no grep, no perl, no pipe.
even better in zsh/bash4:
for i in **/*oldname*; do "mv $i ${i/oldname/newname/}"; done
No find, no grep, no perl, no pipe
This is better than doing a "for `find ...`; do ...; done", if any of the returned filenames have a space in them, it gets mangled. This should be able to handle any files. Of course, this only works if you have rename installed on your system, so it's not a very portable command.
Any thoughts on this command? Does it work on your machine? Can you do the same thing with only 14 characters?
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find -name "*oldname*"
b) piping something to grep and then to one of the following is ALWAYS a waste: sed, awk, perl. You can get rid of grep and convert your perl to:perl -n -e '/^(.*)(oldname)(.*$)/ && print "mv $& $1newname$3\n"'
find . -name "*oldname*" -exec prename 's/oldname/newname/' {} +
If you are not quoting the *oldname* expression then find is matching only files&directories in the current directory because the shell is expanding *oldname* before find even gets called.