Master the Linux touch Command: Change Timestamps and Control File Creation

Overview

The touch command is a standard Linux utility used to create an empty file or to modify a file's access and modification timestamps. It supports a range of options for fine‑grained control.

Basic usage

Change a file's timestamps.

Create a new empty file when the specified pathname does not exist.

Preventing file creation

To update timestamps without creating a new file when the target does not exist, use the -c (no‑create) option.

touch -c filename

Changing only the access time

Use the -a option (access) to modify only the access time while leaving the modification time unchanged. touch -a file Verify the result with stat file; the Access field changes, Modify remains the same.

Changing only the modification time

Use the -m option (modify) to update only the modification time. touch -m file Check with stat file; the Modify field changes, Access stays unchanged.

Setting a custom timestamp

Two methods allow explicit timestamp assignment:

Using -t with the format [[CC]YY]MMDDhhmm[.SS]. Example sets both timestamps to 2020‑01‑01 20:20:20: touch -t 202001012020.20 file Using -d with a date string. Example sets timestamps to 2008‑08‑08 00:00:00: touch -d '08-August-2008' file The -d option also accepts flexible expressions such as yesterday, 1 year ago, or combined strings like 'yesterday 08-August-2008'.

Changing time zone

When using -d, append a time‑zone identifier to interpret the date in that zone, e.g.:

touch -d '2020-01-01 12:00:00 UTC' file

Viewing file details

The stat command displays full file metadata, confirming the effects of each touch operation.