Hey, I'm creating a custom useradd script, and I'm giving the option to add secondary groups. Basically what I want to do is ask for the name of the group, you type in the group you want to add, it assigns that group name to the variable $sgroup. Then the scripts asks if you want add another. If you say yes, then I want it to grab the next one you type in, and append it with a comma to the end of $sgroup.
So when all is said and done, if you have added three groups, then the value of $sgroup would be like this:
$sgroup="group1,group2,group3"
See what I mean, that way, when I'm doing the useradd command in my script, I can just use the -G option, and say, "-G $sgroup"
I'm trying to use a while loop to do it, but it doesn't seem to be working. How should I go about doing this?
I'll post my current code below, but you don't need to look at it if you don't want. It's kind of lengthy for such a simple thing. FYI, I know this code doesn't work, currently, if you choose to add another, it will just overwrite the old $sgroup with a new group name.
Hi,
I searched the forum for this but couldn't find the answer. Basically I have a line of code I want to insert into a file using sed. The line of code is basically something like "address=1.1.1.1" where 1.1.1.1 is an IP Address that will vary depending on what the user enters. I'll just refer... (4 Replies)
Hi All,
I have a requirement, in which i have to append some spaces to the variable, and then send it to another function.
I am new to the UNIX shell programming. Ultimately the length of the string should be 40 characters.
exp:
Login = "rallapalli" (length = 10)
i have to append 30 spaces to... (2 Replies)
Hi
I need to write a script where there the user enters 3 input parameter
variable
number
the program should ask the user left or right
if it is left , the number specified that many spaces should be added to the value in front of the value and saved in the samee variable itself and if it is... (5 Replies)
In a particular path of a server I have number of files.The files are generated every date with a date_mth stap on this.There are different files for different clients.
For example in /data1 path i have
X_0416_Score
Y_0416_Score
Z_0417_Score
X_0417_Score
A_0417_Score
If i will run the... (1 Reply)
Hi,
I would like to know if it's possible to append data into a variable, rather than into a file. Although I can write information into a temporary file in /tmp, I'd rather if possible write into a variable, as I don't like the idea that should my script fail, I'll be polluting the server with... (5 Replies)
I have a Query!
by using command
cat >> file1 we can append data's to a already existing file, Similarly is it possible to append a data to a variable.
Thanks in Advance!! (2 Replies)
hi guys,
would appreciate some help here. I need to append running numbers using sed onto a variable that contain a list of IP addresses. I'm basically stuck on the running number part. e.g.
1. 10.0.0.1
2. 10.0.0.2
3. 10.0.0.3 (10 Replies)
I want to append matched output and cat the results into an variable. but I've been running into problems. sed is printing result on to screen instead of appending the output to $CAPTURE. I'm stumped...how should i fix this?
contents of $TEST
10.0.0.1
10.0.0.2
10.0.0.3
10.0.0.4
expected... (5 Replies)
Dear All,
i have filename RYK3201_032001002.pdf
and i am using below command to get a file
file_name1=$(echo $file_name | cut -d "_" -f2 | cut -d "." -f1 | cut -c -6)
and then
file_name2=${NewFile_NAME}_$file_name1
now the value of file_name1 will be 032001
i want to file_name1... (5 Replies)
Discussion started by: yadavricky
5 Replies
LEARN ABOUT MINIX
mh-alias
MH-ALIAS(5) [nmh-1.5] MH-ALIAS(5)NAME
mh-alias - alias file for nmh message system
SYNOPSIS
any nmh command
DESCRIPTION
This describes both nmh personal alias files and the global alias file for nmh mail delivery, the file
/etc/nmh/MailAliases
It does not describe aliases files used by the message transport system. Each line of the alias file has the format:
alias : address-group
or
alias ; address-group
or
< alias-file
or
; comment
where:
address-group := address-list
| < file
| = UNIX-group
| + UNIX-group
| *
address-list := address
| address-list, address
Continuation lines in alias files end with `' followed by the newline character.
"Alias-file" and "file" are UNIX file names. UNIX-group is a group name (or number) from /etc/group. An address is a "simple" Inter-
net-style address. Througout this file, case is ignored, except for file names.
If the line starts with a `<', then the file named after the `<' is read for more alias definitions. The reading is done recursively, so a
`<' may occur in the beginning of an alias file with the expected results.
If the address-group starts with a `<', then the file named after the `<' is read and its contents are added to the address-list for the
alias.
If the address-group starts with an `=', then the file /etc/group is consulted for the UNIX-group named after the `='. Each login name
occurring as a member of the group is added to the address-list for the alias.
In contrast, if the address-group starts with a `+', then the file /etc/group is consulted to determine the group-id of the UNIX-group
named after the `+'. Each login name occurring in the /etc/passwd file whose group-id is indicated by this group is added to the
address-list for the alias.
If the address-group is simply `*', then the file /etc/passwd is consulted and all login names with a userid greater than some magic number
(usually 200) are added to the address-list for the alias.
In match, a trailing "*" on an alias will match just about anything appropriate. (See example below.)
An approximation of the way aliases are resolved at posting time is (it's not really done this way):
1) Build a list of all addresses from the message to be delivered, eliminating duplicate addresses.
2) If this draft originated on the local host, then for those addresses in the message that have no host specified, perform alias resolu-
tion.
3) For each line in the alias file, compare "alias" against all of the existing addresses. If a match, remove the matched "alias" from
the address list, and add each new address in the address-group to the address list if it is not already on the list. The alias
itself is not usually output, rather the address-group that the alias maps to is output instead. If "alias" is terminated with a `;'
instead of a `:', then both the "alias" and the address are output in the correct format. (This makes replies possible since nmh
aliases and personal aliases are unknown to the mail transport system.)
Since the alias file is read line by line, forward references work, but backward references are not recognized, thus, there is no recur-
sion.
Example Alias File:
</etc/nmh/BBoardAliases
sgroup: fred, fear, freida
b-people: Blind List: bill, betty;
fred: frated@UCI
UNIX-committee: <unix.aliases
staff: =staff
wheels: +wheel
everyone: *
news.*: news
The first line says that more aliases should immediately be read from the file /etc/nmh/BBoardAliases. Following this, "fred" is defined
as an alias for "frated@UCI", and "sgroup" is defined as an alias for the three names "frated@UCI", "fear", and "freida".
The alias "b-people" is a blind list which includes the addresses "bill" and "betty"; the message will be delieved to those addresses, but
the message header will show only "Blind List: ;" (not the addresses).
Next, the definition of "UNIX-committee" is given by reading the file unix.aliases in the users nmh directory, "staff" is defined as all
users who are listed as members of the group "staff" in the /etc/group file, and "wheels" is defined as all users whose group-id in
/etc/passwd is equivalent to the "wheel" group.
Finally, "everyone" is defined as all users with a user-id in /etc/passwd greater than 200, and all aliases of the form "news.<anything>"
are defined to be "news".
The key thing to understand about aliasing in nmh is that aliases in nmh alias files are expanded into the headers of messages posted.
This aliasing occurs first, at posting time, without the knowledge of the message transport system. In contrast, once the message trans-
port system is given a message to deliver to a list of addresses, for each address that appears to be local, a system-wide alias file is
consulted. These aliases are NOT expanded into the headers of messages delivered.
HELPFUL HINTS
To use aliasing in nmh quickly, do the following:
1) In your .mh_profile, choose a name for your alias file, say "aliases", and add the line:
Aliasfile: aliases
2) Create the file "aliases" in your nmh directory.
3) Start adding aliases to your "aliases" file as appropriate.
FILES
/etc/nmh/MailAliases global nmh alias file
PROFILE COMPONENTS
Aliasfile: For a default alias file
SEE ALSO ali(1), send(1), whom(1), group(5), passwd(5), conflict(8), post(8)CONTEXT
None
BUGS
Although the forward-referencing semantics of mh-alias files prevent recursion, the "< alias-file" command may defeat this. Since the num-
ber of file descriptors is finite (and very limited), such infinite recursion will terminate with a meaningless diagnostic when all the fds
are used up.
Forward references do not work correctly inside blind lists.
MH.6.8 11 June 2012 MH-ALIAS(5)