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Full Discussion: Foreach loop with two variables
Top Forums Shell Programming and Scripting Foreach loop with two variables Post 302950712 by MadeInGermany on Tuesday 28th of July 2015 06:35:38 AM
Old 07-28-2015
I guess you want to read from the two files simultaneously?
With /bin/sh (bash, ksh, zsh, ash, dash, ...)
Code:
#!/bin/sh
while read x && read z <&3
do
   echo "sql $x -u$z"
done < /local/hd3/dba/tools/build_db_scripts/dbs 3< /local/hd3/dba/tools/build_db_scripts/dbas

csh/tcsh cannot do that (need an external tool and would remain clumsy).
For example, with the paste command
Code:
#!/bin/csh
set f=0
foreach i ( `paste /local/hd3/dba/tools/build_db_scripts/dbs /local/hd3/dba/tools/build_db_scripts/dbas` )
  if ( "$f" == 0 ) then
    set x=$i
  else
    echo "sql $x -u$i"
  endif
  @ f = 1 - $f
end

But it does not really know which value comes from which file. If a line contains a space it will mix up.
Last edited by MadeInGermany; 07-28-2015 at 07:48 AM.. Reason: (bad) example with csh
This User Gave Thanks to MadeInGermany For This Post:
deneuve01
 

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LEARN ABOUT SUNOS

shells

shells(4)							   File Formats 							 shells(4)

NAME

       shells - shell database

SYNOPSIS

       /etc/shells

DESCRIPTION

       The shells file contains a list of the shells on the system. Applications use this file to determine whether a shell is valid. See getuser-
       shell(3C). For each shell a single line should be present, consisting of the shell's path, relative to root.

       A hash mark (#) indicates the beginning of a comment; subsequent characters up to the end of the line are not interpreted by  the  routines
       which search the file. Blank lines are also ignored.

       The  following  default	shells are used by utilities: /bin/bash, /bin/csh, /bin/jsh, /bin/ksh, /bin/pfcsh, /bin/pfksh, /bin/pfsh, /bin/sh,
       /bin/tcsh,  /bin/zsh,  /sbin/jsh,  /sbin/sh,  /usr/bin/bash,  /usr/bin/csh,  /usr/bin/jsh,  /usr/bin/ksh,  /usr/bin/pfcsh,  /usr/bin/pfksh,
       /usr/bin/pfsh, and /usr/bin/sh, /usr/bin/tcsh, /usr/bin/zsh. Note that /etc/shells overrides the default list.

       Invalid shells in /etc/shells may cause unexpected behavior (such as being unable to log in by way of ftp(1)).

FILES

       /etc/shells	       lists shells on system

SEE ALSO

       vipw(1B), ftpd(1M), sendmail(1M), getusershell(3C), aliases(4)

SunOS 5.10							    4 Jun 2001								 shells(4)
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