Shells: User's Guide
Contents
1. 201 767 4990 Technical Addendum to the 1 1 Shells User s Guide Bourne Shell usr old bin sh The Bourne shell is obsoleted at the HP UX 10 0 release and is replaced by the POSIX shell the new standard shell on HP UX Using the POSIX shell gives you continued support and additional advanced features These features are listed in the POSIX shell description later in this document Because the Bourne shell will not be enhanced in the future it is recommended that you use the POSIX shell The POSIX shell is an enhanced version of the Bourne shell so your existing Bourne shell scripts should run under the new POSIX shell with minimal or no changes However you might see some differences such as m Positional parameters are saved during a function call a Errors in functions will abort the function but will not abort the script m Function lookup is done before the built in commands a Error messages output by the POSIX shell might be different from Bourne shell messages m Changing the value of LC_CTYPE or LANG after the shell has started will not affect the lexical processing of shell commands in the current shell or its subshells See sh posix 1 to verify functionality If you still need to use the Bourne shell it is available as usr old bin sh C Shell usr bin csh There are no new features for the HP UX 10 0 release 1 2 Technical Addendum to the Shells User s Guide Korn Shell usr bin ksh Th2. Technical Addendum to the Shells User s Guide HP 9000 L HEWLETT PACKARD HP Part No B2355 90072 Printed in USA January 1995 First Edition E0195 Legal Notices The information in this document is subject to change without notice Hewlett Packard makes no warranty of any kind with regard to this manual including but not limited to the implied warranties of merchantability and fitness for a particular purpose Hewlett Packard shall not be held liable for errors contained herein or direct indirect special incidental or consequential damages in connection with the furnishing performance or use of this material Warranty A copy of the specific warranty terms applicable to your Hewlett Packard product and replacement parts can be obtained from your local Sales and Service Office Restricted Rights Legend Use duplication or disclosure by the U S Government is subject to restrictions as set forth in subparagraph c 1 ii of the Rights in Technical Data and Computer Software clause at DFARS 252 227 7013 for DOD agencies and subparagraphs c 1 and c 2 of the Commercial Computer Software Restricted Rights clause at FAR 52 227 19 for other agencies HEWLETT PACKARD COMPANY 3000 Hanover Street Palo Alto California 94304 U S A Use of this manual and flexible disk s or tape cartridge s supplied for this pack is restricted to this product only Additional copies of the programs may be made for security and b
3. ack up purposes only Resale of the programs in their present form or with alterations is expressly prohibited Copyright Notices copyright 1983 95 Hewlett Packard Company all rights reserved Reproduction adaptation or translation of this document without prior written permission is prohibited except as allowed under the copyright laws copyright 1979 1980 1983 1985 93 Regents of the University of California This software is based in part on the Fourth Berkeley Software Distribution under license from the Regents of the University of California copyright 1980 1984 1986 Novell Inc copyright 1986 1992 Sun Microsystems Inc copyright 1985 86 1988 Massachusetts Institute of Technology copyright 1989 93 The Open Software Foundation Inc copyright 1986 Digital Equipment Corporation copyright 1990 Motorola Inc copyright 1990 1991 1992 Cornell University copyright 1989 1991 The University of Maryland copyright 1988 Carnegie Mellon University Trademark Notices UNIX is a registered trademark in the United States and other countries licensed exclusively through X Open Company Limited X Window System is a trademark of the Massachusetts Institute of Technology MS DOS and Microsoft are U S registered trademarks of Microsoft Corporation OSF Motif is a trademark of the Open Software Foundation Inc in the U S and other countries Printing History The manual printing date and part num
4. ber indicate its current edition The printing date will change when a new edition is printed Minor changes may be made at reprint without changing the printing date The manual part number will change when extensive changes are made Manual updates may be issued between editions to correct errors or document product changes To ensure that you receive the updated or new editions you should subscribe to the appropriate product support service See your HP sales representative for details First Edition January 1995 HP UX Release 10 0 Technical Addendum to the Shells User s Guide This document describes changes made for the HP UX 10 0 release that affect the Shells User s Guide B1862 90017 Use this document with the Shells User s Guide Note Use the new shell pathname for the examples in the Shells User s Guide the new pathnames are shown in parentheses on the next pages For example for all Bourne shell examples use usr old bin sh For detailed information on the shells refer to the following manpages sh 1 Overview of the shells sh bourne 1 Bourne shell csh 1 C shell ksh 1 Korn shell keysh 1 Key shell sh posiz 1 POSIX shell For additional information Hewlett Packard recommends the following commercial books Kornshell Programming Tutorial Publisher Addison Wesley 1 800 822 6339 UNIX C Shell Field Guide Publisher Prentice Hall U S 515 284 6761 or 515 284 6751 International
5. ere are no new features for the HP UX 10 0 release Key Shell usr bin keysh There are no new features for the HP UX 10 0 release However there are new path names for the following files New Path Name Old Path Name usr 1ib keysh builtins usr keysh builtins usr lib keysh LANG help usr keysh LANG help usr 1ib keysh LANG keyshrc usr keysh LANG keyshrec usr lib keysh LANG softkeys usr keysh LANG softkeys POSIX Shell usr bin sh The POSIX shell is implemented for the HP UX 10 0 release as the new standard shell The POSIX shell replaces the Bourne shell Changes made to the POSIX shell for the HP UX 10 0 release 4 byte EUC support The directory bin posix and file bin posix sh are eliminated The hash command becomes a built in shell command and has the addition of the r option The export p command is fully implemented The built in command type is added The preserved file descriptors 10 and 14 through 20 are moved to the maximum side of the array of available file descriptors Technical Addendum to the 1 3 Shells User s Guide New additional features New built in commands such as alias bg fc fg getopts jobs kill let select unalias and whence The read and print commands have a p option for co processes Addition of the select command New operators such as C gt l and amp Commands preceded by an explanation mark return t
6. he logical negation of the command s exit status New reserved words such as select function and J Aliases can redefine special built in commands Addition of parameter substitutions that were allowed in the Bourne shell Support of a one dimensional array facility Availability of tilde substitutions New parameters set by the POSIX shell Positional parameters are not limited to nine as with the Bourne shell Integer arithmetic can be performed using the let command New input output operators such as gt lt gt lt amp p and gt amp p Values can be assigned in one step using readonly or export Availability of symbolic names for signals and traps An environment variable can be passed to a child process even if it is not exported The for while and until loops are executed in the current process environment Assignments made within loops remain effective after the loop completes Addition of job control commands such as jobs fg and bg to suspend resume and control processes executing in the background In line editing is possible using the vi or emacs editing commands History capability is available for listing and editing command lines 1 4 Technical Addendum to the Shells User s Guide
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