How can move the file and change the file extension with simple bash?

Question

Select file which contains sqlite in my current directory:

ls | grep sqlite
null and empty string in sqlite.txt
pythoin write None into sqlite.txt

Move them into /tmp directory:

ls |grep sqlite |xargs -i mv {}  /tmp
ls /tmp | grep sqlite
null and empty string in sqlite.txt
pythoin write None into sqlite.txt

How can move them into /tmp and change the file extension as rst at the same time?

ls |grep sqlite | some_simple_bash_command

After executing it:

ls /tmp | grep sqlite
null and empty string in sqlite.rst
pythoin  write None   into sqlite.rst     

@David C. Rankin,grep sqlite * can't work at all!

Answer 1

Try this Shellcheck-clean code:

for f in *sqlite*; do
    mv -v -- "$f" "/tmp/${f%.*}.rst"
done

• *sqlite* expands to the list of files in the current directory that contain the string sqlite anywhere in their names. See the Pattern Matching section of the Bash Reference Manual.
• ${f%.*} expands to the value of $f with any suffix removed. See Removing part of a string (BashFAQ/100 (How do I do string manipulation in bash?)).
• The -- argument to mv is to ensure proper handling of files whose names begin with -. See Bash Pitfalls #2 (cp $file $target).