how to delete filename's specific suffix in a dir, in linux
 Possible Duplicate:  
 Extract filename and extension in bash  
 Linux: remove file extensions for multiple files  
For example, A.txt B.txt, I want to rename then to A and B . 
How can I do it with shell script? Or other method ? Thanks.
I would use something like:
#!/bin/bash
for file in *.txt
do
    echo "$file" "$( echo $file | sed -e 's/.txt//' )"
done
Of course replace the two above references of ".txt" to whatever file extension you are removing, or, preferably just use $1 (the first passed argument to the script).
Michael G.
for i in *.txt; do mv "$i" "${i%.txt}"; done
for FILE in *.txt ; do mv -i "$FILE" "$(basename "$FILE" .txt)" ; done
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