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Rename contents inside multiple files

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# 1  
Old 02-16-2010
Rename contents inside multiple files
Hi,
I have 100 files in a directory.

Each file have the following format

Code:
>CtbRe01234
  fdfjdhfkdfkd
>CtL2B0456
  gjfgfkgjfkgjfk
>CmdrE05768
   fghdjskksllfk

Like this I have many files in the directory.

What I want is; rename the header content in each file such that the above file will look below;

Code:
>CtbRe
  fdfjdhfkdfkd
>CtL2B
  gjfgfkgjfkgjfk
>CmdrE
   fghdjskksllfk

That is, rename >CtbRe01234 to >CtbRe or in other words, retain only the first 5 character (excluding >) as headers of the content in each file.

Remember, this 5 character header may include a digit in some cases like in >CtL2B.

Please let me know the best way in awk or using regular expressions to edit the header content in each of the files in a directory.

LA
# 2  
Old 02-16-2010
Code:
awk '/^>/{$0=substr($0,1,6)}1'

# 3  
Old 02-16-2010
Thanks,
Does this can be applied to the whole directory. Let me know
# 4  
Old 02-16-2010
Sorry, I forgot explain XD.

/^>/{$0=substr($0,1,6)}
If a line starts with ">" then cuts the line to 6 chars
1
For all the lines execute the dafault action, this is print $0
# 5  
Old 02-16-2010
Code:
$ cat data
>CtbRe01234
  fdfjdhfkdfkd
>CtL2B0456
  gjfgfkgjfkgjfk
>CmdrE05768
   fghdjskksllfk

sed 's/^\(>.....\).*$/\1/' data
>CtbRe
  fdfjdhfkdfkd
>CtL2B
  gjfgfkgjfkgjfk
>CmdrE
   fghdjskksllfk

# 6  
Old 02-16-2010
Sure Lucky Ali, you can apply to multiple files just need a FOR

Code:
for curFile in `ls test*txt` ; do 
	cat $curFile | awk '/^>/{$0=substr($0,1,6)}1' > temp.tmp
	mv temp.tmp $curFile
done



---------- Post updated at 10:47 AM ---------- Previous update was at 10:44 AM ----------

Good sed alister, you can even manke it a little bit shorter

Code:
sed 's/^>.....//' data

and with -i you can work in the same file so you won't need a temp file like me

I like it

Code:
for curFile in `ls test*txt` ; do 
	sed -i 's/^>.....//' $curFile
done

# 7  
Old 02-16-2010
Quote:
Originally Posted by kcoder24
Good sed alister, you can even manke it a little bit shorter

Code:
sed 's/^>.....//' data

and with -i you can work in the same file so you won't need a temp file like me

I like it
Nope. You can't do that. That will delete the 6 characters you want to keep. Regarding the -i option, that's fine but it's non-standard. If portability to other systems is ever a concern, stay away from -i.

Regards,
alister
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