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diff --git a/man1p/comm.1p b/man1p/comm.1p new file mode 100644 index 000000000..77848a4da --- /dev/null +++ b/man1p/comm.1p @@ -0,0 +1,252 @@ +.\" Copyright (c) 2001-2003 The Open Group, All Rights Reserved +.TH "COMM" P 2003 "IEEE/The Open Group" "POSIX Programmer's Manual" +.\" comm +.SH NAME +comm \- select or reject lines common to two files +.SH SYNOPSIS +.LP +\fBcomm\fP \fB[\fP\fB-123\fP\fB]\fP \fIfile1 file2\fP +.SH DESCRIPTION +.LP +The \fIcomm\fP utility shall read \fIfile1\fP and \fIfile2\fP, which +should be ordered in the current collating sequence, and +produce three text columns as output: lines only in \fIfile1\fP, lines +only in \fIfile2\fP, and lines in both files. +.LP +If the lines in both files are not ordered according to the collating +sequence of the current locale, the results are +unspecified. +.SH OPTIONS +.LP +The \fIcomm\fP utility shall conform to the Base Definitions volume +of IEEE\ Std\ 1003.1-2001, Section 12.2, Utility Syntax Guidelines. +.LP +The following options shall be supported: +.TP 7 +\fB-1\fP +Suppress the output column of lines unique to \fIfile1\fP. +.TP 7 +\fB-2\fP +Suppress the output column of lines unique to \fIfile2\fP. +.TP 7 +\fB-3\fP +Suppress the output column of lines duplicated in \fIfile1\fP and +\fIfile2\fP. +.sp +.SH OPERANDS +.LP +The following operands shall be supported: +.TP 7 +\fIfile1\fP +A pathname of the first file to be compared. If \fIfile1\fP is \fB'-'\fP +, the standard input shall be used. +.TP 7 +\fIfile2\fP +A pathname of the second file to be compared. If \fIfile2\fP is \fB'-'\fP +, the standard input shall be used. +.sp +.LP +If both \fIfile1\fP and \fIfile2\fP refer to standard input or to +the same FIFO special, block special, or character special +file, the results are undefined. +.SH STDIN +.LP +The standard input shall be used only if one of the \fIfile1\fP or +\fIfile2\fP operands refers to standard input. See the +INPUT FILES section. +.SH INPUT FILES +.LP +The input files shall be text files. +.SH ENVIRONMENT VARIABLES +.LP +The following environment variables shall affect the execution of +\fIcomm\fP: +.TP 7 +\fILANG\fP +Provide a default value for the internationalization 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 categories.) +.TP 7 +\fILC_ALL\fP +If set to a non-empty string value, override the values of all the +other internationalization variables. +.TP 7 +\fILC_COLLATE\fP +.sp +Determine the locale for the collating sequence \fIcomm\fP expects +to have been used when the input files were sorted. +.TP 7 +\fILC_CTYPE\fP +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). +.TP 7 +\fILC_MESSAGES\fP +Determine the locale that should be used to affect the format and +contents of diagnostic messages written to standard +error. +.TP 7 +\fINLSPATH\fP +Determine the location of message catalogs for the processing of \fILC_MESSAGES +\&.\fP +.sp +.SH ASYNCHRONOUS EVENTS +.LP +Default. +.SH STDOUT +.LP +The \fIcomm\fP utility shall produce output depending on the options +selected. If the \fB-1\fP, \fB-2\fP, and \fB-3\fP +options are all selected, \fIcomm\fP shall write nothing to standard +output. +.LP +If the \fB-1\fP option is not selected, lines contained only in \fIfile1\fP +shall be written using the format: +.sp +.RS +.nf + +\fB"%s\\n", <\fP\fIline in file1\fP\fB> +\fP +.fi +.RE +.LP +If the \fB-2\fP option is not selected, lines contained only in \fIfile2\fP +are written using the format: +.sp +.RS +.nf + +\fB"%s%s\\n", <\fP\fIlead\fP\fB>, <\fP\fIline in file2\fP\fB> +\fP +.fi +.RE +.LP +where the string <\fIlead\fP> is as follows: +.TP 7 +<tab> +The \fB-1\fP option is not selected. +.TP 7 +null\ string +The \fB-1\fP option is selected. +.sp +.LP +If the \fB-3\fP option is not selected, lines contained in both files +shall be written using the format: +.sp +.RS +.nf + +\fB"%s%s\\n", <\fP\fIlead\fP\fB>, <\fP\fIline in both\fP\fB> +\fP +.fi +.RE +.LP +where the string <\fIlead\fP> is as follows: +.TP 7 +<tab><tab> +Neither the \fB-1\fP nor the \fB-2\fP option is selected. +.TP 7 +<tab> +Exactly one of the \fB-1\fP and \fB-2\fP options is selected. +.TP 7 +null\ string +Both the \fB-1\fP and \fB-2\fP options are selected. +.sp +.LP +If the input files were ordered according to the collating sequence +of the current locale, the lines written shall be in the +collating sequence of the original lines. +.SH STDERR +.LP +The standard error shall be used only for diagnostic messages. +.SH OUTPUT FILES +.LP +None. +.SH EXTENDED DESCRIPTION +.LP +None. +.SH EXIT STATUS +.LP +The following exit values shall be returned: +.TP 7 +\ 0 +All input files were successfully output as specified. +.TP 7 +>0 +An error occurred. +.sp +.SH CONSEQUENCES OF ERRORS +.LP +Default. +.LP +\fIThe following sections are informative.\fP +.SH APPLICATION USAGE +.LP +If the input files are not properly presorted, the output of \fIcomm\fP +might not be useful. +.SH EXAMPLES +.LP +If a file named \fBxcu\fP contains a sorted list of the utilities +in this volume of IEEE\ Std\ 1003.1-2001, a file +named \fBxpg3\fP contains a sorted list of the utilities specified +in the X/Open Portability Guide, Issue 3, and a file named +\fBsvid89\fP contains a sorted list of the utilities in the System +V Interface Definition Third Edition: +.sp +.RS +.nf + +\fBcomm -23 xcu xpg3 | comm -23 - svid89 +\fP +.fi +.RE +.LP +would print a list of utilities in this volume of IEEE\ Std\ 1003.1-2001 +not specified by either of the other +documents: +.sp +.RS +.nf + +\fBcomm -12 xcu xpg3 | comm -12 - svid89 +\fP +.fi +.RE +.LP +would print a list of utilities specified by all three documents, +and: +.sp +.RS +.nf + +\fBcomm -12 xpg3 svid89 | comm -23 - xcu +\fP +.fi +.RE +.LP +would print a list of utilities specified by both XPG3 and the SVID, +but not specified in this volume of +IEEE\ Std\ 1003.1-2001. +.SH RATIONALE +.LP +None. +.SH FUTURE DIRECTIONS +.LP +None. +.SH SEE ALSO +.LP +\fIcmp\fP , \fIdiff\fP , \fIsort\fP , \fIuniq\fP +.SH COPYRIGHT +Portions of this text are reprinted and reproduced in electronic form +from IEEE Std 1003.1, 2003 Edition, Standard for Information Technology +-- Portable Operating System Interface (POSIX), The Open Group Base +Specifications Issue 6, Copyright (C) 2001-2003 by the Institute 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.opengroup.org/unix/online.html . |