12-26-2019
Apologies for any typos.
Quote:
Originally Posted by
zxmaus
I pass on this one. My brain is not made for programming. Though I think I can handle pretty much everything else pretty well, and I am now nearing 34 years working in various fields in IT, I just pass on scripting on everything longer than a very long one-liner. Not for lack of trying. I do understand scripts in various scripting languages well enough to debug them, to adjust them to my needs and to expand them if necessary. But I could not write one on my own if my life depends on it. Does this make me dumb?
No it doesn't make you dumb, it means you have not found your niche to create an "_app'_" to take on and maybe even excel at compared to your peers.
It also means that you probably have much more activity in other fields in your private life which would make you think a lot.
I found mine in the late 90s:
My programming niche...
This started me on the road to my multi language learning.
I hadn't ever seen a shell script until joining this site in January 2013 so I jumped in at the deep end bragging with an AudioScope.sh, a SINGLE "bash" script which has, and is, still being gently followed.
I deliberately placed limits on it and the biggest one was the I/O. ONLY the mic and ear are allowed for input and output. USB, Parallel, Serial and others are NOT allowed.
These had to deliver DC as well as AC components on input and output. I got a tremendous amount of help from the big guns on here and from these beginnings I have done some really strange things and most are POSIX compliant:
A DFT in a PURE ksh93 shell script.
A GOTO function.
A Fixed Point SQRT using integer maths.
And much more, all on this site. Most have been bettered by my peers who still know much more than I do about UNIX scripting.
Why?
As a pure learning task to see if it is possible and nothing more.
I am working on a POSIX compliant DFT using integer arithmetic ATM and it is seriously tough. I don't expect it to work but I do have a natural ability to think laterally/orthogonally hence my bizarre uploads to this site.
So GO FOR IT, even if it is something like a CrossStitch Program or calculating the minimum area for a _mains_ cable carrying large current loads.
You would be surprised what you learn by taking on such a task.
This User Gave Thanks to wisecracker For This Post:
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LKSH(1) BSD General Commands Manual LKSH(1)
NAME
lksh -- Legacy Korn shell built on mksh
SYNOPSIS
lksh [-+abCefhiklmnprUuvXx] [-+o opt] [-c string | -s | file [args ...]]
DESCRIPTION
lksh is a command interpreter intended exclusive for running legacy shell scripts. It is built on mksh; refer to its manual page for details
on the scripting language.
LEGACY MODE
lksh has the following differences from mksh:
o lksh is not suitable for use as /bin/sh.
o There is no explicit support for interactive use, nor any command line editing code. Hence, lksh is not suitable as a user's login
shell, either; use mksh instead.
o The KSH_VERSION string identifies lksh as ``LEGACY KSH'' instead of ``MIRBSD KSH''.
o Some mksh specific extensions are missing; specifically, the -T command-line option.
o lksh always uses traditional mode for constructs like:
$ set -- $(getopt ab:c "$@")
$ echo $?
POSIX mandates this to show 0, but traditional mode passes through the errorlevel from the getopt(1) command.
o lksh, unlike AT&T UNIX ksh, does not keep file descriptors > 2 private.
o lksh parses leading-zero numbers as octal (base 8).
o Integers use the host C environment's long type, not int32_t. Unsigned arithmetic is done using unsigned long, not uint32_t. Neither
value limits nor wraparound is guaranteed. Dividing the largest negative number by -1 is Undefined Behaviour (but might work on 32-bit
and 64-bit long types).
o lksh only offers the traditional ten file descriptors to scripts.
SEE ALSO
mksh(1)
https://www.mirbsd.org/mksh.htm
https://www.mirbsd.org/ksh-chan.htm
CAVEATS
lksh tries to make a cross between a legacy bourne/posix compatibl-ish shell and a legacy pdksh-alike but ``legacy'' is not exactly speci-
fied. Parsing numbers with leading zero digits or ``0x'' is relatively recent in all pdksh derivates, but supported here for completeness.
It might make sense to make this a run-time option, but that might also be overkill.
The set built-in command does not have all options one would expect from a full-blown mksh or pdksh.
Talk to the MirOS development team using the mailing list at <miros-mksh@mirbsd.org> or the #!/bin/mksh (or #ksh) IRC channel at
irc.freenode.net (Port 6697 SSL, 6667 unencrypted) if you need any further quirks or assistance, and consider migrating your legacy scripts
to work with mksh instead of requiring lksh.
MirBSD February 11, 2013 MirBSD