while command question Post: 302317321

10 More Discussions You Might Find Interesting

1. UNIX for Dummies Questions & Answers

question about rm command

i have a lot of messages file in the var directory i want to delete now i want to keep messages.1 to messages.10 and then delete everything else after 10 which is like 10 to 96 obviously i cant delete these files individual, can someone tell me the command to delete messages.11 to...

2. UNIX for Dummies Questions & Answers

question about using tr command

Hello all: I'm trying to use the tr command to change some text in a file, but it is not working as expected. Here's what I'm trying: tr 'INVOIC01' 'INVOICZZ' < inputfile > outputfile It looks to be changing not just the entire string, but any characters within. I just want to change the...

3. Solaris

question about command

On Solaris 8 - what is the equal command to chfs. Thanks carson

4. Solaris

cp command Question?

I am trying to following.. cp -rp oradata to /prod1 /prod2 /prod3 How I can copy oradata directory in to multiple directories? Thanks -Ad

5. UNIX for Dummies Questions & Answers

Command Question

What does 'directory=`pwd $1` ' mean, I know pwd is present working directory, so does that command take the present working directory of the directory the user is in depending on the varible ($1)?

6. UNIX for Dummies Questions & Answers

mv Command question

When I use the mv command like say, mv file1 ../, it will move file1 to the parent directory of my current working directory. But where would the file go if I do mv file ... (with 3 periods), where would this move file1?

7. UNIX for Dummies Questions & Answers

Question about why a command does this

$ echo 2 * 3 > 5 is a valid inequality. This will create a file in the current directory named '5' with the number '2' in it, the names of all the files in the current directory, followed by the number '3' and 'is a valid inequality.' What I do not understand is why 'is a valid inequality' gets...

8. UNIX for Dummies Questions & Answers

New to Unix command line and have a question about the "sort" command

I am going through the Unix Made Easy second edition book by John Muster. So far it's been very informative and I can tell it may be a bit out of date. In one of the exercises it talks about the "sort" command and using it to sort column's of data etc. The "sort" command has changed a bit and...

9. UNIX and Linux Applications

Ls command question

I am scratching my head right now. I am trying to archive a ton of files in a directory. I am attempting to tar them by year. On our development server if I type ls *_2008* it returns all of the files I am expecting to see. (The format of the filename includes xx_xx_xxx_2008-09-29_xxx.xxxx.xxxx)...

10. Shell Programming and Scripting

Question on command

Hi, can you please tell me what is the purpose of the following line: sh -c /home/dir/script.sh || exit 33 what i am confused is the || is this an OR boolean, or it might have some other purpose. do you know how this works ? i believe the first to run is the /home/dir/script.sh but what...

LEARN ABOUT POSIX

true

TRUE(1P)						     POSIX Programmer's Manual							  TRUE(1P)

PROLOG

       This  manual page is part of the POSIX Programmer's Manual.  The Linux implementation of this interface may differ (consult the correspond-
       ing Linux manual page for details of Linux behavior), or the interface may not be implemented on Linux.

NAME

       true -- return true value

SYNOPSIS

       true

DESCRIPTION

       The true utility shall return with exit code zero.

OPTIONS

       None.

OPERANDS

       None.

STDIN

       Not used.

INPUT FILES

       None.

ENVIRONMENT VARIABLES

       None.

ASYNCHRONOUS EVENTS

       Default.

STDOUT

       Not used.

STDERR

       Not used.

OUTPUT FILES

       None.

EXTENDED DESCRIPTION

       None.

EXIT STATUS

       Zero.

CONSEQUENCES OF ERRORS

       None.

       The following sections are informative.

APPLICATION USAGE

       This utility is typically used in shell scripts, as shown in the EXAMPLES section. The special built-in utility : is sometimes  more  effi-
       cient than true.

EXAMPLES

       This command is executed forever:

	   while true
	   do
	       command
	   done

RATIONALE

       The true utility has been retained in this volume of POSIX.1-2008, even though the shell special built-in : provides similar functionality,
       because true is widely used in historical scripts and is less cryptic to novice script readers.

FUTURE DIRECTIONS

       None.

SEE ALSO

       Section 2.9, Shell Commands, false

COPYRIGHT

       Portions of this text are reprinted and reproduced in electronic form from IEEE Std 1003.1, 2013 Edition, Standard for Information Technol-
       ogy  --	Portable  Operating  System  Interface (POSIX), The Open Group Base Specifications Issue 7, Copyright (C) 2013 by the Institute of
       Electrical and Electronics Engineers, Inc and The Open Group.  (This is POSIX.1-2008 with the 2013 Technical Corrigendum 1 applied.) In the
       event of any discrepancy between this version and the original IEEE and The Open Group Standard, the original IEEE and The Open Group Stan-
       dard is the referee document. The original Standard can be obtained online at http://www.unix.org/online.html .

       Any typographical or formatting errors that appear in this page are most likely to have been introduced during the conversion of the source
       files to man page format. To report such errors, see https://www.kernel.org/doc/man-pages/reporting_bugs.html .

IEEE
/The Open Group						       2013								  TRUE(1P)

10 More Discussions You Might Find Interesting

1. UNIX for Dummies Questions & Answers

question about rm command

Discussion started by: IMPTRUE

2. UNIX for Dummies Questions & Answers

question about using tr command

Discussion started by: merliech

3. Solaris

question about command

Discussion started by: cmackin

4. Solaris

cp command Question?

Discussion started by: deal732