Truncate multiple file extensions

Shell Programming and Scripting
1

Hi,

I have files with names like file1.txt.txt.txt.txt and file2.txt.txt.txt.txt.txt............ (random infinite number of .txt exist).

how to truncate (mv) their names to ones with single .txt extension like file1.txt and file1.txt ? In other words, how to extract the filename upto first extension part?

Txs
Prvn

2

Do something like this---

mv file1.txt.txt* file1.txt
mv file2.txt.txt* file2.txt

or

sed s/file1.txt.txt*/file1.txt

Thanks
Namish

3

Hi try this one:

echo "number"
read num
who | nawk -v n=$num 'BEGIN{
str="file"
for (i=1;i<=n;i++)
str=sprintf("%s%s",str,".txt")
}
END{
print str
printf("%stxt\n",substr(str,1,index(str,".")))
}'
4

Txs namishtiwari,

But i have to do this for thousands of files in a directory so i cant use hardcoded filename. i will be using for loop for reading each file name. So, here how could i extract the "filename with first extension" out of "filename with infinite extensions"?

txs summer_cherry, here i dont know what is "number"..

5

Summer_cherry is just doing a echo of number,nothing to do with number that is not a variable.Whatever you do with echo that is excatly printed again.If you do not understand the code let me know i will tell you.

Thanks
Namish

6

Namish,

I know what " echo "number" " does and there's nothing hard to understand there. But his code expects again a "num".

I'm not sure if you read my post fully and again i repeat "how could i extract the "filename with first extension" out of "filename with infinite extensions"?" e.g., how to extract "file1.txt" from file1.txt.txt.txt..........? (no hardcoding of filenames with wild char pls..)

Regards,

Prvn

7

suppose you enterd num as 5,then it will print a file that is having a extension of
file1.txt.txt.txt.txt.txt
and reduce it to
file1.txt

8

if you have Python, here's an alternative

#!/usr/bin/python
import os,glob
for files in glob.glob("file*.txt"):
    s= files.split(".")
    newfile='.'.join(s[:2])
    os.rename(files,newfile)

output:

# ls -1 file*.txt
file 2.txt.txt.txt.txt
file1.txt.txt.txt.txt
# python testing.py
# ls -1 file*.txt
file 2.txt
file1.txt
9 
[/tmp]$ touch 1.txt 2.txt.txt 3.txt.txt.txt
[/tmp]$ ls *.txt
1.txt  2.txt.txt  3.txt.txt.txt
[/tmp]$ for file in *.txt; do mv ${file} ${file%%.txt*}.txt 2> /dev/null ; done
[/tmp]$ ls *.txt
1.txt  2.txt  3.txt
[/tmp]$
10

Great Vino..... it worked like a charm...Txs for your wonderful solution...

Txs ghostdog74, but i dont have python....

11

dear Vino,

I am really curious to know the expression ${file%%.txt} .

Please can you explain it to me.
I was looking for a solution to extract the extrension of a file name. I wanted to split a file by line numbers but the unix split command splits the file with suffix is aa, ab, ac etc which I want to convert into 00, 01 etc and I was struggling to get the extension part.

Thanks a lot in anticipation.

12

Type "man split" and you'll find your answer.

13 
for i in file*.txt*
do
      newname=$(echo $i | cut -d. -f1-2)
      mv $i $newname
done