Show added, changed, or deleted files based on signatures

Name

acd - show added, changed, or deleted files based on signatures

Synopsis

acd [-acdhmusvw] old new

Options

• -a: Show only added files.
• -c: Show only changed files.
• -d: Show only deleted files.
• -h: Print a brief help message and exit.
• -m: Print the manual page and exit.
• -s: Show only identical files.
• -u: Print the script UUID and exit.
• -v: Print the version and exit.
• -w: Print the canonical source location and exit.

Description

acd reads old and new signature files, which should be the output from "md5sum" or "md5 -r", and prints a list showing which files were added, changed, or deleted.

Actually, any method of hashing a file will do, as long as it prints output in the form "signature \s+ filename". Don't assume the signature is a uniform length; if it contains leading whitespace, print a warning but fix it and continue.

The filename may also contain internal whitespace.

Example

sig.old holds file signatures just after installation. The signatures are just 16-bit CRCs for illustration:

me% cat sig.old
17088 /.cshrc
52314 /.profile
37866 /COPYRIGHT
65498 /bin/[
21849 /bin/cat
64309 /bin/chflags
38258 /bin/chio
26211 /bin/chmod
48631 /bin/cp
49491 /bin/csh
23226 /var/run/dmesg.boot
19047 /var/run/ld.so.hints
33666 /var/run/utmp
37926 /var/yp/Makefile.dist

sig.new holds signatures for a production system that's had lots of files added, deleted, tweaked, etc.

me% cat sig.new
17088 /.cshrc
67890 /.profile
37866 /COPYRIGHT
65498 /bin/[
21849 /bin/cat
64309 /bin/chflags
38258 /bin/chio
26211 /bin/chmod
48631 /bin/cp
49491 /bin/csh
54701 /usr/src/usr.sbin/zic/zdump.8
25531 /usr/src/usr.sbin/zic/zdump.c
24133 /usr/src/usr.sbin/zic/zic.8
64165 /usr/src/usr.sbin/zic/zic.c

We've removed some /var/run files and added some /usr/src files. We've also changed root's .profile:

me% acd sig.old sig.new
A /usr/src/usr.sbin/zic/zdump.8
A /usr/src/usr.sbin/zic/zdump.c
A /usr/src/usr.sbin/zic/zic.8
A /usr/src/usr.sbin/zic/zic.c
C /.profile
D /var/run/dmesg.boot
D /var/run/ld.so.hints
D /var/run/utmp
D /var/yp/Makefile.dist

Just the files on the old system that aren't on the new one:

me% acd -a sig.old sig.new
/usr/src/usr.sbin/zic/zdump.8
/usr/src/usr.sbin/zic/zdump.c
/usr/src/usr.sbin/zic/zic.8
/usr/src/usr.sbin/zic/zic.c

Just the changed files:

me% acd -c sig.old sig.new
/.profile

Just the files on the old system that we've deleted:

me% acd -d sig.old sig.new
/var/run/dmesg.boot
/var/run/ld.so.hints
/var/run/utmp
/var/yp/Makefile.dist

Identical files:

me% acd -s sig.old sig.new
/.cshrc
/COPYRIGHT
/bin/[
/bin/cat
/bin/chflags
/bin/chio
/bin/chmod
/bin/cp
/bin/csh

Added and changed files:

me% acd -ac sig.old sig.new
A /usr/src/usr.sbin/zic/zdump.8
A /usr/src/usr.sbin/zic/zdump.c
A /usr/src/usr.sbin/zic/zic.8
A /usr/src/usr.sbin/zic/zic.c
C /.profile

Everything, including identical files:

me% acd -acds sig.old sig.new
A /usr/src/usr.sbin/zic/zdump.8
A /usr/src/usr.sbin/zic/zdump.c
A /usr/src/usr.sbin/zic/zic.8
A /usr/src/usr.sbin/zic/zic.c
S /.cshrc
C /.profile
S /COPYRIGHT
S /bin/[
S /bin/cat
S /bin/chflags
S /bin/chio
S /bin/chmod
S /bin/cp
S /bin/csh
D /var/run/dmesg.boot
D /var/run/ld.so.hints
D /var/run/utmp
D /var/yp/Makefile.dist

Author

Comments welcome.