I am learning regular expression in sed,Please help me understand the use curly bracket in sed, Post: 302904542

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Top Forums Shell Programming and Scripting I am learning regular expression in sed,Please help me understand the use curly bracket in sed, Post 302904542 by Antony Ankrose on Wednesday 4th of June 2014 03:49:34 PM

06-04-2014

Registered User

Thanks you very much , i got it clarified.

Please help me to understand sed statement

Question 2
-----------

Code:

Code:

/opt/oracle/work/antony>  ls -l | sed -n '/^.\{2,3\}w/p'
-rw-r-----   1 oracle     dba             11 Jun  2 15:28 control.sql
-rw-r-----   1 oracle     dba             50 Mar 24 16:40 db_list
-rw-r-----   1 oracle     dba            386 Jun  3 16:34 emp.1st
-rw-r-----   1 oracle     dba              0 Jun  3 16:39 sed
-rw-r-----   1 oracle     dba            327 Jun  2 15:09 stuff.sql
-rw-r-----   1 oracle     dba            120 Jun  3 20:10 teledir.txt
drwxr-x---   2 oracle     dba             96 Jun  3 17:14 test
-rwxr-xr-x   1 oracle     dba            330 Mar 24 16:42 trex.sh

From the above select statement,

1. i am not able to understand what is the use of curly brackets?
2. what is the use of {2,3\}w meant for?

Please explain

Last edited by Antony Ankrose; 06-04-2014 at 05:23 PM.. Reason: CODE tags added

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RADSQLRELAY(8)						     FreeRADIUS helper program						    RADSQLRELAY(8)

NAME

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SYNOPSIS

       radsqlrelay [-?]  [-d sql_driver] [-b database] [-f file] [-h host] [-u user] [-P port] [-p password] [-1] [-x] file_path

DESCRIPTION

       radsqlrelay  tails a SQL logfile and forwards the queries to a database server. Used to replicate accounting records to one (central) data-
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       -d sql_driver
	      Driver to use: mysql, pg, oracle.

       -b database
	      Name of the database to use.

       -f file
	      Read password from file, instead of command line.

       -h host
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       -u user
	      User for login.

       -P port
	      Port number to use for connection.

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	      Password to use when connecting to server.

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SEE ALSO

       rlm_sql_log(5)

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								   19 June 2005 						    RADSQLRELAY(8)