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Create a new file from another file with lines begins with a specific string

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Top Forums Shell Programming and Scripting Create a new file from another file with lines begins with a specific string
# 1  
Old 09-01-2014
Create a new file from another file with lines begins with a specific string
Hi,

I have a file with below format
myfile.txt
Code:
aa
aa1
aa2
qq
aa4
ghs
aa6
bbc
gdf

I m looking to create a file where lines begins with aa.

myfile1.txt
Code:
aa
aa1
aa2
aa4
aa6

Regards,
Litu
Last edited by Franklin52; 09-01-2014 at 11:30 AM.. Reason: Please use code tags
# 2  
Old 09-01-2014
What have yuo tried so far?
# 3  
Old 09-01-2014
Code:
cat /myfile.txt | awk '$1 ~ /^ aa*/' > /mynew.txt

---------- Post updated at 08:17 PM ---------- Previous update was at 08:13 PM ----------

Code:
awk '/aa/' /myfile.txt > newfile.txt

this seems to work. However i am looking for something without use of awk command.
Last edited by Scrutinizer; 09-01-2014 at 11:48 AM.. Reason: code tags
# 4  
Old 09-01-2014
Hello Litu,

awk can read the file so there is no need to add cat command there. You have got UUCA award Smilie Useless Use of Cat Award

Also you can remove starting space in following /^aa/ then you will get the correct output.


EDIT: Changed aa* to aa in suggestion. grep command can help us here for same.

Code:
grep "^aa" filename

Output will be as follows.

Code:
aa
aa1
aa2
aa4
aa6


Thanks,
R. Singh
Last edited by RavinderSingh13; 09-01-2014 at 11:55 AM.. Reason: Adding one more solution to same, corrected awk solution
# 5  
Old 09-01-2014
Try:
Code:
grep '^aa' file > newfile

----
Quote:
Originally Posted by RavinderSingh13
[..]Also you can remove starting space in following /^aa*/ [][..]
That should be
Code:
/^aa/

This User Gave Thanks to Scrutinizer For This Post:
RavinderSingh13
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