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Top Forums Shell Programming and Scripting Why I get bad bad substitution when using eval? Post 302548666 by 915086731 on Friday 19th of August 2011 02:48:59 AM
Old 08-19-2011
Why I get bad bad substitution when using eval?

Why I get bad replace when using eval?

Code:
[river@localhost ate]$ map0=( "0"  "0000"  "0") 
[river@localhost ate]$ i=0
 [river@localhost ate]$ eval echo  \${map$i[1]}
 0000 
[river@localhost ate]$ a=`eval echo  \${map$i[1]}`                            !!!error happens!!!
 bash: ${map$i[1]}: bad substitution

How to resolve it ?
Thanks!

Last edited by 915086731; 08-19-2011 at 03:54 AM..
 

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YPWHICH(1)						    BSD General Commands Manual 						YPWHICH(1)

NAME
ypwhich -- return hostname of NIS server of map master SYNOPSIS
ypwhich [-T] [-d domain] [[-h] host] ypwhich [-fTt] [-d domain] [-h host] -m [mname] ypwhich -x DESCRIPTION
ypwhich tells which NIS server supplies NIS services to a client, or which is the master for a map. If invoked without arguments, it gives the NIS server for the local machine. If host is specified, that machine is queried to find out which NIS server it is using. The options are as follows: -d domain Specify a domain other than the default domain. -f When used in conjunction with -m, force ypwhich to query host directly, without using the local copy of ypbind(8). -h host Specify a host other than localhost to query for information. -m [mname] Find the master NIS server for the named map. mname can be a map name or nickname. If mname is omitted, ypwhich will produce a list of available maps. -T Use TCP protocol instead of UDP. -t Inhibit translation of map nicknames to their corresponding map names. -x Display the map nickname table, found in /var/yp/nicknames. A built-in default translation table is used if /var/yp/nicknames does not exist (see nicknames(5) for details). EXIT STATUS
ypwhich exits with a non-zero exit code if -m is used, and there was a problem in determining the map's master. SEE ALSO
domainname(1), ypcat(1), ypmatch(1), nicknames(5), nis(8), ypbind(8), yppoll(8), ypset(8) AUTHORS
Charles D. Cranor Greywolf BSD
January 24, 2008 BSD
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