How to extract first column with a specific character

selamba_warrior · #1 (**permalink**) 05-22-2008

Hi All,

Below is the sample data of my files:

O|A|571000689|D|S|PNH|S|SI
sadm|ibscml1x|
I|A|571000689|P|S|PNH|S|SI
sadm|ibscml1x|
O|A|571000689|V|S|PNH|S|SI
sadm|ibscml1x|
S|C|CAM|D|S|PNH|R|ZOA|2004
bscml1x|
I|C|CAM|P|S|PNH|R|ZOA|2004
bscml1x|
O|C|CAM|V|S|PNH|R|ZOA|2004
bscml1x|

I need to extract the first column that only contain "I" only?

Please assists

Thanks

era · #2 (**permalink**) 05-22-2008

Code:

sed -n 's/^\(I\).*/\1/p' file

By "extract", do you really mean print only the first column? If not, maybe you mean

Code:

grep '^I' file

selamba_warrior · #3 (**permalink**) 05-22-2008

Dear era,

Thanks. It work.

Actually i'm looking to the first command:

sed -n 's/^\(I\).*/\1/p' file

Can u explain on this?

era · #4 (**permalink**) 05-22-2008

If the current line matches I at start of line (that's the caret ^), replace the whole line with just the part which matched (that's what the parentheses are for; they capture the match into \1) and print it.

More UNIX and Linux Forum Topics You Might Find Helpful
Thread	Thread Starter	Forum	Replies	Last Post
How to extract only first column from the file	selamba_warrior	Shell Programming and Scripting	11	05-21-2008 02:52 AM
How to extract a column from two different files in AWK?	solracq	Shell Programming and Scripting	7	04-29-2008 06:21 AM
column extract help	cvm	Shell Programming and Scripting	1	04-24-2008 04:19 PM
Extract column data from File	sudheshnaiyer	UNIX for Dummies Questions & Answers	3	10-11-2007 09:52 PM
extract column based on name	t27	UNIX for Dummies Questions & Answers	3	08-29-2007 01:04 PM

Thread Tools	Search this Thread
Show Printable Version Email this Page	Search this Thread: Advanced Search
Display Modes	Rate This Thread
Linear Mode Switch to Hybrid Mode Switch to Threaded Mode	Rate This Thread:


	Powered by