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Full Discussion: Usage of #!/bin/ksh
Top Forums UNIX for Dummies Questions & Answers Usage of #!/bin/ksh Post 302551427 by gary_w on Tuesday 30th of August 2011 10:32:57 AM
Old 08-30-2011
In a nutshell, the first 2 characters happen to be the ascii representation of the hex values 0x23 0x21 which is a "magic number" that the shell interpreter uses. When the interpreter sees the #! as the first 2 characters, it builds a command line consisting of the remaining characters after the #! followed by the filename itself along with any values passed to it. i.e. for the following script called show_message:
Code:
#!/bin/ksh 
print $1

called like this:
Code:
show_message "hello world!"

The actual command line run by the system would be:
Code:
/bin/ksh show_message "hello world!"

The command after the #! does not have to be a shell either. Try this script:
Code:
#!/bin/ls -l

or this:
Code:
#!/bin/rm
print This will not show because the script is deleted on the first line

This User Gave Thanks to gary_w For This Post:
Dev_Dev
 

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LEARN ABOUT OPENSOLARIS

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/ksh93		    /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/ksh93 	    /usr/bin/pfcsh
	 /usr/bin/pfksh 	    /usr/bin/pfsh
	 /usr/bin/sh		    /usr/bin/tcsh
	 /usr/bin/zsh		    /usr/sfw/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.

NOTES

       Restricted shells should not be listed in /etc/shells.

SunOS 5.11							    1 Nov 2007							  getusershell(3C)
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