Without redirection, Luc Vu or Erik Konstantopoulos point out to: copy NUL EMptyFile.txt copy /b NUL EmptyFile.txt “How to create empty text file from a batch file?” (2008) also points to: type NUL > EmptyFile.txt # also echo. 2>EmptyFile.txt copy nul file.txt > nul # also in qid’s answer below REM. > empty.file fsutil file … Read more
This is a way to traverse every file and directory in a directory tree: import os for dirname, dirnames, filenames in os.walk(‘.’): # print path to all subdirectories first. for subdirname in dirnames: print(os.path.join(dirname, subdirname)) # print path to all filenames. for filename in filenames: print(os.path.join(dirname, filename)) # Advanced usage: # editing the ‘dirnames’ list … Read more
If you mean File.separator and File.pathSeparator then: File.pathSeparator is used to separate individual file paths in a list of file paths. Consider on windows, the PATH environment variable. You use a ; to separate the file paths so on Windows File.pathSeparator would be ;. File.separator is either / or \ that is used to split … Read more
If you’ve definitely got an absolute path, use Path.GetDirectoryName(path). If you might only get a relative name, use new FileInfo(path).Directory.FullName. Note that Path and FileInfo are both found in the namespace System.IO.
To check if a file doesn’t exist, equivalent to Python’s if not os.path.exists(filename): if _, err := os.Stat(“/path/to/whatever”); errors.Is(err, os.ErrNotExist) { // path/to/whatever does not exist } To check if a file exists, equivalent to Python’s if os.path.exists(filename): Edited: per recent comments if _, err := os.Stat(“/path/to/whatever”); err == nil { // path/to/whatever exists } … Read more
Have a look at the split command: $ split –help Usage: split [OPTION] [INPUT [PREFIX]] Output fixed-size pieces of INPUT to PREFIXaa, PREFIXab, …; default size is 1000 lines, and default PREFIX is `x’. With no INPUT, or when INPUT is -, read standard input. Mandatory arguments to long options are mandatory for short options … Read more
TL;DR while(!feof) is wrong because it tests for something that is irrelevant and fails to test for something that you need to know. The result is that you are erroneously executing code that assumes that it is accessing data that was read successfully, when in fact this never happened. I’d like to provide an abstract, … Read more
Assuming there is one number per line: sort <file> | uniq -c You can use the more verbose –count flag too with the GNU version, e.g., on Linux: sort <file> | uniq –count
Use os.path.getsize(path) which will Return the size, in bytes, of path. Raise OSError if the file does not exist or is inaccessible. import os os.path.getsize(‘C:\\Python27\\Lib\\genericpath.py’) Or use os.stat(path).st_size import os os.stat(‘C:\\Python27\\Lib\\genericpath.py’).st_size Or use Path(path).stat().st_size (Python 3.4+) from pathlib import Path Path(‘C:\\Python27\\Lib\\genericpath.py’).stat().st_size
If your grep has the -L (or –files-without-match) option: $ grep -L “foo” *