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It is useful for visualizing data that is not in a human-readable format, like the executable code of a program, or where the primary form is ambiguous (e.g. some Latin, Greek and Cyrillic characters looking similar). od is one of the earliest Unix programs, having appeared in version 1 AT&T Unix. It is also specified in the POSIX standards.
In addition to the standard format specifiers, %b causes the command to expand backslash escape sequences (for example \n for newline), and %q outputs an item that can be used as shell input. [3] The format string is reused if there are more items than format specs. Unused format specs provide a zero value or null string.
On Linux systems, the command hexcat produces this classic output format, too. The main reason for the design of this format is that it fits the maximum amount of data on a standard 80-character-wide screen or printer, while still being very easy to read and skim visually.
Change the file ownership PDP-7 UNIX cksum: Filesystem Mandatory Write file checksums and sizes 4.4BSD cmp: Filesystem Mandatory Compare two files; see also diff Version 1 AT&T UNIX comm: Text processing Mandatory Select or reject lines common to two files Version 4 AT&T UNIX command: Shell programming Mandatory Execute a simple command ...
Yes by file Yes No No Yes Yes Extension No No ECOFF: Ultrix, Tru64 UNIX, IRIX: none Yes by file Yes No No Yes Yes Yes No No XCOFF: IBM AIX, BeOS, "classic" Mac OS: none Yes by file Yes No No Yes Yes [9] Yes No No SOM: HP-UX, MPE/ix? Unknown Unknown No No Unknown Yes No Unknown No Amiga Hunk: AmigaOS: none No Yes Yes No No Yes No Yes No ...
The command tells only what the file looks like, not what it is (in the case where file looks at the content). It is easy to fool the program by putting a magic number into a file the content of which does not match it. Thus the command is not usable as a security tool other than in specific situations.
CUPS provides both the System V and Berkeley printing commands, so users can continue with traditional commands for printing via CUPS. CUPS uses port 631 (TCP and UDP), which is the standard IPP port, and optionally on port 515 by inetd , launchd , the Solaris Service Management Facility , or xinetd which use the cups-lpd helper program to ...
In computing, format is a command-line utility that carries out disk formatting. It is a component of various operating systems , including 86-DOS , MS-DOS , IBM PC DOS and OS/2 , Microsoft Windows and ReactOS .