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[https://en.wikipedia.org/wiki/Filesystem_Hierarchy_Standard Standard directory naming]

== GREP ==
 grep [OPTIONS] "REGEXP" [FILES(s)]

*"REGEXP" can be any [[Regular Expression]]
*Single or double quotes can be used.
*Quotes can be omitted if there are no spaces in the search term.
  
*If file is omitted, all files in current dir are searched.
*Multiple files can be specified separated by spaces or wildcarded (*.txt)
*''While most tutorials assume that you are going to specify a file to search, using the search feature in vi makes more sense for working with a single file.''

 OPTIONS:
 -i  ignore case
 -n  print line #s
 -l  just show filenames
 -x  exact matches only
 -w  match whole words only
 -m, --max-count=NUM       stop after NUM matches
 -a  text files only
 -r  recursive files inclusion

'''egrep''' supports pipes ("or") (= grep -E)

 egrep "fruit|bread" 

'''fgrep''' (fast grep, simple text, no RegEXp) (= grep -F)

Can pipe the output of another command

 ls |grep blah lists all files in the current directory whose names contain the string "blah"