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Full Discussion: pipe command for array
Top Forums Shell Programming and Scripting pipe command for array Post 302323171 by Corona688 on Friday 5th of June 2009 03:20:38 PM
Old 06-05-2009
names is not and never was an array. The shell splits it into a list when you give it ${names}, the same way echo is given the arguments a and b seperately when you do echo a b . The shell always does this unless you force it not to by surrounding a string with double quotes, i.e. "${names}". Single quotes, on the other hand, force it to take the string entirely literally and substitute no variables at all.

/bin/sh in fact is not strictly required to support arrays at all, but bash or ksh both do and often stand in for plain sh anyway. If your program demands arrays it ought to use one of those and not sh.

An array and loop in bash:

Code:
#!/bin/bash
NAMES=( a b )
for ((N=0; N<${#NAMES[*]}; N++))
do
  echo "${NAMES[$N]}"
done

 

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LEARN ABOUT SUNOS

getusershell

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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