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All Rights Reserved. 46 .\" 47 .TH CMP 1 "Jul 19, 2006" 48 .SH NAME 49 cmp \- compare two files 50 .SH SYNOPSIS 51 .LP 52 .nf 53 \fBcmp\fR [\fB-l\fR | \fB-s\fR] \fIfile1\fR \fIfile2\fR [\fIskip1\fR] [\fIskip2\fR] 54 .fi 55 56 .SH DESCRIPTION 57 .sp 58 .LP 59 The \fBcmp\fR utility compares two files. \fBcmp\fR writes no output if the 60 files are the same. Under default options, if they differ, it writes to 61 standard output the byte and line numbers at which the first difference 62 occurred. Bytes and lines are numbered beginning with 1. If one file is an 63 initial subsequence of the other, that fact is noted. \fIskip1\fR and 64 \fIskip2\fR are initial byte offsets into \fIfile1\fR and \fIfile2\fR 65 respectively, and can be either octal or decimal. A leading 0 denotes octal. 66 .SH OPTIONS 67 .sp 68 .LP 69 The following options are supported: 70 .sp 71 .ne 2 72 .na 73 \fB\fB-l\fR\fR 74 .ad 75 .RS 6n 76 Write the byte number (decimal) and the differing bytes (octal) for each 77 difference. 78 .RE 79 80 .sp 81 .ne 2 82 .na 83 \fB\fB-s\fR\fR 84 .ad 85 .RS 6n 86 Write nothing for differing files. Return exit status only. 87 .RE 88 89 .SH OPERANDS 90 .sp 91 .LP 92 The following operands are supported: 93 .sp 94 .ne 2 95 .na 96 \fB\fIfile1\fR\fR 97 .ad 98 .RS 9n 99 A path name of the first file to be compared. If \fIfile1\fR is \fB\(mi\fR, the 100 standard input is used. 101 .RE 102 103 .sp 104 .ne 2 105 .na 106 \fB\fIfile2\fR\fR 107 .ad 108 .RS 9n 109 A path name of the second file to be compared. If \fIfile2\fR is \fB\(mi\fR, 110 the standard input is used. 111 .RE 112 113 .sp 114 .LP 115 If both \fIfile1\fR and \fIfile2\fR refer to standard input or refer to the 116 same \fBFIFO\fR special, block special or character special file, an error 117 results. 118 .SH USAGE 119 .sp 120 .LP 121 See \fBlargefile\fR(5) for the description of the behavior of \fBcmp\fR when 122 encountering files greater than or equal to 2 Gbyte (2^31 bytes). 123 .SH EXAMPLES 124 .LP 125 \fBExample 1 \fRComparing Files Byte for Byte 126 .sp 127 .LP 128 The following example does a byte for byte comparison of \fIfile1\fR and 129 \fIfile2\fR: 130 131 .sp 132 .in +2 133 .nf 134 example% \fBcmp file1 file2 0 1024\fR 135 .fi 136 .in -2 137 .sp 138 139 .sp 140 .LP 141 It skips the first 1024 bytes in \fIfile2\fR before starting the comparison. 142 143 .SH ENVIRONMENT VARIABLES 144 .sp 145 .LP 146 See \fBenviron\fR(5) for descriptions of the following environment variables 147 that affect the execution of \fBcmp\fR: \fBLANG\fR, \fBLC_ALL\fR, 148 \fBLC_CTYPE\fR, \fBLC_MESSAGES\fR, and \fBNLSPATH\fR. 149 .SH EXIT STATUS 150 .sp 151 .LP 152 The following error values are returned: 153 .sp 154 .ne 2 155 .na 156 \fB\fB0\fR\fR 157 .ad 158 .RS 6n 159 The files are identical. 160 .RE 161 162 .sp 163 .ne 2 164 .na 165 \fB\fB1\fR\fR 166 .ad 167 .RS 6n 168 The files are different. This includes the case where one file is identical to 169 the first part of the other. 170 .RE 171 172 .sp 173 .ne 2 174 .na 175 \fB\fB>1\fR\fR 176 .ad 177 .RS 6n 178 An error occurred. 179 .RE 180 181 .SH ATTRIBUTES 182 .sp 183 .LP 184 See \fBattributes\fR(5) for descriptions of the following attributes: 185 .sp 186 187 .sp 188 .TS 189 box; 190 c | c 191 l | l . 192 ATTRIBUTE TYPE ATTRIBUTE VALUE 193 _ 194 CSI Enabled 195 _ 196 Interface Stability Standard 197 .TE 198 199 .SH SEE ALSO 200 .sp 201 .LP 202 \fBcomm\fR(1), \fBdiff\fR(1), \fBattributes\fR(5), \fBenviron\fR(5), 203 \fBlargefile\fR(5), \fBstandards\fR(5)