topic Re: how to view the commented line in vi file in Operating System - HP-UX

how to view the commented line in vi file

rajesh73 — Fri, 10 Jun 2011 02:37:07 GMT

pls find the below vi file.

example:
vi sudoers
1.# Cmnd alias specification
2.STORE /usr/sbin/frestore, /usr/sbin/backup
3.UMOUNT = /usr/sbin/umount
4.MOUNT = /usr/sbin/mount
5.# Host alias specification

the above example i want to view the line number 2,3,4 .because i want to see the uncommented line in the vi file

pls help me

Re: how to view the commented line in vi file

Steven Schweda — Fri, 10 Jun 2011 03:42:59 GMT

> how to view the commented line in vi file

What is "vi file"? A plain-old text file
which was created by "vi"?

> [...] i want to view [...]

Can't you see them now?

Do you mean something like this?:

alp$ grep -v '^#' 1483561.txt
STORE /usr/sbin/frestore, /usr/sbin/backup
UMOUNT = /usr/sbin/umount
MOUNT = /usr/sbin/mount

man grep

Re: how to view the commented line in vi file

rajesh73 — Fri, 10 Jun 2011 04:36:23 GMT

hi thanks for your replay .

my request is

in this sudoers file ,i want to view only uncommneted line, how to view

Re: how to view the commented line in vi file

g3jza — Fri, 10 Jun 2011 04:44:35 GMT

#grep -v '#' /etc/sudoers

Re: how to view the commented line in vi file

rajesh73 — Fri, 10 Jun 2011 04:55:43 GMT

thanks for replay.

Re: how to view the commented line in vi file

Steven Schweda — Fri, 10 Jun 2011 05:46:59 GMT

> #grep -v '#' [...]

Ok, if you want to reject any line with a "#"
in it anywhere. '^#' is a little more
selective.

> [...] only uncommneted line [...]

Define "uncommneted line". Is
/util/search.sh '###' > /tmp/fred.out
an "uncommneted line"?

Everything's complicated, and a vague problem
statement can lead to a sloppy "solution".

> Jun 10, 2011 04:42:59 GMT 8 pts

What? Did I use the wrong file name?

Re: how to view the commented line in vi file

g3jza — Fri, 10 Jun 2011 06:43:15 GMT

Steven:
I haven't seen any standard unix configuration files, which would NOT have the '#' at the beginning of the line :) , that's why I'm always using -v '#' .

Re: how to view the commented line in vi file

Steven Schweda — Fri, 10 Jun 2011 11:01:21 GMT

> I haven't seen any standard unix
> configuration files, which would NOT have
> the '#' at the beginning of the line :) ,
> that's why I'm always using -v '#' .

The original question said "vi file"
(whatever that means), not "standard unix
configuration files". However, let's look at
the example of "sudoers". I'm not a big sudo
user, so I know nothing, but a quick Google
search found some documentation which
suggests that "sudoers" might contain
notation like, say,
#include /etc/sudoers.local
which would make this task a little more
chancy. Also, it appears that one is allowed
to use "#" to add a comment to the end of a
normal line, and it seems to be a part of the
"sudoers" syntax, as in "#uid" or "%#gid".

So, discarding any line which contains "#"
anywhere would seem in this example to risk
losing considerable useful information.

If you would like to expand "^#" to include
white space before "#" (and/or "#include" at
the beginning of a line), then I wouldn't
complain.

> Everything's complicated, [...]

A simple solution to a problem is normally
better than a more complicated one, unless
that simpler "solution" doesn't actually
solve the problem. (Of course, having a
clear and complete definition of the problem
is helpful, but this is often difficult to
obtain.)

Re: how to view the commented line in vi file

點燃 — Fri, 10 Jun 2011 13:14:01 GMT

saludos,

Do a grep -v for all lines starts with # which can be identified using "^#" in the output of the cat command.

cat /etc/sudoers |grep -v "^#"

All lines starts with a # will be eliminated in the output.

todo lo mejor

Re: how to view the commented line in vi file

Steven Schweda — Fri, 10 Jun 2011 16:53:26 GMT

> cat /etc/sudoers |grep -v "^#"

Why didn't _I_ think of that? No, wait...

Note that the "cat" is not needed.

Re: how to view the commented line in vi file

Hiren N Dave — Sat, 11 Jun 2011 04:07:48 GMT

#grep -v '#' /etc/sudoers

Re: how to view the commented line in vi file

Steven Schweda — Sat, 11 Jun 2011 05:44:49 GMT

Hiren N Dave> #grep -v '#' /etc/sudoers

Have you considered the benefits of reading
the previous replies before duplicating one
of them?

Re: how to view the commented line in vi file

Hiren N Dave — Sat, 11 Jun 2011 06:54:43 GMT

Yes, you are right. The credit should go to g3jza.

Re: how to view the commented line in vi file

g3jza — Sat, 11 Jun 2011 09:11:58 GMT

well, actually the credit should go to Steven, he got the most complete solution

Re: how to view the commented line in vi file

Bill Hassell — Sat, 11 Jun 2011 22:46:24 GMT

This is probably the most complete and simplest answer:

awk NF /etc/sudoers | grep -v ^[[:space:]]*#

This removes all blank or space-only lines and any line that has # as the first non-space character on the line. (non-space really means white space which includes tabs).

Since it is very common to want non-comment lines filtered out of config files, I wrote the NOcomment script (attached).

Re: how to view the commented line in vi file

Steven Schweda — Sun, 12 Jun 2011 03:38:34 GMT

> This is probably the most complete and
> simplest answer:
> [...]

Define "probably" (or "simplest").

With one program ("grep") instead of two:

alp$ grep -E -v '^[[:space:]]*#|^[[:space:]]*$' 1483561.txt
STORE /usr/sbin/frestore, /usr/sbin/backup
UMOUNT = /usr/sbin/umount
MOUNT = /usr/sbin/mount

alp$ cat 1483561.txt
# Cmnd alias specification
STORE /usr/sbin/frestore, /usr/sbin/backup
UMOUNT = /usr/sbin/umount

# Comment with leading space.
MOUNT = /usr/sbin/mount

# Host alias specification

Re: how to view the commented line in vi file

James R. Ferguson — Sun, 12 Jun 2011 11:50:28 GMT

Hi:

Instead of *two* processes as in:

# awk NF /etc/sudoers | grep -v ^[[:space:]]*#

...do it all with *one* process:

# awk 'NF && ! /^[[:space:]]*#/' /etc/sudoers

Regards!

...JRF...

Re: how to view the commented line in vi file

Bill Hassell — Sun, 12 Jun 2011 19:28:46 GMT

Or create an alias so you have a new command:

alias NOcomment="awk 'NF && ! /^[[:space:]]*#/'"

Works with one or more files as well as stdin.
Thanks JRF