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Full Discussion: ksh String Manipulation - removing variables from within a variable
Top Forums Shell Programming and Scripting ksh String Manipulation - removing variables from within a variable Post 303029761 by apmcd47 on Thursday 31st of January 2019 06:11:21 PM
Old 01-31-2019
@bakunin: I can't get no ... oh!


Parameter expansion gets to combine array expansion with the substitution expansions in both bash and ksh93:
Code:
$ namea=( John Paul George Ringo )
$ exclude=Ringo
$ echo ${namea[@]//$exclude/}
John Paul George

but notice this difference between the two shells:
bash:
Code:
$ nameb=( ${namea[@]//$exclude/} )
$ echo ${#nameb[@]}
3

ksh93:
Code:
$ nameb=( ${namea[@]//$exclude/} )
$ echo ${#nameb[@]}
4

so in bash you could use this method to delete an item from an array but in ksh93 it will simply empty the item.


Andrew
 

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LEARN ABOUT OPENSOLARIS

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/ksh93, /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/ksh93, /usr/bin/pfcsh,
       /usr/bin/pfksh, /usr/bin/pfsh, and /usr/bin/sh, /usr/bin/tcsh, /usr/bin/zsh, and /usr/sfw/bin/zsh. /etc/shells overrides the default list.

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

FILES

       /etc/shells    list of shells on system

SEE ALSO

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

SunOS 5.11							    20 Nov 2007 							 shells(4)
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