HPUX sh[1]

 sh(1)                                                                 sh(1)





 NAME
      sh - overview of various system shells

 SYNOPSIS
    POSIX Shell:
      sh [+-aefhikmnoprstuvx] [+-o option] ...  [-c string] [arg ...]

    Bourne Shell:
      sh [--acefhiknrstuvx ...] [arg ...]
      rsh [--acefhiknrstuvx ...] [arg ...]

    Korn Shell:
      ksh [+-aefhikmnoprstuvx] [+-o option] ...  [-c string] [arg ...]
      rksh [+-aefhikmnoprstuvx] [+-o option] ...  [-c string] [arg ...]

    C Shell:
      csh [-cefinstvxTVX] [command_file] [argument_list ...]

    Key Shell:
      keysh

 DESCRIPTION
    Remarks:
      The POSIX.2 standard requires that, on a POSIX-compliant system,
      executing the command .sh activates the POSIX shell (located in file
      /bin/posix/sh on HP-UX systems), and executing the command man sh
      produces an on-line manual entry that displays the syntax of the POSIX
      shell command-line.

      However, the sh command has historically been associated with the
      conventional Bourne shell, which could confuse some users.  To meet
      standards requirements and also clarify the relationships of the
      various shells and where they reside on the system, this entry
      provides command-line syntax and a brief description of each shell,
      and lists the names of the manual entries where each shell is
      described in greater detail.

    Shell Descriptions
      The HP-UX operating system supports the following shells:

           sh        POSIX-conformant command programming language and
                     commands interpreter residing in file /bin/posix/sh.
                     Can execute commands read from a terminal or a file.
                     This shell conforms to current POSIX standards in
                     effect at the time the HP-UX system release was
                     introduced, and is similar to the Korn shell in many
                     respects.  Similar in many respects to the Korn shell,
                     the POSIX shell contains a history mechanism, supports
                     job control, and provides various other useful
                     features.




 Hewlett-Packard Company            - 1 -     HP-UX Release 9.0: August 1992






 sh(1)                                                                 sh(1)





           sh        Bourne-shell command programming language and commands
                     interpreter residing in file /bin/sh.  Can execute
                     commands read from a terminal or a file.  This shell
                     lacks many features contained in the POSIX and Korn
                     shells.

           ksh       Korn-shell command programming language and commands
                     interpreter residing in file /bin/ksh.  Can execute
                     commands read from a terminal or a file.  This shell,
                     like the POSIX shell, contains a history mechanism,
                     supports job control, and provides various other useful
                     features.

           csh       A command language interpreter that incorporates a
                     command history buffer, C-language-like syntax, and job
                     control facilities.

           rsh       Restricted version of the Bourne-shell command
                     interpreter.  Sets up a login name and execution
                     environment whose capabilities are more controlled
                     (restricted) than normal user shells.

           rksh      restricted version of the Korn-shell command
                     interpreter Sets up a login name and execution
                     environment whose capabilities are more controlled
                     (restricted) than normal user shells.

           keysh     An extension of the standard Korn Shell that uses
                     hierarchical softkey menus and context-sensitive help.

           center box tab(;); cBw(1.2i) |cBw(1.7i) a  |af4p+1.  To obtain:;
           Use the command: _ Bourne Shell;/bin/sh ...  Korn Shell;/bin/ksh
           ...  POSIX Shell;/bin/posix/sh ...  C Shell;/bin/csh ...  Key
           Shell;/usr/bin/keysh

      These shells can also be the default invocation, depending on the
      entry in the /etc/passwd file.  See also chsh(1).

      Whether the sh command invokes the Bourne Shell or the POSIX Shell
      depends on the setting of the PATH environment variable.

      The default PATH in file /etc/profile is set to invoke the POSIX
      shell.

 WARNINGS
      Many manual entries contain descriptions of shell behavior or describe
      program or application behavior similar to ``the shell'' with a
      reference to ``see sh(1)''.

      These various references to sh(1) generally pertain to the Bourne
      shell, and may or may not reflect the behavior of the POSIX shell in



 Hewlett-Packard Company            - 2 -     HP-UX Release 9.0: August 1992






 sh(1)                                                                 sh(1)





      specific situations.  Exercise due caution when noting references to
      shell behavior because the various shells were invented in different
      years by different people, and each has its own unique
      characteristics.

 SEE ALSO
      For more information on the various individual shells, see:

      sh-bourne(1)   Bourne Shell (/bin/sh) description.
      ksh(1)         Korn Shell (/bin/ksh) description.
      sh-posix(1)    POSIX Shell (/bin/posix/sh) description.
      csh(1)         C Shell (/bin/csh) description.
      keysh(1)       Key Shell (/usr/bin/keysh) description.









































 Hewlett-Packard Company            - 3 -     HP-UX Release 9.0: August 1992