Hi All
I have a file aa.txt

I want to tar it. I'm using
tar -cvf aa.tar aa.txt

There's only one .txt file in my folder. I want to ls my folder, get the file's name and create a tar with its name

ls *.txt
aa.txt

And I want not to give the tar file's name directly, but use the result of ls as tar file's name. It's name will be aa.txt.tar

Thank you very much

You don't need ls, you probably want to look at the --wildcards parameter for tar.

Suppose that you wanted to archive all pdf files in ~/Documents, but many are in subdirectories. Or perhaps you want to archive pdf files in ~/Documents/ that are over 30 days old.

cd ~
find Documents -type f -iname "*.pdf" -ctime +30 -print0 | xargs -0 tar -C ~/ -czf pdf_archive_Feb16_2009.tar.gz

I used -print0 in case the filenames contained white space. Null characters are used instead of \n between filenames. The -0 argument to xargs will use those nulls to separate arguments.

You can do something similar with ls:
ls Documents/*.pdf | tr '\n' '\0' | xargs -0 tar -C ~/ -czf pdf_archive_Feb16_2009.tar.gz