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  12 .TH EGREP 1 "Nov 28, 2017"
  13 .SH NAME
  14 egrep \- search a file for a pattern using full regular expressions
  15 .SH SYNOPSIS
  16 .LP
  17 .nf
  18 \fB/usr/bin/egrep\fR [\fB-bcHhilnqsvx\fR] \fB-e\fR \fIpattern_list\fR [\fB-f\fR \fIfile\fR]
  19      [\fIfile...\fR]
  20 .fi
  21 
  22 .LP
  23 .nf
  24 \fB/usr/bin/egrep\fR [\fB-bcHhilnqsvx\fR] [\fB-e\fR \fIpattern_list\fR] \fB-f\fR \fIfile\fR
  25      [\fIfile...\fR]
  26 .fi
  27 
  28 .LP
  29 .nf
  30 \fB/usr/bin/egrep\fR [\fB-bcHhilnqsvx\fR] \fIpattern\fR [\fIfile...\fR]
  31 .fi
  32 
  33 .SH DESCRIPTION
  34 .LP
  35 The \fBegrep\fR (\fIexpression grep\fR) utility searches files for a pattern of
  36 characters and prints all lines that contain that pattern. \fBegrep\fR uses
  37 full regular expressions (expressions that have string values that use the full
  38 set of alphanumeric and special characters) to match the patterns. It uses a
  39 fast deterministic algorithm that sometimes needs exponential space.
  40 .sp
  41 .LP
  42 If no files are specified, \fBegrep\fR assumes standard input. Normally, each
  43 line found is copied to the standard output. The file name is printed before
  44 each line found if there is more than one input file.
  45 .LP
  46 The \fBegrep\fR utility accepts the same form of full regular expressions as
  47 \fBgrep\fR(1) -E option.
  48 .sp
  49 .LP
  50 Be careful using the characters \fB$\fR, \fB*\fR, \fB[\fR, \fB^\fR, |, \fB(\fR,
  51 \fB)\fR, and \fB\e\fR in \fIfull regular expression\fR, because they are also
  52 meaningful to the shell. It is safest to enclose the entire \fIfull regular
  53 expression\fR in single quotes (\fBa\'\fR\fBa\'\fR).
  54 .sp
  55 .LP
  56 The order of precedence of operators is \fB[\|]\fR, then \fB*\|?\|+\fR, then
  57 concatenation, then | and NEWLINE.
  58 .SH OPTIONS
  59 .LP
  60 The following options are supported:
  61 .sp
  62 .ne 2
  63 .na
  64 \fB\fB-b\fR\fR
  65 .ad
  66 .RS 6n
  67 Precede each line by the block number on which it was found. This can be useful
  68 in locating block numbers by context (first block is 0).
  69 .RE
  70 
  71 .sp
  72 .ne 2
  73 .na
  74 \fB\fB-c\fR\fR
  75 .ad
  76 .RS 6n
  77 Print only a count of the lines that contain the pattern.
  78 .RE
  79 
  80 .sp
  81 .ne 2
  82 .na
  83 \fB\fB-e\fR \fIpattern_list\fR\fR
  84 .ad
  85 .RS 6n
  86 Search for a \fIpattern_list\fR (\fIfull regular expression\fR that begins with
  87 a \fB\(mi\fR).
  88 .RE
  89 
  90 .sp
  91 .ne 2
  92 .na
  93 \fB\fB-f\fR \fIfile\fR\fR
  94 .ad
  95 .RS 6n
  96 Take the list of \fIfull\fR \fIregular\fR \fIexpressions\fR from \fIfile\fR.
  97 .RE
  98 
  99 .sp
 100 .ne 2
 101 .na
 102 \fB\fB-H\fR\fR
 103 .ad
 104 .RS 6n
 105 Precedes each line by the name of the file containing the matching line.
 106 .RE
 107 
 108 .sp
 109 .ne 2
 110 .na
 111 \fB\fB-h\fR\fR
 112 .ad
 113 .RS 6n
 114 Suppress printing of filenames when searching multiple files.
 115 .RE
 116 
 117 .sp
 118 .ne 2
 119 .na
 120 \fB\fB-i\fR\fR
 121 .ad
 122 .RS 6n
 123 Ignore upper/lower case distinction during comparisons.
 124 .RE
 125 
 126 .sp
 127 .ne 2
 128 .na
 129 \fB\fB-l\fR\fR
 130 .ad
 131 .RS 6n
 132 Print the names of files with matching lines once, separated by NEWLINEs. Does
 133 not repeat the names of files when the pattern is found more than once.
 134 .RE
 135 
 136 .sp
 137 .ne 2
 138 .na
 139 \fB\fB-n\fR\fR
 140 .ad
 141 .RS 6n
 142 Precede each line by its line number in the file (first line is 1).
 143 .RE
 144 
 145 .sp
 146 .ne 2
 147 .na
 148 \fB\fB-q\fR\fR
 149 .ad
 150 .RS 6n
 151 Quiet. Does not write anything to the standard output, regardless of matching
 152 lines. Exits with zero status if an input line is selected.
 153 .RE
 154 
 155 .sp
 156 .ne 2
 157 .na
 158 \fB\fB-s\fR\fR
 159 .ad
 160 .RS 6n
 161 Legacy equivalent of \fB-q\fR.
 162 .RE
 163 
 164 .sp
 165 .ne 2
 166 .na
 167 \fB\fB-v\fR\fR
 168 .ad
 169 .RS 6n
 170 Print all lines except those that contain the pattern.
 171 .RE
 172 
 173 .sp
 174 .ne 2
 175 .na
 176 \fB\fB-x\fR\fR
 177 .ad
 178 .RS 6n
 179 Consider only input lines that use all characters in the line to match an
 180 entire fixed string or regular expression to be matching lines.
 181 .RE
 182 
 183 .SH OPERANDS
 184 .LP
 185 The following operands are supported:
 186 .sp
 187 .ne 2
 188 .na
 189 \fB\fIfile\fR\fR
 190 .ad
 191 .RS 8n
 192 A path name of a file to be searched for the patterns. If no \fIfile\fR
 193 operands are specified, the standard input is used.
 194 .RE
 195 
 196 .ne 2
 197 .na
 198 \fB\fIpattern\fR\fR
 199 .ad
 200 .RS 8n
 201 Specify one or more patterns to be used during the search for input. This
 202 operand is treated as if it were specified as \fB-e\fR\fIpattern_list\fR.
 203 .RE
 204 
 205 .SH USAGE
 206 .LP
 207 See \fBlargefile\fR(5) for the description of the behavior of \fBegrep\fR when
 208 encountering files greater than or equal to 2 Gbyte ( 2^31 bytes).
 209 .SH ENVIRONMENT VARIABLES
 210 .LP
 211 See \fBenviron\fR(5) for descriptions of the following environment variables
 212 that affect the execution of \fBegrep\fR: \fBLC_COLLATE\fR, \fBLC_CTYPE\fR,
 213 \fBLC_MESSAGES\fR, and \fBNLSPATH\fR.
 214 .SH EXIT STATUS
 215 .LP
 216 The following exit values are returned:
 217 .sp
 218 .ne 2
 219 .na
 220 \fB\fB0\fR\fR
 221 .ad
 222 .RS 5n
 223 If any matches are found.
 224 .RE
 225 
 226 .sp
 227 .ne 2
 228 .na
 229 \fB\fB1\fR\fR
 230 .ad
 231 .RS 5n
 232 If no matches are found.
 233 .RE
 234 
 235 .sp
 236 .ne 2
 237 .na
 238 \fB\fB2\fR\fR
 239 .ad
 240 .RS 5n
 241 For syntax errors or inaccessible files (even if matches were found).
 242 .RE
 243 
 244 .SH ATTRIBUTES
 245 .LP
 246 See \fBattributes\fR(5) for descriptions of the following attributes:
 247 
 248 .sp
 249 .TS
 250 box;
 251 c | c
 252 l | l .
 253 ATTRIBUTE TYPE  ATTRIBUTE VALUE
 254 _
 255 CSI     Enabled
 256 .TE
 257 
 258 .SH SEE ALSO
 259 .LP
 260 \fBfgrep\fR(1), \fBgrep\fR(1), \fBsed\fR(1), \fBsh\fR(1), \fBattributes\fR(5),
 261 \fBenviron\fR(5), \fBlargefile\fR(5), \fBregex\fR(5), \fBregexp\fR(5),
 262 \fBXPG4\fR(5)
 263 .SH NOTES
 264 .LP
 265 Ideally there should be only one \fBgrep\fR command, but there is not a single
 266 algorithm that spans a wide enough range of space-time trade-offs.
 267 .sp
 268 .LP
 269 Lines are limited only by the size of the available virtual memory.
 270 .LP
 271 The \fB/usr/bin/egrep\fR utility is identical to \fB/usr/bin/grep\fR
 272 \fB-E\fR. See \fBgrep\fR(1). Portable applications should use
 273 \fB/usr/bin/grep\fR \fB-E\fR.
 274 .LP
 275 In the past the behavior of \fB/usr/xpg4/bin/egrep\fR and
 276 \fB/usr/bin/egrep\fR utilities was different. Now \fB/usr/bin/egrep\fR
 277 is replaced by \fB/usr/xpg4/bin/egrep\fR.