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Top Forums Shell Programming and Scripting Question about special variables: "-" and "$_" Post 302405984 by cfajohnson on Sunday 21st of March 2010 08:02:23 AM
Old 03-21-2010
Quote:
Originally Posted by honglus
both ksh/bash support this 2 special variables, Is there any document for reference?

1) "-" is $OLDPWD

$- contains the current shell options.

-, as an argument to cd, returns to the previously active directory.
Quote:
2) "$_" is last argument of previous command.

There are part of all POSIX shells (and the cd command). See the man page for any such shell (the Special Parameters section of the bash man page) or the POSIX specs at Shell and Utilities

Last edited by cfajohnson; 03-21-2010 at 09:08 AM..
 

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MESSAGES(3)						  libbash messages Library Manual					       MESSAGES(3)

NAME
messages -- libbash library that implements a set of functions to print standard status messages SYNOPSIS
printOK [indent] printFAIL [indent] printNA [indent] printATTN [indent] printWAIT [indent] DESCRIPTION
General messages is a collection of functions to print standard status messages - those [ OK ] and [FAIL] messages you see during Linux boot process. The function list: printOK Prints a standard [ OK ] message (green) printFAIL Prints a standard [FAIL] message (red) printNA Prints a standard [ N/A] message (yellow) printATTN Prints a standard [ATTN] message (yellow) printWAIT Prints a standard [WAIT] message (yellow) Detailed interface description follows. indent Column to move to before printing. Default indent is calculated as TTY_WIDTH-10. If current tty width can not be determined (for example, in case of serial console), it defaults to 80, so default indent is 80-10=10 FUNCTIONS DESCRIPTIONS
printOK [indent] Prints a standard [ OK ] message (green) printFAIL [indent] Prints a standard [FAIL] message (red) printNA [indent] Prints a standard [ N/A] message (yellow) printATTN [indent] Prints a standard [ATTN] message (yellow) printWAIT [indent] Prints a standard [WAIT] message (yellow) EXAMPLES
Run a program named MyProg, and report it's success or failure: echo -n 'Running MyProg...' printWAIT if MyProg ; then printOK else printFAIL fi AUTHORS
Hai Zaar <haizaar@haizaar.com> Gil Ran <gil@ran4.net> SEE ALSO
ldbash(1), libbash(1) Linux Epoch Linux
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