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| <tr><td width=20><td><b>GREP(1)</b><td align=right><b>GREP(1)</b> |
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| <p><font size=+1><b>NAME </b></font><br> |
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| grep, g – search a file for a pattern<br> |
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| <p><font size=+1><b>SYNOPSIS </b></font><br> |
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| <tt><font size=+1>grep</font></tt> [ <i>option ...</i> ] <i>pattern</i> [ <i>file ...</i> ] |
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| <tt><font size=+1>g</font></tt> [ <i>option ...</i> ] <i>pattern</i> [ <i>file ...</i> ]<br> |
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| <p><font size=+1><b>DESCRIPTION </b></font><br> |
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| <i>Grep</i> searches the input <i>files</i> (standard input default) for lines |
| that match the <i>pattern</i>, a regular expression as defined in <a href="../man7/regexp.html"><i>regexp</i>(7)</a> |
| with the addition of a newline character as an alternative (substitute |
| for <tt><font size=+1>|</font></tt>) with lowest precedence. Normally, each line matching the |
| pattern is ‘selected’, and each selected line is copied to |
| the standard output. The options are<br> |
| <tt><font size=+1>−c</font></tt> Print only a count of matching lines.<br> |
| <tt><font size=+1>−h</font></tt> Do not print file name tags (headers) with output lines.<br> |
| <tt><font size=+1>−e</font></tt> The following argument is taken as a <i>pattern</i>. This option makes |
| it easy to specify patterns that might confuse argument parsing, |
| such as <tt><font size=+1>−n</font></tt>.<br> |
| <tt><font size=+1>−i</font></tt> Ignore alphabetic case distinctions. The implementation folds |
| into lower case all letters in the pattern and input before interpretation. |
| Matched lines are printed in their original form.<br> |
| <tt><font size=+1>−l</font></tt> (ell) Print the names of files with selected lines; don’t print |
| the lines.<br> |
| <tt><font size=+1>−L</font></tt> Print the names of files with no selected lines; the converse |
| of <tt><font size=+1>−l</font></tt>.<br> |
| <tt><font size=+1>−n</font></tt> Mark each printed line with its line number counted in its file.<br> |
| <tt><font size=+1>−s</font></tt> Produce no output, but return status.<br> |
| <tt><font size=+1>−v</font></tt> Reverse: print lines that do not match the pattern.<br> |
| <tt><font size=+1>−f</font></tt> The pattern argument is the name of a file containing regular |
| expressions one per line.<br> |
| <tt><font size=+1>−b</font></tt> Don’t buffer the output: write each output line as soon as it |
| is discovered. |
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| Output lines are tagged by file name when there is more than one |
| input file. (To force this tagging, include <tt><font size=+1>/dev/null</font></tt> as a file |
| name argument.) |
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| Care should be taken when using the shell metacharacters <tt><font size=+1>$*[^|()=\</font></tt> |
| and newline in <i>pattern</i>; it is safest to enclose the entire expression |
| in single quotes <tt><font size=+1>'</font></tt>...<tt><font size=+1>'</font></tt>. An expression starting with ’*’ will treat |
| the rest of the expression as literal characters. |
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| <i>G</i> invokes grep with <tt><font size=+1>−n</font></tt> and forces tagging of output lines by file |
| name. If no files are listed, it searches all files matching<br> |
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| <tt><font size=+1>*.C *.b *.c *.h *.m *.cc *.java *.py *.tex *.ms<br> |
| </font></tt> |
| </table> |
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| </table> |
| <p><font size=+1><b>SOURCE </b></font><br> |
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| <tt><font size=+1>/usr/local/plan9/src/cmd/grep<br> |
| /usr/local/plan9/bin/g<br> |
| </font></tt> |
| </table> |
| <p><font size=+1><b>SEE ALSO </b></font><br> |
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| <a href="../man1/ed.html"><i>ed</i>(1)</a>, <a href="../man1/awk.html"><i>awk</i>(1)</a>, <a href="../man1/sed.html"><i>sed</i>(1)</a>, <a href="../man1/sam.html"><i>sam</i>(1)</a>, <a href="../man7/regexp.html"><i>regexp</i>(7)</a><br> |
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| </table> |
| <p><font size=+1><b>DIAGNOSTICS </b></font><br> |
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| Exit status is null if any lines are selected, or non-null when |
| no lines are selected or an error occurs.<br> |
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