touch

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touch [OPTION]... FILE...

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$ مستخدم عادي# بصلاحية root (أو مع sudo)

1. 1Create an empty file

   $touch notes.txt

   If it already exists, only its time changes.

2. 2Create many files at once

   $touch file{1..5}.txt

   Makes file1.txt to file5.txt. Good for practice.

3. 3Ask SELinux to relabel the whole system at the next boot

   #touch /.autorelabel

   Needed after a root password reset with rd.break, or after SELinux was disabled.

4. 4Set a file to an old date to test a cleanup script

   $touch -d "40 days ago" /tmp/test-old.log
   $find /tmp -name "*.log" -mtime +30

   The file looks 40 days old, so your find -mtime +30 test can find it.

5. 5Give a file the same time as another file

   $touch -r original.conf copy.conf

   Keeps times equal, for example after you fix a copy.

6. 6Set an exact time with -t

   $touch -t 202601011200 newyear.txt

   2026-01-01 12:00.

7. 7Change only the access time

   $touch -a report.pdf

   The modification time stays the same.

8. 8Do not create a missing file

   $touch -c maybe.txt

   No error and no new file if it does not exist.

9. 9Create a flag file for a maintenance window

   #touch /etc/nologin

   While this file exists, normal users cannot log in (root still can). Remove it after the work.

10. 10Make an empty log file with the right owner

    #touch /var/log/myapp.log && chown myapp: /var/log/myapp.log

    The service can write to it at its first start.

11. 11Check if a folder is writable in a script

    $touch /mnt/nfs/.write-test && rm /mnt/nfs/.write-test && echo "writable"

    A simple test before a backup job writes to a share.

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