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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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