- creation of empty files
other features in original touch
- detection of existing files
- update access/modification time stamps
| OS | Path | Size (Bytes) |
|---|---|---|
| FreeBSD 9.2 | /usr/bin/touch | 12200 |
| Arch Linux | /bin/touch | 60288 |
| 50 bytes (our touch-ng now) | ||
cp from /dev/null, then it will create a new empty file
Notice : original touch can change Access/Modify/Change time without any permission
stat command can get time info of files
- O : update
- X : not modify
| Command | Access | Modify | Change | note |
|---|---|---|---|---|
| touch | O | O | O | |
| touch -a | O | X | O | |
| head -c1 | O | X | X | need read permission |
| chmod | X | X | O | chmod permission |
| echo "" >> | X | O | O | need write permission |