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Full Discussion: Weird behavior of command "local"
Top Forums Shell Programming and Scripting Weird behavior of command "local" Post 302960977 by chebarbudo on Sunday 22nd of November 2015 06:39:38 PM
Old 11-22-2015
Weird behavior of command "local"
Hi there,

I'm running into a very weird situation. Let's forget about the purpose of my initial script please. I noticed the bug whatever I'm trying to do.

I'm on an old server running bash 3.1.17.

Say we have the following script :
Code:
foo:~# cat /tmp/test
#!/bin/bash
f1() {
        local var
        echo "var is ${var+set}"
}
f2() {
        echo "var is ${var+set}"
}
f1
f2

When I execute it, I get the following result:
Code:
foo:~# bash /tmp/test
var is set
var is

Meaning that the command "local" makes the variable be set even if no value was given to it. This is not the behavior I've seen on any other server.

Can anyone explain what's going on?

Thanks
Santiago

---------- Post updated at 00:39 ---------- Previous update was at 00:19 ----------

I tested my little script on several servers and got the following results :
Code:
bash-3.1.17: var is set
bash-3.2.39: var is set
bash-4.1.5:  var is
bash-4.2.37: var is
bash-4.3.30: var is

Is this a bug of bash-3.x?
Am I not expecting the right behavior from "local" command?
Thanks for your help

Santiago
Last edited by Franklin52; 11-23-2015 at 10:47 AM.. Reason: Adding code tags
 

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LEARN ABOUT DEBIAN

snnewgroup

snnewgroup.v0.3.8(8)					      System Manager's Manual					      snnewgroup.v0.3.8(8)

NAME

       snnewgroup - create a new sn newsgroup

SYNOPSIS

       snnewgroup newsgroup [server] [port]

DESCRIPTION

       snnewgroup creates newsgroup assigning it an upstream NNTP server of server:port.  If port is not specified, defaults to 119.  If server is
       also not specified, newsgroup is created as a local group which is fed only by articles POSTed to it.

       You will need to be root or own /var/spool/sn in order to add new groups.

ENVIRONMENT VARIABLES

       SNROOT If this is set and is not empty, the value is used in place of /var/spool/sn, the default news spool directory.

FILES CREATED

       /var/spool/sn/newsgroup
	      Directory where articles will be stored.

       /var/spool/sn/newsgroup/.created
	      Empty file for the newsgroup creation time.

       /var/spool/sn/newsgroup/.serial
	      Where snget gets its idea of the new starting serial number for newsgroup on server server:port.	The value is initialized to 0.

       /var/spool/sn/newsgroup/.outgoing
	      If server is specified, is a symlink to  /var/spool/sn/.outgoing/server:port, which is a directory, created if it does  not  already
	      exist.  If server is not specified, no file /var/spool/sn/newsgroup/.outgoing will be created.  See also snsend.

SEE ALSO

       sndelgroup, snsend

N.B.								    Harold Tay						      snnewgroup.v0.3.8(8)
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