How to get lines with only one occurence of pattern?

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Pattern occurence in a file

How can we find the number of occurence of a specified pattern in a file? This command would be a part of a shell script.

LEARN ABOUT DEBIAN

plan9-grep

GREP(1) 						      General Commands Manual							   GREP(1)

NAME

       grep, g - search a file for a pattern

SYNOPSIS

       grep [ option ...  ] pattern [ file ...	]

       g [ option ...  ] pattern [ file ...  ]

DESCRIPTION

       Grep  searches the input files (standard input default) for lines that match the pattern, a regular expression as defined in regexp(7) with
       the addition of a newline character as an alternative (substitute for |) with lowest precedence.  Normally, each line matching the  pattern
       is `selected', and each selected line is copied to the standard output.	The options are

       -c     Print only a count of matching lines.
       -h     Do not print file name tags (headers) with output lines.
       -e     The  following  argument	is taken as a pattern.	This option makes it easy to specify patterns that might confuse argument parsing,
	      such as -n.
       -i     Ignore alphabetic case distinctions.  The implementation folds into lower case all letters in the pattern and input before interpre-
	      tation.  Matched lines are printed in their original form.
       -l     (ell) Print the names of files with selected lines; don't print the lines.
       -L     Print the names of files with no selected lines; the converse of -l.
       -n     Mark each printed line with its line number counted in its file.
       -s     Produce no output, but return status.
       -v     Reverse: print lines that do not match the pattern.
       -f     The pattern argument is the name of a file containing regular expressions one per line.
       -b     Don't buffer the output: write each output line as soon as it is discovered.

       Output  lines  are  tagged  by  file name when there is more than one input file.  (To force this tagging, include /dev/null as a file name
       argument.)

       Care should be taken when using the shell metacharacters $*[^|()= and newline in pattern; it is safest to enclose the entire expression in
       single quotes '...'.  An expression starting with '*' will treat the rest of the expression as literal characters.

       G invokes grep with -n and forces tagging of output lines by file name.	If no files are listed, it searches all files matching

	      *.C *.b *.c *.h *.m *.cc *.java *.cgi *.pl *.py *.tex *.ms

SOURCE

       /src/cmd/grep
       /bin/g

SEE ALSO

       ed(1), awk(1), sed(1), sam(1), regexp(7)

DIAGNOSTICS

       Exit status is null if any lines are selected, or non-null when no lines are selected or an error occurs.

																	   GREP(1)

Shell Programming and Scripting