Question

i have some files in a folder with names like abc_old.php now i want to rename them as abc.php that is i want to remove that “_old” from all of my file names.How can i do this in one go ????

Answer 1

Shell facilities are going to be limited via FTP. I would copy the files across to a local directory. In bash (given that in the above you claim to have Linux available):

for filename in *_old.php
do
  mv $filename ${filename%_old.php}.php
done

The % operator matches the end of the string and returns $filename without the matched segment (the bit after the %). Hence the above chops the _old.php and then substitutes a .php.

I have not tested the above. Try it on a dummy directory first.