Top Forums Shell Programming and Scripting How to use sed to search a particular pattern in a file backward after a pattern is matched.? Post 302834177 by saurabh kumar on Thursday 18th of July 2013 12:27:20 PM
Thank you raja and RudiC.

These solutions seems to work for most of the test-cases. Haven't had much experience with awk. Please let me know ,if I understand correctly these solutions

Raja,
In the first line you extracted the pattern from file2 and stored them in a variable var. Then in the second line for any line starting with / the whole line($0) is stored in a and then you perform a match with pat($0~pat) and print a .Can you please explain how does matching $0 with pat works because $0 will contain the path and pat will contain the pattern(1172c1172).

RudyC,
Can you please explain your solution .Will this solution work if file2 has more than one entry
Code:
2388,2391d2387 < 1172c1172 < <          apple, banana, orange < --- < >          apple, banana, mango
1277,1280d1276 < 117c117 < <   	silent, helpful < --- < >  	silent

 
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XZDIFF(1)							     XZ Utils								 XZDIFF(1)

NAME
xzcmp, xzdiff, lzcmp, lzdiff - compare compressed files SYNOPSIS
xzcmp [cmp_options] file1 [file2] xzdiff [diff_options] file1 [file2] lzcmp [cmp_options] file1 [file2] lzdiff [diff_options] file1 [file2] DESCRIPTION
xzcmp and xzdiff invoke cmp(1) or diff(1) on files compressed with xz(1), lzma(1), gzip(1), bzip2(1), or lzop(1). All options specified are passed directly to cmp(1) or diff(1). If only one file is specified, then the files compared are file1 (which must have a suffix of a supported compression format) and file1 from which the compression format suffix has been stripped. If two files are specified, then they are uncompressed if necessary and fed to cmp(1) or diff(1). The exit status from cmp(1) or diff(1) is preserved. The names lzcmp and lzdiff are provided for backward compatibility with LZMA Utils. SEE ALSO
cmp(1), diff(1), xz(1), gzip(1), bzip2(1), lzop(1), zdiff(1) BUGS
Messages from the cmp(1) or diff(1) programs refer to temporary filenames instead of those specified. Tukaani 2011-03-19 XZDIFF(1)

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