01-08-2008
Quote:
Originally Posted by
detective linux
i open terminal and join as root
and i wrote ln -s blah blah
then i wrote ls
i see red file called blah blah
but didn't understand what is this can some one explain and is this the way to read it ?
This should fail if blah already exists. If blah is a directory it will create the link in the directory.
Quote:
Originally Posted by
detective linux
what if remove the orginal file of hard link can i still see the content of the file
if its the last reference to the file then the file will be removed.
Quote:
Originally Posted by
detective linux
and can i try to make a hard link to a directory ? To a non-existent file
no
Quote:
Originally Posted by
detective linux
another more questions hope not one get angry coze i ask much
what if i try to change the permissions of the original file with chmod, or update its modification time with touch is there is something gunna happen for the links
the links all point to the same file so updating the permissions will appear like all links were changed. you cannot however change the permissions of a symbolic link.
10 More Discussions You Might Find Interesting
1. UNIX for Advanced & Expert Users
Hi all!
I'd like to know the differences between hard links and soft links. I've already read the ln manpage, but i'm not quite sure of what i understood.
Does a hard link sort of copy the file to a new name, give it the same inode number and same rights?
What exactly should I do to do this:... (3 Replies)
Discussion started by: penguin-friend
3 Replies
2. UNIX for Dummies Questions & Answers
question abt symbolic link ...
i'm doing the following ...
ln -s x.sh ./scripts/y.sh
and
cat ./scripts/y.sh
it is giving following error
cat: cannot open y.sh
Any reason u an think of ?
But it is working fine when i goto scripts directory and cretae the symbolic link.
... (1 Reply)
Discussion started by: bhargav
1 Replies
3. UNIX for Dummies Questions & Answers
Hi All,
Can any one please explain me what is the difference between hard link and soft link in UNIX.
Thanks in advance
Raja Chokalingam. (2 Replies)
Discussion started by: RAJACHOKALINGAM
2 Replies
4. UNIX for Dummies Questions & Answers
Hi
PLease let me know the usage of Hard Link vs Soft Link
i.e what is the basic difference and what happens when one file is changed or deleted in both the cases???
thanks (3 Replies)
Discussion started by: skyineyes
3 Replies
5. UNIX for Dummies Questions & Answers
Hi Experts,
Please help me out to find out difference between a hard link and a soft link.
I am new in unix plz help me with some example commands ( for creating such links).
Regards
S.Kamakshi :) (2 Replies)
Discussion started by: kamakshi s
2 Replies
6. Shell Programming and Scripting
Hi,
i am trying to create sym links on sles 11 , but it seems i am doing something wrong.
oracle@tests:/u01/app/oracle/oradata/ACIS> pwd
/u01/app/oracle/oradata/ACIS
oracle@tests:/u01/app/oracle/oradata/ACIS> ln -s /db/ACIS/dbase/dbf/ /u01/app/oracle/oradata/ACIS/... (2 Replies)
Discussion started by: tonijel
2 Replies
7. Shell Programming and Scripting
Hello All,
This may be a silly question to some but I am really stuck.
Is there a way to reverse the following;
sudo rm /bin/sh
sudo ln -s /bin/bash /bin/sh
It was part of a driver compile/installation procedure by Digi for Ubuntu stating that dash isn't supported and a symbolic link... (2 Replies)
Discussion started by: LAVco
2 Replies
8. Shell Programming and Scripting
Hi all,
Can anyone please confirm if the command below is the only way that I can get what the symbolic link is set to?
mnlxd110(oracle)/db/posd2/dba$: ls -l | grep "^l"
lrwxrwxrwx 1 oracle dba 28 Aug 9 2011 bdump -> diag/rdbms/posp1/posp1/trace
mnlxd110(oracle)/db/posd2/dba$:... (7 Replies)
Discussion started by: newbie_01
7 Replies
9. UNIX for Dummies Questions & Answers
Hi everybody,
I read about treads realted to this issue but they did not resovle issue given below.
Please help me resolve issue given below
I have html file under /srv/www/htdocs/actual_folder
ls actual_folder/
test.html
and following link works... (0 Replies)
Discussion started by: newbielgn
0 Replies
10. UNIX for Dummies Questions & Answers
Hi, trying to understand more about symblic link, when I compiled a program called "match" in one folder ~/downloadsoftware/I want this program to be accessible like a system command by putting a symbolic link in /usr/bin/ Not by setting the $PATH method in .bashrc at this time.
What I did is:... (4 Replies)
Discussion started by: yifangt
4 Replies
LEARN ABOUT CENTOS
shell-quote
SHELL-QUOTE(1) User Contributed Perl Documentation SHELL-QUOTE(1)
NAME
shell-quote - quote arguments for safe use, unmodified in a shell command
SYNOPSIS
shell-quote [switch]... arg...
DESCRIPTION
shell-quote lets you pass arbitrary strings through the shell so that they won't be changed by the shell. This lets you process commands
or files with embedded white space or shell globbing characters safely. Here are a few examples.
EXAMPLES
ssh preserving args
When running a remote command with ssh, ssh doesn't preserve the separate arguments it receives. It just joins them with spaces and
passes them to "$SHELL -c". This doesn't work as intended:
ssh host touch 'hi there' # fails
It creates 2 files, hi and there. Instead, do this:
cmd=`shell-quote touch 'hi there'`
ssh host "$cmd"
This gives you just 1 file, hi there.
process find output
It's not ordinarily possible to process an arbitrary list of files output by find with a shell script. Anything you put in $IFS to
split up the output could legitimately be in a file's name. Here's how you can do it using shell-quote:
eval set -- `find -type f -print0 | xargs -0 shell-quote --`
debug shell scripts
shell-quote is better than echo for debugging shell scripts.
debug() {
[ -z "$debug" ] || shell-quote "debug:" "$@"
}
With echo you can't tell the difference between "debug 'foo bar'" and "debug foo bar", but with shell-quote you can.
save a command for later
shell-quote can be used to build up a shell command to run later. Say you want the user to be able to give you switches for a command
you're going to run. If you don't want the switches to be re-evaluated by the shell (which is usually a good idea, else there are
things the user can't pass through), you can do something like this:
user_switches=
while [ $# != 0 ]
do
case x$1 in
x--pass-through)
[ $# -gt 1 ] || die "need an argument for $1"
user_switches="$user_switches "`shell-quote -- "$2"`
shift;;
# process other switches
esac
shift
done
# later
eval "shell-quote some-command $user_switches my args"
OPTIONS
--debug
Turn debugging on.
--help
Show the usage message and die.
--version
Show the version number and exit.
AVAILABILITY
The code is licensed under the GNU GPL. Check http://www.argon.org/~roderick/ or CPAN for updated versions.
AUTHOR
Roderick Schertler <roderick@argon.org>
perl v5.16.3 2010-06-11 SHELL-QUOTE(1)