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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

setusershell

getusershell(3C)					   Standard C Library Functions 					  getusershell(3C)

NAME

       getusershell, setusershell, endusershell - get legal user shells

SYNOPSIS

       #include <unistd.h>

       char *getusershell(void);

       void setusershell(void);

       void endusershell(void);

DESCRIPTION

       The  getusershell()  function  returns  a  pointer  to  a  legal  user  shell  as defined by the system manager in the file /etc/shells. If
       /etc/shells does not exist, the following locations of the standard system shells are used in its place:

       /bin/bash		  /bin/csh
       /bin/jsh 		  /bin/ksh
       /bin/pfcsh		  /bin/pfksh
       /bin/pfsh		  /bin/sh
       /bin/tcsh		  /bin/zsh
       /sbin/jsh		  /sbin/pfsh
       /sbin/sh 		  /usr/bin/bash
       /usr/bin/csh		  /usr/bin/jsh
       /usr/bin/ksh		  /usr/bin/pfcsh
       /usr/bin/pfksh		  /usr/bin/pfsh
       /usr/bin/sh		  /usr/bin/tcsh
       /usr/bin/zsh		  /usr/xpg4/bin/sh

       The getusershell() function opens the file /etc/shells, if it exists, and returns the next entry in the list of shells.

       The setusershell() function rewinds the file or the list.

       The endusershell() function closes the file, frees any memory used by getusershell() and setusershell(), and rewinds the file /etc/shells.

RETURN VALUES

       The getusershell() function returns a null pointer on EOF.

BUGS

       All information is contained in memory that may be freed with a call to endusershell(), so it must be copied if it is to be saved.

SunOS 5.10							    30 Aug 2004 						  getusershell(3C)
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