acl_cmp - Linux
Overview
acl_cmp compares two files based on their access control lists (ACLs) and returns whether they are identical. It is a useful tool for checking ACL consistency, detecting unauthorized changes, or verifying compliance with access control policies.
Syntax
acl_cmp [options] file1 file2
Options/Flags
-
-H, –help
Display this help message and exit. -
-V, –version
Print version information and exit. -
-b, –binary
Perform a binary comparison of the ACLs. This ignores any formatting differences. -
-c, –compact
Display a compact summary of the comparison results. -
-d, –debug
Enable debugging output. -
-f, –fix
Fix minor differences in the ACLs. This option is only effective when-b
is also specified.
Examples
Simple comparison:
acl_cmp file1 file2
Binary comparison, ignoring formatting:
acl_cmp -b file1 file2
Compact summary of differences:
acl_cmp -c file1 file2
Fix minor differences and display debugging output:
acl_cmp -fb -d file1 file2
Common Issues
-
Insufficient permissions: Ensure that you have sufficient permissions to read the ACLs of the specified files.
-
Incorrect ACL format: The ACLs of the files must be in a valid format for the comparison to be successful.
-
File not found: Verify that the specified files exist and are accessible.
Integration
Combining with other commands:
-
Use
find
to compare ACLs of multiple files recursively:find . -type f -exec acl_cmp -c {} /reference_file \;
-
Pipe the output of
acl_cmp
to other commands for further processing:acl_cmp file1 file2 | grep -E '(different|invalid)'
Related Commands
- getfacl
- setfacl
- restorecon