On 21 May 2023 at 13:42, Tim wrote:
Subject:         Re: Strange error running scripts. without #!/usr/bin/bash
From:            Tim <ignored_mailbox@yahoo.com.au>
To:              mikes@guam.net, Community support for Fedora users
  <users@lists.fedoraproject.org>
Date sent:       Sun, 21 May 2023 13:42:59 +0930
> On Sun, 2023-05-21 at 12:17 +1000, Michael D. Setzer II wrote:
> > Recently was getting a strange error when running a script that
> > didn't have #!/usr/bin/bash at top?
> >
> > free(): invalid next size (fast)
> > Aborted (core dumped)
> >
> > Just adding the line fixes the issue, but not sure why??
> > Have run the script before with no such error, but had been a while?
> > Script was just one line? Now 2 lines.
> >
> >
> > #!/usr/bin/bash
> > boincmgr -e /home/msetzerii/BOINC -d /home/msetzerii/BOINC
>
> A different default shell?
Not that I can see.
SHELL variable is a little different
SHELL=/bin/bash
ls -l | grep bin
lrwxrwxrwx.   1 root root            7 Aug  9  2022 bin -> usr/bin
lrwxrwxrwx.   1 root root            8 Aug  9  2022 sbin -> usr/sbin
$ ls -l  /usr/ | grep bin
dr-xr-xr-x.   4 root root 163840 May 20 22:50 bin
dr-xr-xr-x.   2 root root  36864 May 19 23:22 sbin
And sh is
ls -l /usr/bin/sh
lrwxrwxrwx. 1 root root 4 Jan  2 21:47 /usr/bin/sh -> bash
Not sure why SHELL is /bin/bash instead of /usr/bin/bash but both are the exact same file??
Even stranger, was going to see if using strace would show something, but right now ran a copy of script without line, and it runs fine without the error??
> --
> uname -rsvp
> Linux 3.10.0-1160.90.1.el7.x86_64 #1 SMP Thu May 4 15:21:22 UTC 2023 x86_64
> Boilerplate:  All unexpected mail to my mailbox is automatically deleted.
> I will only get to see the messages that are posted to the mailing list.
>
+------------------------------------------------------------+
 Michael D. Setzer II - Computer Science Instructor (Retired)    
 mailto:mikes@guam.net                           
 mailto:msetzerii@gmail.com
 Guam - Where America's Day Begins                       
 G4L Disk Imaging Project maintainer
 http://sourceforge.net/projects/g4l/
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