I have a log file for the year, which contains lines starting with the data in the format of YYYY-MM-DD. I need to get all the lines that contain the DD being 04, how would I do this? I tried using grep "*-*04" but it didn't work.
grep takes regular expressions, not globs, and in regular expressions, * means "zero or more of the previous character". So the first * did nothing, and the second * means "match any number of - characters". If you want to match zero or more of any character you can use the special "." character, like:
though I'd specify it a bit further so those *'s don't get out of control and try to match the entire line, like
I need to extract the date part from the file name (20080221 in this ex) and compare it with the current date and delete it, if it is a past date.
$file = exp_ABCD4_T-2584780_upto_20080221.dmp.Z
really appreciate any help.
thanks
mkneni (4 Replies)
Hi , I am having a script which will start a process and appends the process related logs to a log file. The log file writes logs with every line starting with date in the format of: date +"%Y %b %d %H:%M:%S".
So, in the script, before I start the process, I am storing the date as DATE=`date +"%Y... (5 Replies)
Hi again:
I have this file:
"2010-11-1 11:50:00",40894,13.38,17.24,12.92,13.23,"2010-11-14
11:43:02",12.56,"2010-11-14 11:46:02",22.68,20.95,"2010-11-14
11:44:03",2.144,2.078,190.4,14.27,6.293,"2010-11-14 ... (2 Replies)
You are given a 1 year logfile with each line starting with a date in the form “YYYY-MM-DD”. How would you extract logs from the 4th day of each month and put them into a new file (1 Reply)
Hi all,
Hope someone here will be able to help me. Our system has some scripts that are run from a cron job every ten mins and is used to see how many error there are in that time frame. Problem is that in the scripts grep is used to find the data, but as the day goes on these log file grow to a... (7 Replies)
Hi,
I am trying to extract lines of data within a log file on a Redhat 5 Linux system.
eg I need all the lines with a particular username over the last 3 minutes.
the log file may read like this, and I want a way to search all the lines extracting all the relevant lines over the last 3... (2 Replies)
I am running awk command to extract data from log file to calculate last 15 minutes log using below command and now i am getting bellow error:
awk '$0>=$from' from=$(`date -u +"####<%d-%b-%Y %H:%M:%S o'clock GMT>"-15min`) test.log
Error:
date: 0551-402 Invalid character in date/time... (8 Replies)
Hi
I have a daily rsync that runs and i am trying to find a easy way of extracting the start time and end time of the sync and extract the details of how much data was copied.
I would like to use this information to see if i can increase the amount of rsyncs that run in a day.
so the log... (3 Replies)
Hi,
I want to parse below file and Write a function to extract the logs between two given timestamp.
Apache (Unix) Log Samples - MonitorWare
The challenge here is there are three date and time format.
First :- 07/Mar/2004:16:05:49
Second :- Sun Mar 7 16:02:00 2004
Third :- 29-Mar... (6 Replies)
Discussion started by: sahil_shine
6 Replies
LEARN ABOUT BSD
fgrep
GREP(1) General Commands Manual GREP(1)NAME
grep, egrep, fgrep - search a file for a pattern
SYNOPSIS
grep [ option ] ... expression [ file ] ...
egrep [ option ] ... [ expression ] [ file ] ...
fgrep [ option ] ... [ strings ] [ file ]
DESCRIPTION
Commands of the grep family search the input files (standard input default) for lines matching a pattern. Normally, each line found is
copied to the standard output. Grep patterns are limited regular expressions in the style of ex(1); it uses a compact nondeterministic
algorithm. Egrep patterns are full regular expressions; it uses a fast deterministic algorithm that sometimes needs exponential space.
Fgrep patterns are fixed strings; it is fast and compact. The following options are recognized.
-v All lines but those matching are printed.
-x (Exact) only lines matched in their entirety are printed (fgrep only).
-c Only a count of matching lines is printed.
-l The names of files with matching lines are listed (once) separated by newlines.
-n Each line is preceded by its relative line number in the file.
-b Each line is preceded by the block number on which it was found. This is sometimes useful in locating disk block numbers by con-
text.
-i The case of letters is ignored in making comparisons -- that is, upper and lower case are considered identical. This applies to
grep and fgrep only.
-s Silent mode. Nothing is printed (except error messages). This is useful for checking the error status.
-w The expression is searched for as a word (as if surrounded by `<' and `>', see ex(1).) (grep only)
-e expression
Same as a simple expression argument, but useful when the expression begins with a -.
-f file
The regular expression (egrep) or string list (fgrep) is taken from the file.
In all cases the file name is shown if there is more than one input file. Care should be taken when using the characters $ * [ ^ | ( ) and
in the expression as they are also meaningful to the Shell. It is safest to enclose the entire expression argument in single quotes ' '.
Fgrep searches for lines that contain one of the (newline-separated) strings.
Egrep accepts extended regular expressions. In the following description `character' excludes newline:
A followed by a single character other than newline matches that character.
The character ^ matches the beginning of a line.
The character $ matches the end of a line.
A . (period) matches any character.
A single character not otherwise endowed with special meaning matches that character.
A string enclosed in brackets [] matches any single character from the string. Ranges of ASCII character codes may be abbreviated
as in `a-z0-9'. A ] may occur only as the first character of the string. A literal - must be placed where it can't be mistaken as
a range indicator.
A regular expression followed by an * (asterisk) matches a sequence of 0 or more matches of the regular expression. A regular
expression followed by a + (plus) matches a sequence of 1 or more matches of the regular expression. A regular expression followed
by a ? (question mark) matches a sequence of 0 or 1 matches of the regular expression.
Two regular expressions concatenated match a match of the first followed by a match of the second.
Two regular expressions separated by | or newline match either a match for the first or a match for the second.
A regular expression enclosed in parentheses matches a match for the regular expression.
The order of precedence of operators at the same parenthesis level is [] then *+? then concatenation then | and newline.
Ideally there should be only one grep, but we don't know a single algorithm that spans a wide enough range of space-time tradeoffs.
SEE ALSO ex(1), sed(1), sh(1)DIAGNOSTICS
Exit status is 0 if any matches are found, 1 if none, 2 for syntax errors or inaccessible files.
BUGS
Lines are limited to 256 characters; longer lines are truncated.
4th Berkeley Distribution April 29, 1985 GREP(1)