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Shell Programming and Scripting

Script to move the first line of a file to the end

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Top Forums Shell Programming and Scripting Script to move the first line of a file to the end
# 22  
Old 01-07-2009
Quote:
Originally Posted by methyl
... We are learning from cfajohnson of a move towards Posix-2 , but to get "normal" Berkeley behaviour from commands such as "ps" and "xd" we often need to go outside Posix-2 and even the less-strict XPG4 standard
Some clarification is needed here in case readers think that "Posix-2" is some sort of a new standard or specification. It is not.

The last version of POSIX.2 standard, i.e. IEEE 1003.2-1992, was in 1992.
XPG4 is a specification and not a standard and has long been superceded by later TOG specifications.

IEEE 1003.2-1992 was subsumed into IEEE 1003-1 as part of the work of the Austin Common Standards Revision Group (the Austin Working Group) for IEEE 1003.1-2001. Work on the latest revision to IEEE 1003.1 is just complete. IEEE.1003.1-2008 was released in December 2008.
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LEARN ABOUT MINIX

shift

shift(1)                                                           User Commands                                                          shift(1)

NAME

       shift - shell built-in function to traverse either a shell's argument list or a list of field-separated words

SYNOPSIS

   sh
       shift [n]

   csh
       shift [variable]

   ksh
       * shift [n]

DESCRIPTION

   sh
       The positional parameters from $n+1 ... are renamed $1 ... . If n is not given, it is assumed to be 1.

   csh
       The  components of argv, or variable, if supplied, are shifted to the left, discarding the first component. It is an error for the variable
       not to be set or to have a null value.

   ksh
       The positional parameters from $n+1 $n+1 ... are renamed $1 ..., default n is 1. The parameter n can  be  any  arithmetic  expression  that
       evaluates to a non-negative number less than or equal to $#.

       On this man page, ksh(1) commands that are preceded by one or two * (asterisks) are treated specially in the following ways:

       1.  Variable assignment lists preceding the command remain in effect when the command completes.

       2.  I/O redirections are processed after variable assignments.

       3.  Errors cause a script that contains them to abort.

       4.  Words,  following a command preceded by ** that are in the format of a variable assignment, are expanded with the same rules as a vari-
           able assignment. This means that tilde substitution is performed after the = sign and word splitting and file name generation  are  not
           performed.

ATTRIBUTES

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

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

SEE ALSO

       csh(1), ksh(1), sh(1), attributes(5)

SunOS 5.10                                                          15 Apr 1994                                                           shift(1)