> On Jun 11, 2018, at 4:02 PM, Gordon Messmer <gordon.messmer@xxxxxxxxx> wrote:
>
> On 06/11/2018 05:40 AM, bruce wrote:
>> #-- this doesn't quite work.. as it generates the complete "ls...
>> output" but it does display the cmd and the resulting num of the ls
>> files..
>> (set -x; ls -al /cloud_nfs_parse/austincc*__parse.dat | wc -l )
>
> Bash doesn't have a mode in which it echos a command before expansion and substitution occur, as far as I know. The command you're seeing, with the wildcard expanded, is the command that bash is actually executing.
> _______________________________________________
It’s an option of the builtin set command.
set …
… When options are specified, they set or unset shell attributes. ….
-v Print shell input lines as they are read.
-x After expanding each simple command, for command, case command, select command, or arithmetic for command, display the expanded value
Alternatively:
set -o option-name
verbose Same as -v.
xtrace Same as -x.
See the bash man page for all set command options (and loads of other info).
Note that:
* using + rather than - causes these options to be turned off.
* the options can be specified when invoking the shell. For example in Bruce’s script, we could use:
#!/bin/sh -v
OR
#!/bin/sh -x
OR
#!/bin/sh -xv
etc
Bev in TX
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