I’d like edit a file with sed on OS X. I’m using the following command: sed ‘s/oldword/newword/’ file.txt The output is sent to the terminal. file.txt is not modified. The changes are saved to file2.txt with this command: sed ‘s/oldword/newword/’ file1.txt > file2.txt However I don’t want another file. I just want to edit file1.txt. … Read more
This is a long text. Please bear with me. Boiled down, the question is: Is there a workable in-place radix sort algorithm? Preliminary I’ve got a huge number of small fixed-length strings that only use the letters “A”, “C”, “G” and “T” (yes, you’ve guessed it: DNA) that I want to sort. At the moment, … Read more
list.sort() sorts the list and replaces the original list, whereas sorted(list) returns a sorted copy of the list, without changing the original list. When is one preferred over the other? Which is more efficient? By how much? Can a list be reverted to the unsorted state after list.sort() has been performed? 6 Answers 6
How can I convert tabs to spaces in every file of a directory (possibly recursively)? Also, is there a way of setting the number of spaces per tab? 19 Answers 19
I know the question is not too specific. All I want is someone to tell me how to convert a normal merge sort into an in-place merge sort (or a merge sort with constant extra space overhead). All I can find (on the net) is pages saying “it is too complex” or “out of scope … Read more
How would I use sed to delete all lines in a text file that contain a specific string? 20 20 To remove the line and print the output to standard out: sed ‘/pattern to match/d’ ./infile To directly modify the file – does not work with BSD sed: sed -i ‘/pattern to match/d’ ./infile Same, … Read more
