20299860: zdiff unix utility expects BSD Bourne shell, not GNU BASH.

[openradar-mirror]

Description

Summary:
Running the built in zdiff unix utility to compare the difference between two compressed files fails.

Steps to Reproduce:

1. Create a text file. (e.g. run echo "Hello, World!" > example.txt from Terminal.app)
2. Compress that text file with the unix utility gzip, keeping the original. (e.g. run gzip --keep --stdout example.txt > a.gz from Terminal.app)
3. Alter the text file (e.g. run echo "Goodbye, World :(" > example.txt from Terminal.app)
4. Again, compress the text file with the same utility as in step 2, changing the filename (e.g. run gzip --keep --stdout example.txt > b.gz from Terminal.app)
5. Run the command zdiff a.gz b.gz

Expected Results:
The terminal should print the differences between the two compressed text files.

Actual Results:
The terminal fails with a number of errors:

[howard@int-osx-prod1 ~]% zdiff ~/production.sql.gz ~/development.sql.gz
/usr/bin/zdiff: line 49: setvar: command not found
/usr/bin/zdiff: line 50: setvar: command not found
/usr/bin/zdiff: line 49: setvar: command not found
/usr/bin/zdiff: line 50: setvar: command not found

Version:
Mac OS X Yosemite 10.10.2 (14C1514)

Darwin int-osx-prod1 14.1.0 Darwin Kernel Version 14.1.0: Thu Feb 26 19:26:47 PST 2015; root:xnu-2782.10.73~1/RELEASE_X86_64 x86_64

Notes:
Running the same test on a FreeBSD server returns the expected results.

[howard@ext-bsd-a13 ~]> uname -a
FreeBSD ext-bsd-a13.hplogsdon.net 9.3-STABLE FreeBSD 9.3-STABLE #1 r277307: Sat Jan 17 19:11:50 MST 2015 root@int-fbsd-build.hplogsdon.net:/usr/obj/usr/src/sys/HPLOGSDON_NET i386
[howard@ext-bsd-a13 ~]> echo "Hello, World!" > example.txt
[howard@ext-bsd-a13 ~]> gzip -k -c example.txt > a.gz
[howard@ext-bsd-a13 ~]> echo "Goodbye, World :(" > example.txt
[howard@ext-bsd-a13 ~]> gzip -k -c example.txt > b.gz
[howard@ext-bsd-a13 ~]> zdiff ~/a.gz ~/b.gz
1c1

< Hello, World!

Goodbye, World :(

the shell /bin/sh on OS X, is a link to /bin/bash, the GNU Bourne Again Shell (GNU Bash-3.2). On FreeBSD /bin/sh's manpage states that it's version is the rewritten version modeled after Bourne shell from AT&T System V Release 4 UNIX. FreeBSD's sh manpage reference a "setvar" command, where as GNU's BASH does not.

Configuration:

Attachments:

Product Version: 10.10.2 (14C1514)
Created: 2015-03-25T22:21:31.920541
Originated: 2015-03-25T00:00:00
Open Radar Link: http://www.openradar.me/20299860