The Korn shell (ksh) is a shell with advanced scripting features, commonly found on commercial unices and some BSD systems but rarely used on Linux.
18
votes
3answers
2k views
using single or double bracket - bash
I'm confused with using single or double bracket. look at code:
dir="/home/mazimi/VirtualBox VMs"
if [[ -d ${dir} ]]; then
echo "yep"
fi
It works perfectly although the string contains space. ...
63
votes
1answer
9k views
Difference between nohup, disown and &
What is the difference between
$ nohup foo
and
$ foo &
and
$ foo &
$ disown
2
votes
4answers
1k views
Is there a way to sum up the size of files listed?
This is the command I am using to list some files:
find . -name \*.extract.sys -size +1000000c -exec ls -lrt {} \;
-rw-r--r-- 1 qa1wrk15 test 1265190 Sep 29 01:14 ...
7
votes
4answers
876 views
Executing user defined function in a find -exec call
I'm on Solaris 10 and I have tested the following with ksh (88), bash (3.00) and zsh (4.2.1).
The following code doesn't yield any result:
function foo {
echo "Hello World"
}
find somedir -exec ...
5
votes
5answers
337 views
Shell programming, avoiding tempfiles
I often write KSH shell scripts that follow the same pattern:
(1) retrieve output from one or more command
(2) format it using grep|cut|awk|sed and print it to the screen or to a file
In order to ...
4
votes
2answers
1k views
How to get a clean environment in a ksh shell?
I need to get rid of all the environment variables in a Ksh shell. I can fork a new instance, but it will inevitably source some init files (as far as I know .profile, .kshrc). Is there a way to ...
2
votes
2answers
734 views
Bash/Korn shell script edited on Windows throws error '…^M: not found'
Some background on the issue:
I am new to scripting and wrote a simple Bash script in Windows using Notepad++.
cxStopAllServicesOnSERVER.sh
#usr/bin/bash
cd "/some/path"
echo "Hi. Logs can be found ...
0
votes
3answers
66 views
output only file names(with spaces) in ls -Al
I should echo only names of files or directories with this construction:
ls -Al | while read string
do
...
done
ls -Al output :
drwxr-xr-x 12 s162103 studs 12 march 28 12:49 personal ...
22
votes
5answers
1k views
When do you use brace expansion?
I understand what brace expansion is, but I don't know how best to use it.
When do you use it?
Please teach me some convenient and remarkable examples if you have your own tip.
4
votes
1answer
271 views
Ksh loses data after piping 16K bytes
I recently found that ksh may lose some data after printing more than 16K bytes to the stdout if it is blocked for a couple of seconds.
This test.sh script prints out 257*64 (16448) bytes:
...
4
votes
4answers
400 views
A unix command to truncate each line of a file
I have a CSV file and I want to truncate it from the third semicolon. For example, if I have this file:
1;foo;bar;baz;x;y;z
2;foo;bar;baz;x;y;z
3;foo;bar;baz;x;y;z
I want to get the following ...
4
votes
6answers
341 views
What should I do with a remote AIX machine if I accidentally “chmod 644”-ed the “/usr/bin/ksh”?
Now the machine asks for password...The ssh was configured with key auth.. The problem is that ksh doesn't has executable permission anymore.. :\ What can I do remotely? Any tips?
The root's shell ...
19
votes
2answers
646 views
Why escape trivial characters in shell script?
I just opened a legacy shell script (written in old ksh88 on Solaris) and found the following repeated all throughout the code:
[ -f $myfile ] && \rm -f $myfile
The escaping backslash ...
5
votes
1answer
689 views
Korn Shell: End, pgup, pgdown, and delete key not working
So basically my End, Pageup/Pagedown, and Delete key are not working in ksh93. I'm running FreeBSD by the way.
My arrow keys are working, and so is my home key.
Those keys work when I put this in my ...
5
votes
1answer
330 views
Poor Man's GNU Parallel implemented in ksh?
I'd like to use the feature of GNU parallel where it can execute the command and the list it's fed in parallel and spit it out after it's all done, however, I don't want to install GNU parallel across ...
