12-14-2010
Best way to edit a file
looking for a script or command to push out from a centralized machine to multiple machines. I have the software in place that will do this already, but I need to tell it what command to run on each machine with this file.
what I need is a script or command to edit a file in a specific manner. Say I have a file such as the one below. What I need to do is search the file for a specific line, in this case the line "users_here[tab space]u1=usera,userb,userc", and delete the text "usera,". I don't want it to remove ALL instances of "usera" throughout the file, and I don't want to output this to a new file. I need to search the file for the line, remove 'usera' if it's in THAT specific line, and leave the file intact after it edits/removes "usera" from that line. Any help with this?
#
user_goHere
user2_goHere
users_here[tab space]u1=usera,userb,userc
users_there[tab space]u2=user1,user2,user3
here is more text in the file that also contains usera, but i don't want it delete this one. here's another usera, but i don't want it to remove this either.
and here is some more text in the file.
#
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LEARN ABOUT OPENDARWIN
share
share(1M) share(1M)
NAME
share - make local resource available for mounting by remote systems
SYNOPSIS
share [-F FSType] [-o specific_options] [-d description] [pathname]
The share command exports, or makes a resource available for mounting, through a remote file system of type FSType. If the option -F FSType
is omitted, the first file system type listed in /etc/dfs/fstypes is used as default. For a description of NFS specific options, see
share_nfs(1M). pathname is the pathname of the directory to be shared. When invoked with no arguments, share displays all shared file sys-
tems.
-F FSType
Specify the filesystem type.
-o specific_options
The specific_options are used to control access of the shared resource. (See share_nfs(1M) for the NFS specific options.) They may be
any of the following:
rw
pathname is shared read/write to all clients. This is also the default behavior.
rw=client[:client]...
pathname is shared read/write only to the listed clients. No other systems can access pathname.
ro
pathname is shared read-only to all clients.
ro=client[:client]...
pathname is shared read-only only to the listed clients. No other systems can access pathname.
Separate multiple options with commas. Separate multiple operands for an option with colons. See .
-d description
The -d flag may be used to provide a description of the resource being shared.
Example 1: Sharing a Read-Only Filesystem
This line will share the /disk file system read-only at boot time.
share -F nfs -o ro /disk
Example 2: Invoking Multiple Options
The following command shares the filesystem /export/manuals, with members of the netgroup having read-only access and users on the speci-
fied host having read-write access.
share -F nfs -o ro=netgroup_name,rw=host1:host2:host3 /export/manuals
/etc/dfs/dfstab
list of share commands to be executed at boot time
/etc/dfs/fstypes
list of file system types, NFS by default
/etc/dfs/sharetab
system record of shared file systems
See attributes(5) for descriptions of the following attributes:
+-----------------------------+-----------------------------+
| ATTRIBUTE TYPE | ATTRIBUTE VALUE |
+-----------------------------+-----------------------------+
|Availability |SUNWcsu |
+-----------------------------+-----------------------------+
mountd(1M), nfsd(1M), share_nfs(1M), shareall(1M), unshare(1M), attributes(5)
Export (old terminology): file system sharing used to be called exporting on SunOS 4.x, so the share command used to be invoked as
exportfs(1B) or /usr/sbin/exportfs.
If share commands are invoked multiple times on the same filesystem, the last share invocation supersedes the previous--the options set by
the last share command replace the old options. For example, if read-write permission was given to usera on /somefs, then to give read-
write permission also to userb on /somefs:
example% share -F nfs -o rw=usera:userb /somefs
This behavior is not limited to sharing the root filesystem, but applies to all filesystems.
9 Dec 2004 share(1M)