07-31-2008
search for the matched pattern by tracing back from the line
Hi,
I want to grep the line which has 'data11'.then from that line, i need to trace back and find out the immediate line which has the same timestamp of that grepped line.
for eg:
log file:
-----------
[22/Jan/2008:19:37:00-20401-59-2] Process - data
[22/Jan/2008:19:37:00-20401-59-2] Process - datavalue - 2345
[22/Mar/2008:19:37:00-20401-63-2] Process - data
[01/Jul/2008:19:37:00-20401-63-2] Process - data
[22/Jul/2008:19:37:00-20401-63-2] Process - data
[22/Jan/2008:19:37:00-20401-59-2] Process - data11
so here ,first i will grep for 'data11' and i will get the line number as 6.Then from the line6 ,i have to trace back and find out the immediate line which has the same timestamp.here it is [22/Jan/2008:19:37:00-20401-59-2].so the result line is 2.How to get this using grep?
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GREP(1) General Commands Manual GREP(1)
NAME
grep - search a file for lines containing a given pattern
SYNOPSIS
grep [-elnsv] pattern [file] ...
OPTIONS
-e -e pattern is the same as pattern
-c Print a count of lines matched
-i Ignore case
-l Print file names, no lines
-n Print line numbers
-s Status only, no printed output
-v Select lines that do not match
EXAMPLES
grep mouse file # Find lines in file containing mouse
grep [0-9] file # Print lines containing a digit
DESCRIPTION
Grep searches one or more files (by default, stdin) and selects out all the lines that match the pattern. All the regular expressions
accepted by ed and mined are allowed. In addition, + can be used instead of * to mean 1 or more occurrences, ? can be used to mean 0 or 1
occurrences, and | can be used between two regular expressions to mean either one of them. Parentheses can be used for grouping. If a
match is found, exit status 0 is returned. If no match is found, exit status 1 is returned. If an error is detected, exit status 2 is
returned.
SEE ALSO
cgrep(1), fgrep(1), sed(1), awk(9).
GREP(1)