02-14-2008
Quote:
Originally Posted by
maverix
good that you found it useful!!!
check out the man pages for tail, awk and grep to understand how it works.
In particular, check the switches I've used for each command.
Don't think I am being rude to you.
You must have heard the good old story where the fisherman taught a starving person to fish, rather than giving him few of his catch :-)
cheers
maverix
I understood your usage of command.
10 More Discussions You Might Find Interesting
1. Shell Programming and Scripting
Hi,
I need to create a script that does the following:
1. Read the file for the occurrences of "EXECUTE" and "END" strings.
There will be several occurrences of EXECUTE and END strings on the file.
2. The resulting lines in #1, needs to be searched for the word... (11 Replies)
Discussion started by: racbern
11 Replies
2. Shell Programming and Scripting
Hi Gurus,
I have a file say for ex. file1 which has 3500 lines in it which are different account numbers and another file (file2) which has 230000 lines in it. I want to read all the lines in file1 and delete all those lines from file2 which has that same pattern as in file1. I am not quite... (4 Replies)
Discussion started by: toms
4 Replies
3. Shell Programming and Scripting
hi,
I have the following file
hello
world
this
is
to
say
bye
to
everyone
so
bye
I want to get the lines from hello to the first bye inclusive into another file?
how can I do this (11 Replies)
Discussion started by: JamesByars
11 Replies
4. Shell Programming and Scripting
Hi All,
I have a small query. I have a file containing the following lines
File 1:
29-Jul-2011 GMT Static data requires update <Extraction should start here>
-----------
-----------
--------------------
-----------------------
----------- <should stop here>
Pattern1 will be time... (2 Replies)
Discussion started by: gangii87
2 Replies
5. Shell Programming and Scripting
Thanks for the help yesterday. I have a little modification today,
I am trying the following:
i have a log file of a webbap which logs in the following pattern:
2011-08-14 21:10:04,535 blablabla ERROR Exception1 blablabla
bla
bla
bla
bla
2011-08-14... (2 Replies)
Discussion started by: ppolianidis
2 Replies
6. Shell Programming and Scripting
Guys,
I am trying the following:
i have a log file of a webbap which logs in the following pattern:
2011-08-14 21:10:04,535 blablabla ERROR blablabla
bla
bla
bla
bla
2011-08-14 21:10:04,535 blablabla ERROR blablabla
bla
bla
bla
... (6 Replies)
Discussion started by: ppolianidis
6 Replies
7. Shell Programming and Scripting
Greetings experts. Searched the forums (perhaps not hard enough?) - Am searching for a method to capture all output from a log file following the nth occurrence of a known string.
Background:
Using bash, I want to monitor my Oracle DB alert log file. The script will count the total # of... (2 Replies)
Discussion started by: cjtravis
2 Replies
8. Shell Programming and Scripting
I need help with extract/print lines till stop pattern. This needs to happen after every 3rd occurrence of start pattern and continue till end of file. Consider below is an example of the log file. my start pattern will be every 3rd occurrence of ERROR_FILE_NOT_FOUND and stop pattern will be... (5 Replies)
Discussion started by: NSS
5 Replies
9. UNIX for Beginners Questions & Answers
Hi all,
I'm looking for a way (sed or awk) to delete multiple lines between blank lines containing two patterns ex:
user: alpha
parameter_1 = 15
parameter_2 = 1
parameter_3 = 0
user: alpha
parameter_1 = 15
parameter_2 = 1
parameter_3 = 0
user: alpha
parameter_1 = 16... (3 Replies)
Discussion started by: ce9888
3 Replies
10. UNIX for Beginners Questions & Answers
Hi, I need to print lines which are matching with start pattern "SELECT" and END PATTERN ";" and only select the last "select" statement including the ";" .
I have attached sample input file and the desired input should be as:
INPUT FORMAT:
SELECT
ABCD,
DEFGH,
DFGHJ,
JKLMN,
AXCVB,... (5 Replies)
Discussion started by: nani2019
5 Replies
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; unless the -h flag is used, the file name is shown if there is more than one input file.
Grep patterns are limited regular expressions in the style of ed(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.
-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 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.
-s No output is produced, only status.
-h Do not print filename headers with output lines.
-y Lower case letters in the pattern will also match upper case letters in the input (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.
-x (Exact) only lines matched in their entirety are printed (fgrep only).
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 matches that character.
The character ^ ($) matches the beginning (end) of a line.
A . 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 * (+, ?) matches a sequence of 0 or more (1 or more, 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.
SEE ALSO
ed(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
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.
Lines are limited to 256 characters; longer lines are truncated.
GREP(1)