Re: ldapscripts unusable from within a 'while read line' loop

[Chris F.A. Johnson]

On Thu, 1 Aug 2013, Lakshminarasimhan Srinivasan wrote:
...
> Description:
>        ldapscripts do not work from inside a "while read line" loop. The 
> exact same scripts were working fine until the last upgrade
>
> Repeat-By:
> Prerequisite: ldapscripts installed.
> Open a new bash script and type in the following:
> -------------------------------------------------
> #!/bin/bash
> echo "Testing if it works outside of the loop"
> ldapid
> echo "Getting into the read line loop"
> while read line
> do
>  ldapid
> done <"Some file"
> ------------------------------------------------
> The 'ldapid' command, which works outside of the loop, does not work from 
> within. This time it throws an error "Cannot guess user". Now we check an 
> alternative:
> Create a new script and type in the following:
> ------------------------------------------------
> #!/bin/bash
> echo "Testing if it works outside of the loop"
> ldapid
> readarray lines < "some file"
> echo "Getting into the for loop"
> for line in "${lines[@]}"
> do
>  ldapid
> done
> -----------------------------------------------
> In this case 'ldapid' works both times. In fact, ldapid works in every other 
> loop except a 'while read line' and I really do not have any idea why.

  I have no idea what ldapid is or does (I can't find it for my
  system), but perhaps it reads from stdin? If it does, it will be
  reading from the file.

--
   Chris F.A. Johnson, <http://cfajohnson.com/>
   Author:
   Pro Bash Programming: Scripting the GNU/Linux Shell (2009, Apress)
   Shell Scripting Recipes: A Problem-Solution Approach (2005, Apress)