chmod command
Gopal Ghosh
gopal016 at gmail.com
Fri Sep 19 06:43:00 UTC 2008
Dear Kae and Roger,
Thank u so much 4 ur help and support … J
Today I want to share some words with all those fellow Linux devotees…….
But, first let me introduce my self …..
My name is gopal ghosh and I live in new Delhi….
my parent wanted me to become a Railway Ticket Checker at old Delhi railway
station… but
I want to become a computer wizard.. as pictures of computer systems
influenced me so much as a kid… that
Some times in my dreams even I designed few cool mouse and trackball
designs.
and to fulfill my dreams I joined a local computer institute, but after 2
months they throw me out as my questions irritate them
in my view they are unable to satisfy my appetite to learn more…..
still today I feel the same appetite which drives me to learn new things
After this incident I strongly believe in self learning…..
now I am providing support for more than 1400 products from 32 principal
brands (www.adityagroup.com)
my reason for learning Linux is I want to provide tech support for Autodesk
smoke which runs on RHEL
so to learn Linux I am here on this fedora mailing list…….
I know what kind of information is mentioned in man pages to learn a command
FIRST I start with books with few switches and arguments
THEN I go to man pages to test some more switches and arguments , some times
I find it easy to ride through the man pages, but
sometimes I don't.
Each time I learn a new thing I found myself deeply in love with Linux
THANKS to Linux god who created such a nice thing which can perform so many
task in one command…
all that I mentioned here to emphasis the importance of a fair discussion
with out any altercation.
sometimes what I know is accurate for me and wrong for others but that
doesn't mean I fight with them to prove I am right.
i discuss the topic to update myself.
I appreciate ur efforts to help people like me and I also request u not to
involve in any kind of altercation.
here I am submitting my information for CP , CHMOD and command redirection
*command output redirection to file**
**STDIN – 0
STDOUT – 1
STDERR – 2
*> redirect STDOUT to file
>> append STDOUT to pre existing file
2> redirect STDERR to file
2>> append STDERR to existing file
*command < file ** send file as input*
*/dev/null is black hole for data as all inputs are ignored*
* PIPES*
* comman1 *| *command2
*
STDOUT > STDIN
( ) combines STDOUT of multiple programs such as
*(cal2007 ; cal2008) | less*
*&2>&1 redirects STDERR to STDIN*
cat filename.txt
Hello, World!
cat < filename.txtx
Hello, World
*ls **>** list.of.files *– redirect command output to this file
*ls **>>** list.of.files *- append output at the end of file
*command output redirection to another command*
* *
*ls **|** more *
* *
*ls **|** sort
*
*cp command**
*cp is a file & directory copy command
*cp file1 file2 dir*
for /gopal.nano
*cp /gopal.nano gopal2.nano /home*
*cp file1 file2 file3 file4 dir*
*
cp -a copies files and directories recurisvly
cp -p copies content along with permission and time stamp
cp -i interactive mode
cp -f force
**cp –api**
**chmod command*
change mode command
octal: 0 6
4 0
binary: 000 111 111
111
symbolic: sst rwx
rwx rwx
special user
group other
attributes
chmod o=r archive.sh
chmod g= topsecret.inf
chmod og=rw publicity.html
chmod ug=o
chmod g=u info.dat
rwx r-x r-- info.sh
111 101 100
7 5 4
*r-- 100/4
rw- 110/6
rwx 111/7
-w- 010/2
-wx 011/3
--x 001/1*
*chmod 444 gopal.nano*
chmod [OPTION]... MODE[,MODE]... FILE...
chmod [OPTION]... OCTAL-MODE FILE...
chmod [OPTION]... --reference=RFILE FILE...
And finally HOPE u people don't mind me for repeating my questions again
** how to search for a group of files using wildcard and copy the result
content and redirecting it to a dir
** how to use chmod command (in octal mode) for n number of files present in
a
directory
Thanks
Regards
On Thu, Sep 18, 2008 at 5:28 PM, Roger Millington <
roger.millington at tesco.net> wrote:
>
>
> Kae Verens wrote:
> > Roger Millington wrote:
> >> man chmod
> >>
> >
> > that's a bit harsh, Roger! It's possible that maybe Gopal does not
> > understand the man pages.
>
> There is no indication that Gopal has read the 'man' pages or even
> understands that they exist. I would expect that my response(s) will
> invite Gopal's curiosity and that he will investigate this mysterious
> 'man' command.
>
> The alternative is for someone to spend 20 minutes making precis of the
> relevant 'man' pages and posting them.
>
> Roger
>
>
> >
> > example:
> > chmod 750 filename1 filename2
> > first digit is user
> > second digit is group
> > third digit is everyone (world)
> > 7 = allow file owner to read, write, execute
> > 5 = allow members of file's group to read and execute
> > 0 = do not let anyone else use the file
> >
> > the numbers are calculated by adding these up
> > 4 = allowed to read
> > 2 = allowed to write
> > 1 = allowed to execute.
> > so 750 = (4+2+1)(4+1)(0)
> >
> > kae
> >
> >> Gopal Ghosh wrote:
> >>
> >>> Dear all,
> >>> how to use chmod command (in octal mode) for n number of files
> >>> present in a
> >>> directory
> >>> Thanks
> >>> regards
> >>>
> >>>
> >>>
> >>>
> ------------------------------------------------------------------------
> >>>
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> >>> Fedora-laptop-list at redhat.com
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> >>>
> >>
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> >> http://www.redhat.com/mailman/listinfo/fedora-laptop-list
> >>
> >
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