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Full Discussion: replace shell (sh)
Top Forums UNIX for Dummies Questions & Answers replace shell (sh) Post 302088107 by blowtorch on Friday 8th of September 2006 12:47:01 PM
Old 09-08-2006
For linux, it is actually bash and not sh. sh is a link to bash.

Also, what error did it give? Just "gave an error" does absolutely nothing toward describing the actual error.

Another thing, you cannot just replace /sbin/sh with the same binary as /bin/sh. They are two very different things. The /sbin/sh binary is statically linked (it uses no external libraries). This is helpful if your /usr partition ever gets corrupted and cannot be mounted during boot. If your /sbin/sh is also dynamically linked, if /usr does not mount, you are, in effect, screwed.

So, know what you are doing before you replace sh with your own binary. Remember that sh is used by the system rc scripts during boot. Your new sh better do all that the old one did.
 

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LEARN ABOUT SUNOS

unlink

link(1M)						  System Administration Commands						  link(1M)

NAME

       link, unlink - link and unlink files and directories

SYNOPSIS

       /usr/sbin/link  existing-file new-file

       /usr/xpg4/bin/link  existing-file new-file

       /usr/sbin/unlink  file

DESCRIPTION

       The link and unlink commands link and unlink files and directories. Only super-users can use these commands on directories.

       Use  link  to  create  a new file that points to an existing file. The  existing-file and  new-file operands  specify the existing file and
       newly-created files.  See OPERANDS.

       link and  unlink directly invoke the link(2) and unlink(2) system calls, performing exactly what they are told to  do  and  abandoning  all
       error checking. This differs from the  ln(1) command. See  ln(1).

       While linked files and directories can be removed using unlink, it is safer to use rm(1) and rmdir(1) instead. See  rm(1) and  rmdir(1).

   /usr/xpg4/bin/link
       If  the	existing  file being hard linked is itself a symbolic link, then the newly created file (new-file) will be a hard link to the file
       referenced by the symbolic link, not to the symbolic link object itself (existing-file).

OPERANDS

       The following operands are supported:

       existing-file   Specifies the name of the existing file to be linked.

       file	       Specifies the name of the file to be unlinked.

       new-file        Specifies the name of newly created (linked) file.

ENVIRONMENT VARIABLES

       See  environ(5) for descriptions of the following environment variables that affect the execution of  link: LANG, LC_ALL, LC_CTYPE, LC_MES-
       SAGES, and NLSPATH.

ATTRIBUTES

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

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

   /usr/xpg4/bin/link
       +-----------------------------+-----------------------------+
       |      ATTRIBUTE TYPE	     |	    ATTRIBUTE VALUE	   |
       +-----------------------------+-----------------------------+
       |Availability		     |SUNWxcu4			   |
       +-----------------------------+-----------------------------+
       |Interface Stability	     |Standard			   |
       +-----------------------------+-----------------------------+

SEE ALSO

       ln(1), rm(1), link(2), unlink(2), attributes(5), environ(5), standards(5)

SunOS 5.10							    9 Oct 2002								  link(1M)
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