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Repair common Windows errors and clear accumulated junk for a smoother, more stable PC - no reinstall needed.Free scan · no reinstallCrashes, No Sound, or Screen Glitches?
Random freezes, missing sound and display glitches usually trace back to one bad driver. Find and replace yours safely.Free scan · under a minuteUse touch filename to create an empty file, or use shell redirection with printf when you want to put text in it. The key difference: touch leaves existing file contents intact, while > replaces them and >> appends.
Create an empty file without changing its contents
Run touch with the file name:
touch notes.txtIf notes.txt does not exist, GNU Coreutils 9.11 creates it as an empty file. If it already exists, touch updates its timestamps rather than clearing its contents. It is primarily a timestamp utility; creating a missing file is one of its effects. See the GNU Coreutils 9.11 touch documentation.
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For an empty file, shell redirection is another option:
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Create a file and write text to it
Use printf to supply the text and > to write it to a file:
printf '%sn' 'First line' > notes.txtIf the file is missing, the shell creates it. If it already exists, the shell truncates it before writing, replacing its previous contents. The POSIX.1-2017 Shell Command Language specification defines these redirection behaviors.
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Append text without replacing what is there
Use >> when new text should follow existing contents:
printf '%sn' 'Another line' >> notes.txtIf the file does not exist, it is created; if it does exist, the new output is appended. This is the safer choice when you need to keep the file’s existing text.
Write piped output with tee
tee copies standard input to both standard output and a named file:
printf '%sn' 'Hello' | tee greeting.txtA missing output file is created. By default, an existing file is overwritten; add -a to append instead:
printf '%sn' 'More' | tee -a greeting.txtGNU documents these behaviors in its Coreutils manual.
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Choose the command by its effect
| Goal | Command | Effect if the file already exists |
|---|---|---|
| Create an empty file or leave existing contents alone | touch notes.txt |
Preserves contents and updates timestamps |
| Create a file or make it empty | : > notes.txt |
Truncates it to empty |
| Write text or replace existing text | printf '%sn' 'First line' > notes.txt |
Replaces existing contents |
| Add text while keeping existing contents | printf '%sn' 'Another line' >> notes.txt |
Appends |
| Send piped output to a file and the terminal | printf '%sn' 'Hello' | tee notes.txt |
Overwrites by default; use tee -a to append |
If the file cannot be created
Check the spelling and location of the path, then confirm that you can write to its parent directory. Shell redirection fails when the destination cannot be opened or created, for example because the directory is not writable. POSIX specifies the redirection operation but does not establish a single numeric permission mode that applies to every setup.
What is portable across Unix-like systems?
The redirection examples describe POSIX shell behavior. The touch behavior cited here comes from GNU Coreutils 9.11, which is applicable to GNU/Linux; Unix-like systems may ship other utility implementations, so GNU-specific options should not be assumed to work identically everywhere. The POSIX touch specification also describes creating a missing file.
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