Re: [LTP] Heads up: bash v1 vs bash v2

[Sean C. <ch...@su...>]

Everything I run ltp on uses bash 1.x as the default shell.  Changing that is not a possibility, which means that I have to update all of these files for 1.x compatability.

I speculate it would be more useful to most people if ltp only relied on bash 1.x functionality. My suggestion would be to use `expr $foo + $bar` (with backquotes), rather than the new bash/ksh style expressions.

I've been chasing this around with LTP for a week now, so the list of files is helpful; thanks.
$.02
-s

Nathan Straz wrote:
> 
> This is just a heads up warning to those people running distributions
> that don't include bash 2.x yet.
> 
> Many of the scripts in LTP include some Korn shell expressions which
> bash 1.x does not understand but bash 2.x does.  I've received a few
> inquires from people running Red Hat 6.x about scripts failing.  Here is
> what is going on.
> 
> Differences that affect LTP
> ===========================
> 
> * Arithmetic expressions using (( ))
> 
> There are some scripts that feel the need to do some math and they use
> this form.  For example:
> 
> ltctests/nfs/nfs02/generate.sh
> 
> ...
> do
>   while [ $COUNT -le $LIMIT ]
>   do
>     echo -n "AAAAAAAAAA" >> dat/$the_file
>     (( COUNT = COUNT + 1 ))
>   done
>   (( LIMIT = LIMIT * 12 ))
> ...
> 
> The bash 1.x way of doing this would be:
> ...
> do
>   while [ $COUNT -le $LIMIT ]
>   do
>     echo -n "AAAAAAAAAA" >> dat/$the_file
>     let "COUNT = COUNT + 1"
>   done
>   let "LIMIT = LIMIT * 12"
> ...
> 
> * tests using [[ ]]
> 
> This is a special test that includes support for pattern matching.  Many
> Korn shell scripters will use this everywhere.  It most cases, you can
> use [ ] instead.  I'm not sure to make the pattern globbing work well in
> bash 1.x.
> 
> Which version of bash are you running?
> ======================================
> 
> So how do you figure out which version of bash you're running?  It's
> pretty easy and there are many ways to find out.
> 
> # bash --version
> # bash -c 'echo $BASH_VERSION'
> # rpm -q bash
> 
> Which files are affected?
> =========================
> 
> Here is a rough list of which files in LTP may give bash 1.x users
> trouble.
> 
> doio/rwtest.sh
> ltctests/ade/ar/ar01
> ltctests/ade/ld/ld01
> ltctests/ade/nm/nm01
> ltctests/fs/fs_inod/fs_inod
> ltctests/io/stress_floppy/generate.sh
> ltctests/multicast/mc_commo/mc_commo
> ltctests/multicast/mc_opts/mc_opts
> ltctests/nfs/nfs02/nfs02
> ltctests/nfs/nfs02/generate.sh
> ltctests/nfs/nfsstat01/nfsstat01
> ltctests/rpc/rpcinfo/rpcinfo01
> ltctests/tcp_cmds/arp/arp01
> ltctests/tcp_cmds/echo/echo01
> ltctests/tcp_cmds/finger/finger01
> ltctests/tcp_cmds/ftp/generate.sh
> ltctests/tcp_cmds/host/host01
> ltctests/tcp_cmds/netstat/netstat01
> ltctests/tcp_cmds/perf_lan/perf_lan
> ltctests/tcp_cmds/ping/ping
> ltctests/tcp_cmds/ping/ping01
> ltctests/tcp_cmds/rcp/generate.sh
> ltctests/tcp_cmds/rcp/rcp01
> ltctests/tcp_cmds/rdist/generate.sh
> ltctests/tcp_cmds/rdist/rdist01
> ltctests/tcp_cmds/rsh/rsh01
> ltctests/tcp_cmds/rwho/rwho01
> ltctests/tcp_cmds/sendfile/generate.sh
> ltctests/tcp_cmds/sendfile/sendfile01
> ltctests/tcp_cmds/tcpdump/tcpdump01
> 
> --
> Nate Straz                                              ns...@sg...
> sgi, inc                                           http://www.sgi.com/
> Linux Test Project                                  http://ltp.sf.net/
> 
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