UNIX shell question

pheno

Hi, I'm new here and I'm not sure if I posted this thread in the right place, so excuse me if I did.

Anyway, I am studying for my exams, UNIX shells, to be specific, and came across a question which I don't understand.

It goes...

"The Unix shell is a widely used interface to Unix systems"
"Name any one specific implementation of the Unix shell"


So the above is the question I am having trouble with?
Can anybody help?

Thanks in advance.

Skrynesaver

Which shell do you use most often and what do you like about it?

There are shells whose features emphasise scripting, shells which emphasise user interaction, nost are Posix compliant and then have layered featuresd on to of that.

Bald? er, dash!

Seems to be looking for the name of a Unix shell, e.g.
sh - Bourne shell
bash - Bourne again shell
ash
Ksh
Zsh
and so on...

Some reading for you here: http://en.wikipedia.org/wiki/Unix_shell

pheno

Bald? er, dash! wrote: »

Seems to be looking for the name of a Unix shell, e.g.
sh - Bourne shell
bash - Bourne again shell
ash
Ksh
Zsh
and so on...

Some reading for you here: http://en.wikipedia.org/wiki/Unix_shell

That's what I was looking for. Thanks.

pheno

How do you list all running BASH processes? I know that ps lists all processes, but how do you list running bash processes?


Thanks.

Skrynesaver

ps lists the processes in the current shell not all processes on the host with no options.

'ps -ef | grep bash' lists the instances of bash running

pheno

Skrynesaver wrote: »

ps lists the processes in the current shell not all processes on the host with no options.

'ps -ef | grep bash' lists the instances of bash running

So ps -ef | grep bash lists all running bash processes?

Thanks for the help.

lemon_remon

pheno wrote: »

So ps -ef | grep bash lists all running bash processes?

Thanks for the help.

It would make a lot more sense if you installed a Unix like (Linux) system and tried it for yourself... you might actually learn something.

pheno

lemon_remon wrote: »

It would make a lot more sense if you installed a Unix like (Linux) system and tried it for yourself... you might actually learn something.

I have Ubuntu installed, however, for some reason I am limited as to what commands I can use. For example, I cannot remove files. (rm)

jester77

pheno wrote: »

I have Ubuntu installed, however, for some reason I am limited as to what commands I can use. For example, I cannot remove files. (rm)

You are trying to delete a file that you don't have permissions for. Read up about file/group permissions (rwx for oug) and how the chown, chgrp and chmod commands work. That alone should give you a good understanding of the file system.

ChRoMe

pheno wrote: »

I have Ubuntu installed, however, for some reason I am limited as to what commands I can use. For example, I cannot remove files. (rm)

Read up about the sudo command and how the root user works.

PrzemoF

pheno wrote: »

I have Ubuntu installed, however, for some reason I am limited as to what commands I can use. For example, I cannot remove files. (rm)

Example with command line output or it never happened!
Maybe you tried to:
- remove directory
- remove file that doesn't belong to you
- remove a file that you don't have permission to remove

I'd suggest _not_ to use sudo unless you know what you're doing.