Bourn Shell -n Flag Questions
kdk at daleco.biz
Sat Apr 29 00:41:01 UTC 2006
> On 4/28/06, Martin McCormick <martin at dc.cis.okstate.edu> wrote:
>> I read about the noexecute flag or -n flag which is supposed
>> to check the syntax of a Bourn Shell script to see what it would do if
>> run, but not actually do anything. This sounds like a wonderful
>> thing, especially when one is going to run a dangerous script and you
>> only get one chance to get it right.
>> I tried sh -n scriptname and it always silently succeeds even
>> if I type sh -x -n somescript. I even deliberately created a script
>> with a syntax error in it and tried sh -x -n again. It still did
>> nothing but exit. Does this just not work or am I misunderstanding
>> the purpose of the flag?
>> Thanks for your help.
N. Ersen SISECI wrote:
> Bourne shell is bash. So you should try
> bash -n scriptname
Um, "Bourne shell" is /bin/sh. "Bourne Again SHell" is bash, which is
not installed in FreeBSD by default.
As for "sh -n", consider:
 Fri 28.Apr.2006 19:35:03
[kadmin at archangel][~/scripts]# cat foobaz
$ECHO $PRE > $TARGET
 Fri 28.Apr.2006 19:35:20
[kadmin at archangel][~/scripts]# sh -n foobaz
foobaz: 3: Syntax error: Unterminated quoted string
So, it would appear that "-n" is merely a "lint" type option or "syntax
checker". Whether or not it's smart enough to catch your error I can't
tell; it caught mine with and without "-x" ....
The giraffe you thought you offended last week is willing to be nuzzled
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