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Grep -C option not available

 
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# 1  
Old 12-04-2014
Grep -C option not available
grep -C option is not availbale and i am using korn shell.

Even -C option in man grep is not showing..

Input file : test.txt
Code:
111
333
444
555
aaa
bbbb

Command :
Code:
grep -C1 555 test.txt

Required output:
Code:
444
555
aaa

Please tell the alternative approach to get the result?

Thanks..
# 2  
Old 12-04-2014
grep's -C option, when available, is a combination of -A and -B, so the alternative is
Code:
grep -A1 -B1 555 test.txt

This User Gave Thanks to junior-helper For This Post:
rbatte1
# 3  
Old 12-04-2014
Try:
Code:
awk -v s=555 '$0~s{if(p x)print p; print; c=1; p=x; next} {p=$0} c-->0{print; p=x}' file


---
On Solaris use /usr/xpg4/bin/awk rather than awk


--
Quote:
Originally Posted by junior-helper
grep's -C option, when available, is a combination of -A and -B, so the alternative is
Code:
grep -A1 -B1 555 test.txt

The -C option works with GNU Grep and recent BSD grep.. If the -C option is not available, then -B and -A aren't either, so it is not an alternative really....
Last edited by Scrutinizer; 12-04-2014 at 04:09 PM..
# 4  
Old 12-04-2014
-C is (iirc) a GNU-grep option. What's your OS?
# 5  
Old 12-04-2014
Hi.

Possibilities:
Code:
Print lines above, below pattern-matched line (context, window); "only" string matching pattern
	1) GNU grep -A -B; ggrep on some Solaris

	2) peg, a perl script, does not use "-o" like GNU grep;
	allows -A, -B

	3) ack, a perl script, can use "-o" like GNU grep; allows -A,
	-B

	4) cgrep does not use "-o" like GNU grep; allows -nline,
	+nline for context like GNU grep -A, -B

	5) bool, prints context in bytes

	6) xtcgrep, extension of CPAN grep; allow -C context; allows -o;
	complicated calling sequence; http://freecode.com/projects/greppm

Best wishes ... cheers, drl
# 6  
Old 12-04-2014
egrep -C 1 you can emulate with awk:
Code:
awk '$0~s {if (bb) {print b; bb=0}; print; if (getline) print; next} {b=$0; bb=1}' s="555" test.txt

(In Solaris, you need nawk or /usr/xpg4/bin/awk)
# 7  
Old 12-04-2014
@MadeinGermany: That won't work for two consecutive lines with the pattern. Then the line after will not be printed..
This User Gave Thanks to Scrutinizer For This Post:
MadeInGermany
 
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