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authorIndrajith K L2022-12-03 17:00:20 +0530
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+head(P) head(P)
+
+
+
+
+
+NAME
+ head - copy the first part of files
+
+SYNOPSIS
+ head [-n number][file...]
+
+DESCRIPTION
+ The head utility shall copy its input files to the stan-
+ dard output, ending the output for each file at a desig-
+ nated point.
+
+ Copying shall end at the point in each input file indi-
+ cated by the -n number option. The option-argument num-
+ ber shall be counted in units of lines.
+
+OPTIONS
+ The head utility shall conform to the Base Definitions
+ volume of IEEE Std 1003.1-2001, Section 12.2, Utility
+ Syntax Guidelines.
+
+ The following option shall be supported:
+
+ -n number
+ The first number lines of each input file shall
+ be copied to standard output. The application
+ shall ensure that the number option-argument is a
+ positive decimal integer.
+
+
+ When a file contains less than number lines, it shall be
+ copied to standard output in its entirety. This shall
+ not be an error.
+
+ If no options are specified, head shall act as if -n 10
+ had been specified.
+
+OPERANDS
+ The following operand shall be supported:
+
+ file A pathname of an input file. If no file operands
+ are specified, the standard input shall be used.
+
+
+STDIN
+ The standard input shall be used only if no file oper-
+ ands are specified. See the INPUT FILES section.
+
+INPUT FILES
+ Input files shall be text files, but the line length is
+ not restricted to {LINE_MAX} bytes.
+
+ENVIRONMENT VARIABLES
+ The following environment variables shall affect the
+ execution of head:
+
+ LANG Provide a default value for the internationaliza-
+ tion variables that are unset or null. (See the
+ Base Definitions volume of IEEE Std 1003.1-2001,
+ Section 8.2, Internationalization Variables for
+ the precedence of internationalization variables
+ used to determine the values of locale cate-
+ gories.)
+
+ LC_ALL If set to a non-empty string value, override the
+ values of all the other internationalization
+ variables.
+
+ LC_CTYPE
+ Determine the locale for the interpretation of
+ sequences of bytes of text data as characters
+ (for example, single-byte as opposed to multi-
+ byte characters in arguments and input files).
+
+ LC_MESSAGES
+ Determine the locale that should be used to
+ affect the format and contents of diagnostic mes-
+ sages written to standard error.
+
+ NLSPATH
+ Determine the location of message catalogs for
+ the processing of LC_MESSAGES .
+
+
+ASYNCHRONOUS EVENTS
+ Default.
+
+STDOUT
+ The standard output shall contain designated portions of
+ the input files.
+
+ If multiple file operands are specified, head shall pre-
+ cede the output for each with the header:
+
+
+ "\n==> %s <==\n", <pathname>
+
+ except that the first header written shall not include
+ the initial <newline>.
+
+STDERR
+ The standard error shall be used only for diagnostic
+ messages.
+
+OUTPUT FILES
+ None.
+
+EXTENDED DESCRIPTION
+ None.
+
+EXIT STATUS
+ The following exit values shall be returned:
+
+ 0 Successful completion.
+
+ >0 An error occurred.
+
+
+CONSEQUENCES OF ERRORS
+ Default.
+
+ The following sections are informative.
+
+APPLICATION USAGE
+ The obsolescent - number form is withdrawn in this ver-
+ sion. Applications should use the -n number option.
+
+EXAMPLES
+ To write the first ten lines of all files (except those
+ with a leading period) in the directory:
+
+
+ head *
+
+RATIONALE
+ Although it is possible to simulate head with sed 10q
+ for a single file, the standard developers decided that
+ the popularity of head on historical BSD systems war-
+ ranted its inclusion alongside tail.
+
+ This standard version of head follows the Utility Syntax
+ Guidelines. The -n option was added to this new inter-
+ face so that head and tail would be more logically
+ related.
+
+ There is no -c option (as there is in tail) because it
+ is not historical practice and because other utilities
+ in this volume of IEEE Std 1003.1-2001 provide similar
+ functionality.
+
+FUTURE DIRECTIONS
+ None.
+
+SEE ALSO
+ sed , tail
+
+COPYRIGHT
+ Portions of this text are reprinted and reproduced in
+ electronic form from IEEE Std 1003.1, 2003 Edition,
+ Standard for Information Technology -- Portable Operat-
+ ing System Interface (POSIX), The Open Group Base Speci-
+ fications Issue 6, Copyright (C) 2001-2003 by the Insti-
+ tute of Electrical and Electronics Engineers, Inc and
+ The Open Group. In the event of any discrepancy between
+ this version and the original IEEE and The Open Group
+ Standard, the original IEEE and The Open Group Standard
+ is the referee document. The original Standard can be
+ obtained online at http://www.open-
+ group.org/unix/online.html .
+
+
+
+POSIX 2003 head(P)