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Full Discussion: I am learning regular expression in sed,Please help me understand the use curly bracket in sed,
Top Forums Shell Programming and Scripting I am learning regular expression in sed,Please help me understand the use curly bracket in sed, Post 302904528 by Antony Ankrose on Wednesday 4th of June 2014 02:16:37 PM
Old 06-04-2014
Debian I am learning regular expression in sed,Please help me understand the use curly bracket in sed,
I am learning SED and just following the shell scripting book, i have trouble understanding the grep and sed statement,

Question : 1
__________
Code:
/opt/oracle/work/antony>cat teledir.txt
jai sharma 25853670
chanchal singhvi 9831545629
anil aggarwal 9830263298
shyam saksena 23217847
lalit chowdury 26688726


[quint2]PCID
/opt/oracle/work/antony> grep '[0-9]\{10\}' teledir.txt 
chanchal singhvi 9831545629
anil aggarwal 9830263298

To my understanding , the above select will look for the number between 0 to 9 which should no exceed character 10.

If my above statement correct, then i should get the 8 digit mobile number in below select statement, but i am getting 10 and 8 digit number. it suppose to look for 0 to 9 and give 8 digit mobile number. please correct me if i am wrong.

Code:
/opt/oracle/work/antony>  grep '[0-9]\{8\}' teledir.txt
jai sharma 25853670
chanchal singhvi 9831545629
anil aggarwal 9830263298
shyam saksena 23217847
lalit chowdury 26688726

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

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. \{2,3\}w/p' - what does each argument meant for ?
3. what is the use of w,{2,3\}?

Please explain

Thanks

Antony Ankrose J
Last edited by Antony Ankrose; 06-04-2014 at 04:03 PM.. Reason: Please use [code][/code] tags.
 

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LEARN ABOUT DEBIAN

rt-setup-database-4

rt-setup-database(8)					     Request Tracker Reference					      rt-setup-database(8)

NAME

       rt-setup-database - Set-up the database for Request Tracker

SYNOPSIS

	   rt-setup-database --action ...

OPTIONS

       action
	   Several actions can be combined using comma separated list.

	   init
	       Initialize the database. This is combination of multiple actions listed below.  Create DB, schema, setup acl, insert core data and
	       initial data.

	   upgrade
	       Apply all needed schema/acl/content updates (will ask for version to upgrade from)

	   create
	       Create the database.

	   drop
	       Drop the database.  This will ERASE ALL YOUR DATA.

	   schema
	       Initialize only the database schema

	       To use a local or supplementary datafile, specify it using the '--datadir' option below.

	   acl Initialize only the database ACLs

	       To use a local or supplementary datafile, specify it using the '--datadir' option below.

	   coredata
	       Insert data into RT's database. This data is required for normal functioning of any RT instance.

	   insert
	       Insert data into RT's database.	By default, will use RT's installation data.  To use a local or supplementary datafile, specify it
	       using the '--datafile' option below.

       datafile
	   file path of the data you want to action on

	   e.g. "--datafile /path/to/datafile"

       datadir
	   Used to specify a path to find the local database schema and acls to be installed.

	   e.g. "--datadir /path/to/"

       dba dba's username

       dba-password
	   dba's password

       prompt-for-dba-password
	   Ask for the database administrator's password interactively

       skip-create
	   for 'init': skip creating the database and the user account, so we don't need administrator privileges

       root-password-file
	   for 'init' and 'insert': rather than using the default administrative password for RT's "root" user, use the password in this file.

perl v5.14.2							    2013-05-22						      rt-setup-database(8)
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