06-19-2013
sh, bash and ksh sets variables with just the "=" sign (i.e., aa=boo) while csh and tcsh sets variables with set at the beginning of the line (i.e., set aa = boo) ...
variables are usually local to the subshell the script/user is working in ... if a variable is being set by one shell and needed to be used in another shell, the variable must be exported or shared from the local shell and imported by the other shells ...
sh, bash, and ksh uses export while csh and tcsh uses setenv to share the variables from the local shell ...
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forgot about the info on set that bakunin mentioned ... guess i need to get reading again ...
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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,
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/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)