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Cutting last few characters of file name

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# 1  
Old 09-23-2008
Cutting last few characters of file name
Dear Friends,
Here I have two queries.

1. Want to make folder named as last three characters of a file name (length of file name can vary file to file)
E.g File name is AAAACCCCBBBB.txt (12 Characters excluding file extension) then folder to be created is BBB

Irrespective of length of file name, script should use only last 3 characters (Excluding file extension) to make folder.


2. What can i do to grep 50th line of each txt file in a directory?

SmilieWaiting for your reply
# 2  
Old 09-23-2008
1:sed 's/^.*\(...\)\..*/\1/'

2:sed -n '1,50 p'
# 3  
Old 09-23-2008
Dear friend, i m new to Unix... can u please suggest me some easy to understand commands... especially for 1st query
# 4  
Old 09-23-2008
Quote:
Originally Posted by anushree.a
Dear Friends,
Here I have two queries.

1. Want to make folder named as last three characters of a file name (length of file name can vary file to file)
E.g File name is AAAACCCCBBBB.txt (12 Characters excluding file extension) then folder to be created is BBB

Irrespective of length of file name, script should use only last 3 characters (Excluding file extension) to make folder.
if you have Python and can use it, here's an alternative
Code:
import os
DIR="/home/path"
for files in os.listdir(DIR):
    if os.path.isfile(files) and files.startswith("AAAA"):
        folderToBeCreated = files.split(".")[:-1][-1][-3:]
        folderToBeCreated = os.path.join(DIR,folderToBeCreated )
        if not os.path.exists( folderToBeCreated ):
            os.mkdir(folderToBeCreated)

Quote:
2. What can i do to grep 50th line of each txt file in a directory?

SmilieWaiting for your reply
Code:
import os
DIR="/home/path"
for files in os.listdir(DIR):
    if os.path.isfile(files) and files.startswith("AAAA"):
        for n,lines in enumerate(open(files)):
            if n==49: 
                print lines.strip()  #print 50th line
                break

# 5  
Old 09-30-2008
Dear frnds,
I have tried solution given by Fedora (sed 's/^.*\(...\)\..*/\1/'), but its not working (Nothing is happening).. please tell me if there is some alternate solution?
# 6  
Old 09-30-2008
Quote:
Originally Posted by anushree.a
Dear frnds,
I have tried solution given by Fedora (sed 's/^.*\(...\)\..*/\1/'), but its not working (Nothing is happening).. please tell me if there is some alternate solution?
What did you try and is not working?
Code:
echo 'AAAACCCCBBBB.txt' | sed 's/^.*\(...\)\..*/\1/'

# 7  
Old 09-30-2008
Thanx for your reply. Its working fine. I have a request. Can some one please please explain me this command briefly?
I got it till echo 'AAAACCCCBBBB.txt' | sed 's/^.*\(...\)
but didnt get remaining part i.e \..*/\1/'
Last edited by anushree.a; 09-30-2008 at 02:18 AM.. Reason: To Simplify the prob
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