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For 2023 (and 2024 ...) - we are now fully retired from IT training.
We have made many, many friends over 25 years of teaching about Python, Tcl, Perl, PHP, Lua, Java, C and C++ - and MySQL, Linux and Solaris/SunOS too. Our training notes are now very much out of date, but due to upward compatability most of our examples remain operational and even relevant ad you are welcome to make us if them "as seen" and at your own risk.

Lisa and I (Graham) now live in what was our training centre in Melksham - happy to meet with former delegates here - but do check ahead before coming round. We are far from inactive - rather, enjoying the times that we are retired but still healthy enough in mind and body to be active!

I am also active in many other area and still look after a lot of web sites - you can find an index ((here))
Korn shell - some nuggets

I've presented some Korn Shell Training over the last couple of days ,,, and I cut and pasted a few snippets which I thought might be of interest.

• Korn Shell - looping through a series of outputs from a command

$ for file in `ls`; do
> echo $file
> done
LinuxBasicsAdmin.book.pdf
Sefas.book.pdf
dat_backup
dat_backup2
dat_backup3
filestat
funky
gvar
hello_korn
kornserver.cgi
ksh.book.pdf
ksh.ps
numtee
pippa
script_korn
selk
sharon
stroppy
townline
tracey
$


• Korn shell - integer (counting) loop

$ for (( kay=0 ; $kay<10 ; kay=$kay+1 )) ; do
> echo $kay
> done;
0
1
2
3
4
5
6
7
8
9
$


• there are a lot of clever modifiers in the Korn shell you can use on variables such as these which will let you look at part of a string.

$ stwing="jhkasdhjkasdhjkadshjkasdtqwetyuqwe678678sdhjksdhjkasd"
$ print ${stwing:40}
sdhjksdhjkasd
$ print ${stwing:40:5}
sdhjk
$


• using read to read from stdin in ksh, including a prompt.

$ read treacle?pie
pieCustard
$ echo $treacle
Custard
$


• capturing STDERR into a variable in the Korn Shell

$ tryme=`mkdir 2008-05-29 2>&1`
$ echo $tryme
mkdir: cannot create directory `2008-05-29': File exists
$


• branching on the status returned by a command in the Korn Shell

if mkdir 2008-05-29
then
echo yay
else
echo nay
fi


See also Korn Shell Training and Korn Shell Resource Index.

Look back at the previous entries on this blog so see examples of environment settings in the Korn Shell, and also how variables may be used for Strings, Integers and as arrays.
(written 2008-05-30)

 
Associated topics are indexed as below, or enter http://melksh.am/nnnn for individual articles
A172 - Web Application Deployment - Korn Shell - interactive and programming facilities
  [1361] Korn shell course - (2007-09-22)
  [1364] Korn shell course - resources - (2007-09-24)
  [1365] Korn Shell scripts on the web - (2007-09-25)
  [1367] korn tips - some useful korn shell techniques - (2007-09-25)
  [1658] Some useful variables and settings in the Korn Shell - (2008-05-30)
  [1659] String, Integer, Array, Associative Array - ksh variables - (2008-05-30)


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