I use bash shell at my home,but I use ksh at office. But most of the IT organizations use korn shell for scripting and other unix related activities, even if every facilities of ksh are also available in bash.
Could anyone please explain why it organizations prefer korn shell instead of bash shell. Thanks!
Could anyone please explain why it organizations prefer korn shell instead of bash shell. Thanks!
OK, just one of the most annoying differences.
Suppose the following command lines, which could also be part of a script:
What is the content of "$x" after the loop? I every programming language i know (and ksh as well) it is "a b c". In bash it will be "" (empty string), because the content of "$x" is somewhat local to the code block. Notice the difference in the first "echo $x" and the last line.
Of course it would be possible to prevent this by replacing the pipeline with a redirection:
but i would like my while-loops not to be steered at the bottom. It is just hard to read if the loop is longer and you have to go three pages down to find out what is fed into the loop, then go back up to see what is done with the input.
even if every facilities of ksh are also available in bash.
This is incorrect, ksh has several features bash doesn't implement (and reciprocally). Some I'm missing in bash are:
- co-processes
- FPATH
- floating-point arithmetic (ksh93)
- discipline functions (ksh93)
Also, I find very annoying how command history is handled in bash.
Quote:
Could anyone please explain why it organizations prefer korn shell instead of bash shell.
A mixture of cleverness, pragmatism and inertia ...
---------- Post updated at 15:17 ---------- Previous update was at 14:50 ----------
Quote:
Originally Posted by bakunin
...
Instead of
which makes a syntax errror, you probably want:
or
or even better because portable (POSIX):
While I share your opinion about the unfortunate bash implementation choice regarding the pipeline subshell, I have to admit ksh behavior is not guaranteed by POSIX, it is just an accepted extension. Portable scripts shouldn't rely on it.
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I get tired of hearing ksh being called "portable" when it's available almost nowhere I go unless I install it myself, and people keep banging their heads on ancient versions which have almost none of the features people like so much about ksh.
If you want shell code to be portable and available, program for neither bash nor ksh, which contain mutually exclusive features, and neither are available everywhere. Program for posix SH.
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