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Full Discussion: Group Exist Scripting
Top Forums Shell Programming and Scripting Group Exist Scripting Post 302387493 by Scrutinizer on Saturday 16th of January 2010 09:25:46 AM
Old 01-16-2010
You can only grep the group file if your machine is not hooked up to nis+ or ldap or something. On linux you could do something like this:
Code:
newgrp="somegroup"
if ! getent group $newgroup >/dev/null; then
  newgroup=users
fi

On HP-UX you can use grget instead of getent group, so it depends what tool you should use. I am sure there are other methods too.
 

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getent(1M)						  System Administration Commands						getent(1M)

NAME
getent - get entries from administrative database SYNOPSIS
getent database [key]... DESCRIPTION
getent gets a list of entries from the administrative database specified by database. The information generally comes from one or more of the sources that are specified for the database in /etc/nsswitch.conf. database is the name of the database to be examined. This can be passwd, group, hosts, ipnodes, services, protocols, ethers, project, net- works, or netmasks. For each of these databases, getent uses the appropriate library routines described in getpwnam(3C), getgrnam(3C), gethostbyaddr(3NSL), gethostbyname(3NSL), getipnodebyaddr(3SOCKET), getipnodebyname(3SOCKET), getservbyname(3SOCKET), getprotoby- name(3SOCKET), ethers(3SOCKET), getprojbyname(3PROJECT) and getnetbyname(3SOCKET), respectively. Each key must be in a format appropriate for searching on the respective database. For example, it can be a username or numeric-uid for passwd; hostname or IP address for hosts; or service, service/protocol, port, or port/proto for services. getent prints out the database entries that match each of the supplied keys, one per line, in the format of the matching administrative file: passwd(4), group(4), project(4), hosts(4), services(4), protocols(4), ethers(3SOCKET), networks(4), or netmasks(4). If no key is given, all entries returned by the corresponding enumeration library routine, for example, getpwent() or gethostent(), are printed. Enumer- ation is not supported on ipnodes. Key Interpretation for passwd and group Databases When getent is invoked with database set to passwd, each key value is processed as follows: o If the key value consists only of numeric characters, getent assumes that the key value is a numeric user ID and searches the user database for a matching user ID. o If the user ID is not found in the user database or if the key value contains any non-numeric characters, getent assumes the key value is a user name and searches the user database for a matching user name. Similarly, when getent is invoked with database set to group, each key value is processed as follows: o If the key value consists only of numeric characters, getent assumes that the key value is a numeric group ID and searches the group database for a matching group ID. o If the group ID is not found in the group database or if the key value contains any non-numeric characters, getent assumes the key value is a group name and searches the group database for a matching group name. EXIT STATUS
The following exit values are returned: 0 Successful completion. 1 Command syntax was incorrect, an invalid option was used, or an internal error occurred. 2 At least one of the specified entry names was not found in the database. 3 There is no support for enumeration on this database. FILES
/etc/nsswitch.conf name service switch configuration file /etc/passwd password file /etc/group group file /etc/inet/hosts IPv4 and IPv6 host name database /etc/services Internet services and aliases /etc/project project file /etc/protocols protocol name database /etc/ethers Ethernet address to hostname database or domain /etc/networks network name database /etc/netmasks network mask database ATTRIBUTES
See attributes(5) for descriptions of the following attributes: +-----------------------------+-----------------------------+ | ATTRIBUTE TYPE | ATTRIBUTE VALUE | +-----------------------------+-----------------------------+ |Availability |SUNWcsu | +-----------------------------+-----------------------------+ SEE ALSO
ethers(3SOCKET), getgrnam(3C), gethostbyaddr(3NSL), gethostbyname(3NSL), gethostent(3NSL), getipnodebyaddr(3SOCKET), getipnodeby- name(3SOCKET), getnetbyname(3SOCKET), getprojbyname(3PROJECT), getprotobyname(3SOCKET), getpwnam(3C), getservbyname(3SOCKET), group(4), hosts(4), netmasks(4), networks(4), nsswitch.conf(4), passwd(4), project(4), protocols(4), services(4), attributes(5) SunOS 5.11 26 Mar 2007 getent(1M)
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