On 21 May 2023 at 16:52, Roger Heflin wrote:
From: Roger Heflin <rogerheflin@xxxxxxxxx>
Date sent: Sun, 21 May 2023 16:52:56 -0500
Subject: Re: Strange error running scripts. without
#!/usr/bin/bash
To: Community support for Fedora users
<users@xxxxxxxxxxxxxxxxxxxxxxx>
Send reply to: Community support for Fedora
users <users@xxxxxxxxxxxxxxxxxxxxxxx>
> You should be able to add -f (follow all forks) on strace and it will
> follow everything. But without the script tracing POC mentions you
> aren't really going to know what line gets the error.
>
> It is likely the bug is in one of the commands you are using, and it
> may depend on the data you are getting and processing.
>
As a test, I put an echo command at start of program.
echo START
for a in $(ls -1rt status_cgi*); do
n=$(echo "$a" | sed 's/status_cgi.//g;s/status_cgi//g');
html2text -b0 "$a" >text."$n" ;
grep "^Downstream" <text."$n" | sed
's/[[:alpha:]|]//g;s/^ //g;s/ / /g' | cut -f1,4,5,9 -d' '
>down."$n" ;
done
./mktext2x.sh
free(): invalid next size (fast)
Aborted (core dumped)
Never displays START??
The other version prints the Start and runs fine.
#!/usr/bin/bash
echo Start
for a in $(ls -1rt status_cgi*); do
n=$(echo "$a" | sed 's/status_cgi.//g;s/status_cgi//g');
html2text -b0 "$a" >text."$n" ;
grep "^Downstream" <text."$n" | sed
's/[[:alpha:]|]//g;s/^ //g;s/ / /g' | cut -f1,4,5,9 -d' '
>down."$n" ;
done
Everything else is exactly the same.
Currently have status_cgi thru status_cgi.321 so 322
files.
Another simpler test.
cat start1.sh
#!/usr/bin/bash
echo Start
cat start2.sh
echo Start
$ ./start1.sh
Start
$ ./start2.sh
free(): invalid next size (fast)
Aborted (core dumped)
So, nothing but an echo command??
> On Sun, May 21, 2023 at 4:39 PM Patrick O'Callaghan
> <pocallaghan@xxxxxxxxx> wrote:
> >
> > On Mon, 2023-05-22 at 07:09 +1000, Michael D. Setzer II via users
> > wrote:
> > > Located the earlier script. It still gave the error so tried
> > > strace and got
> > > strace ./mktext2x.sh
> > > execve("./mktext2x.sh", ["./mktext2x.sh"],
> > > 0x7ffc37e55570 /* 35 vars */) = -1 ENOEXEC (Exec
> > > format error)
> > > strace: exec: Exec format error
> > > +++ exited with 1 +++
> > > But running the corrected one ran fine as is and with
> > > strace.
> > >
> > > But then tried to run it again, and mktext2x.sh runs
> > > without error?
> > >
> > > Running the one with bash line, strace works fine.
> > > strace ./mktext2.sh
> > > execve("./mktext2.sh", ["./mktext2.sh"], 0x7ffc9afbcb80
> > > /* 63 vars */) = 0
> > > brk(NULL) = 0x55a016794000
> > >
> >
> > AFAIK what you're tracing here is the Shell itself, not the script
> > (except indirectly), which is unlikely to be useful in most cases.
> >
> > You can do some tracing of Shell scripts. See for example
> > https://www.tecmint.com/trace-shell-script-execution-in-linux/
> >
> > poc
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+------------------------------------------------------------+
Michael D. Setzer II - Computer Science Instructor
(Retired)
mailto:mikes@xxxxxxxx
mailto:msetzerii@xxxxxxxxx
Guam - Where America's Day Begins
G4L Disk Imaging Project maintainer
http://sourceforge.net/projects/g4l/
+------------------------------------------------------------+
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