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== GREP ==
 
== GREP ==
  grep [OPTIONS] "foo" [FILES(s)]
+
  grep [OPTIONS] "REGEXP" [FILES(s)]
  
 +
*"REGEXP" can be any [[Regular Expression]]
 
*Single or double quotes can be used.
 
*Single or double quotes can be used.
*Quotes can be omitted if there are no spaces in the search term.  
+
*Quotes can be omitted if there are no spaces in the search term.
 +
 
 
*If file is omitted, all files in current dir are searched.
 
*If file is omitted, all files in current dir are searched.
 
*Multiple files can be specified separated by spaces or wildcarded (*.txt)
 
*Multiple files can be specified separated by spaces or wildcarded (*.txt)
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  -r  recursive files inclusion
 
  -r  recursive files inclusion
  
 
+
'''egrep''' supports pipes ("or") (= grep -E)
"foo" can be any [[Regular Expression]]
+
 
+
egrep supports pipes ("or") (= grep -E)
+
  
 
  egrep "fruit|bread"  
 
  egrep "fruit|bread"  
  
fgrep (fast grep, simple text, no RegEXp) (- grep -F)
+
'''fgrep''' (fast grep, simple text, no RegEXp) (= grep -F)
  
 
Can pipe the output of another command
 
Can pipe the output of another command
  
 
  ls |grep blah lists all files in the current directory whose names contain the string "blah"
 
  ls |grep blah lists all files in the current directory whose names contain the string "blah"

Revision as of 12:44, 12 September 2015

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