 32V AT&T UNIX patch: Text processing ...