Comments on: HowTo: Read a File Line By Line Using awk http://www.cyberciti.biz/faq/read-a-file-line-by-line-using-awk/ Every answer asks a more beautiful question. Fri, 10 Feb 2012 19:55:56 +0000 hourly 1 http://wordpress.org/?v=3.3.1 By: Ed Dagoshttp://www.cyberciti.biz/faq/read-a-file-line-by-line-using-awk/#comment-63113 Ed Dagos Mon, 03 Oct 2011 20:48:11 +0000 http://www.cyberciti.biz/faq/read-a-file-line-by-line-using-awk/#comment-63113 Thanks Vivek for your response. However, on Sun OS 5.10 Options -B and -A do not work. Would you mind to tell me what environment have you tested it. Regards, Ed Thanks Vivek for your response. However, on Sun OS 5.10 Options -B and -A do not work. Would you mind to tell me what environment have you tested it.
Regards,
Ed

]]> By: Vivek Gitehttp://www.cyberciti.biz/faq/read-a-file-line-by-line-using-awk/#comment-63053 Vivek Gite Sat, 01 Oct 2011 20:21:01 +0000 http://www.cyberciti.biz/faq/read-a-file-line-by-line-using-awk/#comment-63053 Search for "foo" in data.txt and display 3 lines of leading context <strong>before</strong> matching line: <pre>grep -B3 "foo" data.txt</pre> The -A options display $NUM lines of trailing context <strong>after</strong> matching lines: <pre>grep -A3 "foo" data.txt</pre> Search for “foo” in data.txt and display 3 lines of leading context before matching line:

grep -B3 "foo" data.txt

The -A options display $NUM lines of trailing context after matching lines:

grep -A3 "foo" data.txt
]]> By: Truptihttp://www.cyberciti.biz/faq/read-a-file-line-by-line-using-awk/#comment-63052 Trupti Sat, 01 Oct 2011 17:46:50 +0000 http://www.cyberciti.biz/faq/read-a-file-line-by-line-using-awk/#comment-63052 Exactl, even I wanted to know the same. If anyone could help me with this. :) Ed Dagos September 16, 2011 Hi All, Is it possible to find a pattern in the file and then print the previous 3 or 4 lines using awk/sed/grep ?? Regards, Exactl, even I wanted to know the same. If anyone could help me with this. :)

Ed Dagos September 16, 2011

Hi All,
Is it possible to find a pattern in the file and then print the previous 3 or 4 lines using awk/sed/grep ??
Regards,

]]> By: Ed Dagoshttp://www.cyberciti.biz/faq/read-a-file-line-by-line-using-awk/#comment-62464 Ed Dagos Fri, 16 Sep 2011 01:26:25 +0000 http://www.cyberciti.biz/faq/read-a-file-line-by-line-using-awk/#comment-62464 Hi All, Is it possible to find a pattern in the file and then print the previous 3 or 4 lines using awk/sed/grep ?? Regards, Ed Hi All,
Is it possible to find a pattern in the file and then print the previous 3 or 4 lines using awk/sed/grep ??
Regards,
Ed

]]> By: varpalhttp://www.cyberciti.biz/faq/read-a-file-line-by-line-using-awk/#comment-49772 varpal Tue, 28 Sep 2010 10:35:10 +0000 http://www.cyberciti.biz/faq/read-a-file-line-by-line-using-awk/#comment-49772 Can I compare two column in AWK Can I compare two column in AWK

]]> By: andrehttp://www.cyberciti.biz/faq/read-a-file-line-by-line-using-awk/#comment-45633 andre Tue, 19 Jan 2010 22:33:06 +0000 http://www.cyberciti.biz/faq/read-a-file-line-by-line-using-awk/#comment-45633 Hi great article. One suggestion is that the file names in the awk scripts can be substituted for the standard input. e.g. to get the number of lines in a file you could use wc -l filename | awk '{ print $1 }' Andre Hi great article. One suggestion is that the file names in the awk scripts can be substituted for the standard input.

e.g. to get the number of lines in a file you could use

wc -l filename | awk ‘{ print $1 }’

Andre

]]> By: sundarhttp://www.cyberciti.biz/faq/read-a-file-line-by-line-using-awk/#comment-42250 sundar Fri, 26 Jun 2009 02:34:48 +0000 http://www.cyberciti.biz/faq/read-a-file-line-by-line-using-awk/#comment-42250 That's a good tip! By the way, how to read a file, compare a field value then <b>insert </b>record in between using awk? Can you help? Thanks. :-) That’s a good tip! By the way, how to read a file, compare a field value then insert record in between using awk? Can you help? Thanks. :-)

]]> By: TrueColorTechhttp://www.cyberciti.biz/faq/read-a-file-line-by-line-using-awk/#comment-41866 TrueColorTech Mon, 01 Jun 2009 16:08:53 +0000 http://www.cyberciti.biz/faq/read-a-file-line-by-line-using-awk/#comment-41866 Thanks for the tip, made things much easier. Thanks for the tip, made things much easier.

]]> By: codeguruhttp://www.cyberciti.biz/faq/read-a-file-line-by-line-using-awk/#comment-40492 codeguru Thu, 26 Feb 2009 06:46:49 +0000 http://www.cyberciti.biz/faq/read-a-file-line-by-line-using-awk/#comment-40492 That was pretty cool. Had problems understanding awk. The tip really enlightened me. Thanks That was pretty cool. Had problems understanding awk. The tip really enlightened me. Thanks

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