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--- directory:monitor_a_directory_for_changes:using_incron [2021/01/26 11:28] – peter
+++ directory:monitor_a_directory_for_changes:using_incron [2022/06/13 09:17] (current) – removed peter
@@ Line 1: / Line 1: @@
-====== Directory - Monitor a directory for changes - Using incron ======
-**incron** is like cron but instead of time-based events, the events are based on file notifications.
-----
-===== Install incron =====
-<code bash>
-sudo apt install incron
-</code>
-----
-===== Change Permissions =====
-Add users to the **/etc/incron.allow** file who are allowed to use incron.
-<file bash /etc/incron.allow>
-peter
-</file>
-<WRAP info>
-**NOTE:**  One user per line.
-**/etc/incron.deny** can also be used to specifically prevent usage of incron by a user.
-</WRAP>
-----
-===== Monitor =====
-Edit the incron table:
-<code bash>
-incrontab -e
-</code>
-and populate with:
-<code>
-/home/peter/some_dir_to_monitor IN_CLOSE_WRITE,IN_MOVED_TO /home/peter/some_program_to_run $@/$#
-</code>
-<WRAP info>
-**NOTE:**  The format is very picky; use spaces, not tabs!
-  * The format is **path mask command**.
-This monitors the directory for changes and runs the program passing along some parameters:
-  * **$@/$#**:  Provides a full path to the file affected.
-Other parameters can also be included, such as:
-  * **$$**:  Prints a dollar sign.
-  * **$@**:  The watched filesystem path.
-  * **$#**:  The event-related file name.
-  * **$%**:  The event flags/time (textually).
-  * **$&**:  The event flags.time (numerically).
-Events to monitor include:
-  * **IN_ACCESS**:  If a file is accessed or read.
-  * **IN_ATTRIB**:  If metadata of a file change (e.g. timestamps, permissions).
-  * **IN_CLOSE_WRITE**:  If a file opened for writing is closed.
-  * **IN_CLOSE_NOWRITE**:  If a file or directory not opened for writing is closed.
-  * **IN_CREATE**:  If a file or directory is created in a watched directory.
-  * **IN_DELETE**:  If a file or directory is deleted from a watched directory.
-  * **IN_DELETE_SELF**:  If a watched file or directory is deleted (or moved to a different filesystem).
-  * **IN_MODIFY**:  If a file was modified.
-  * **IN_MOVE_SELF**:  If a watched file or directory is moved within the filesystem.
-  * **IN_MOVED_FROM**:  If a file or directory is moved out of the watched directory.
-  * **IN_MOVED_TO**:  A file or directory is moved to the watched directory.
-  * **IN_OPEN**:  A watched file or directory is opened.
-</WRAP>
-----
-===== List the incron table =====
-<code bash>
-incrontab -l
-</code>