Monthly Archives: May 2013

Sometimes, it is useful to copy files while preserving its timestamps. cp -a source dest scp -p source dest To cp without replacement, we can use rsync -au source/ dest/

1) To replace a string oldstring to newstring in some files, do sed -i ‘s/oldstring/newstring/g’ files 2) to reload files in email, just do ctrl c + ctrl v 3) to rename files in batch, do rename ‘s/oldstring/newstring/’ files