On 11Jun2018 14:02, 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.
The shell has long had a -v option which echoes commands as they are read. Note
that this is in the parse step, so:
- you see the command before expansion
- you see whole compond commands _once_ as they are encountered, not as they
are executed
Personally I like "set -x". I've even got a tiny line script called "set-x"
which goes:
#!/bin/sh
set -x
exec "$@"
and many scripts which do variants on:
trace=
[ -t 2 ] && trace=set-x # at least during development
...
$trace important command here ...
...
For proper utility scripts I tend to add a -x option to explicitly turn it on,
and -n to set it to "eecho", another tiny script which goes:
#!/bin/sh
echo "$*" >&2
which gets you do-nothing tracing mode, 90% of what a -n needs.
Cheers,
Cameron Simpson <cs@xxxxxxxxxx>
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