Wrong Shell Invoking My Script On Linux Post: 40196

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Top Forums Shell Programming and Scripting Wrong Shell Invoking My Script On Linux Post 40196 by Perderabo on Wednesday 10th of September 2003 10:18:31 PM

09-10-2003

Administrator Emeritus

The second shell for unix was csh. Shortly after csh arrived, the SHELL environment variable was introduced. It was set to the value of the shell field in /etc/passwd. From it's inception, it was intended to be the user's favorite interactive shell. Programs like vi refer to it when when they are asked to spawn an interactive shell. If it also was for scripts, that would mean that we must use the same shell for interactive use and for scripts. csh was better than sh as an interactive shell but sh was better than csh for scripts.

The only exception to this that I know of is with the program "make". It reads the environment and treats each environment variable as a make macro. That includes the SHELL macro, the environment SHELL variable overrides make's internal deafault for SHELL. So all non-trivial makefiles now explicitly set the SHELL macro. make's habit of assuming that the entire environment is intended for it is not great behavior.

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LEARN ABOUT SUNOS

suspend

suspend(1)							   User Commands							suspend(1)

NAME

       suspend - shell built-in function to halt the current shell

SYNOPSIS

   sh
       suspend

   csh
       suspend

   ksh
       suspend

DESCRIPTION

   sh
       Stops the execution of the current shell (but not if it is the login shell).

   csh
       Stop the shell in its tracks, much as if it had been sent a stop signal with ^Z. This is most often used to stop shells started by su.

   ksh
       Stops the execution of the current shell (but not if it is the login shell).

ATTRIBUTES

       See attributes(5) for descriptions of the following attributes:

       +-----------------------------+-----------------------------+
       |      ATTRIBUTE TYPE	     |	    ATTRIBUTE VALUE	   |
       +-----------------------------+-----------------------------+
       |Availability		     |SUNWcsu			   |
       +-----------------------------+-----------------------------+

SEE ALSO

       csh(1), kill(1), ksh(1), sh(1), su(1M), attributes(5)

SunOS 5.10							    15 Apr 1994 							suspend(1)