Explain with suitable examples the facilities provided by any 
widely available named shell of your own choosing  to support:

(a) command substitution    
(b) filename substitution      
(c) shell script production

---

Request for Question Clarification by maniac-ga on 24 Dec 2002 12:49 PST

Hello Vpb,

As mentioned in a comment, command substitution is 'alias'.

Filename substitution is likely more commonly described as "filename
expansion" or globbing, the use of starnames to get a sequence of file
names.

However, do you have a better definition of "shell script production"?
"producing" a shell script is usually done by a person. The only thing
the shell does is to allow you to read a file as a series of commands.

With the clarification I should be able to produce a suitable answer.
  --Maniac

---

Clarification of Question by vpb-ga on 25 Dec 2002 15:26 PST

hi Maniac  Happy Chirstmas                      Question ID: 132835  
 
i haven't got any better definition i think you can choose cat command
you know it will display contents of file and contents of line in the
file so on...
do it your best and easy to under stand that's it  no more complaints 
 
 
                     thank you

I use bash. briefly:

a) command substitution: 'alias'
b) filename substitution: symbolic links. 'ln -s'
c) shell script production: umm... 'vi script.sh' ?

hi

why don't you use ksh, Linux is usually bundled with the 'Bourne again
shell' (bash).so use ksh.


                   thank you

hi Maniac  Happy Chirstmas                      Question ID: 132835 

i haven't got any better definition i think you can choose cat command
you know it will display contents of file and contents of line in the
file so on...
do it your best and easy to under stand that's it  no more complaints


                     thank you

Oh, well, I only use bash because it's there. There may be better
shells out there but I like bash because it's familiar. Even on BSD
machines I set my default shell to bash.

I don't write sh scripts anymore. I write my scripts in perl -- there
are not too many things that i can do with shell scripts that i can't
with perl. Besides, perl replaces sed/awk in one line.

As for filename substitutions, I'm sorry for the boo-boo. ln
-s...pah... what was I thinking?!