Does the rm command throw an error when ${vra} does not exist or does it simply proceed with a null byte or something followed by /* erasing everything in its path.
As a beginner in Linux / Bash everything seems to bring up a question.
This has been answered many times before. If the variable vra has not been defined, the command:
will invoke rm with one operand for every file in your system's root directory that does not start with a period. The rm command will then attempt to remove every file in the file hierarchies rooted in those pathnames and print a diagnostic message for every file it is unable to remove until you kill that command or wipe out your system.
UNIX and Linux system utilities are generally very happy to try to do whatever you tell them to even if you have told them to do something that could be disastrous. They don't generally try to second guess you and tell you you might be making a mistake.
Sir,
I using the following commands in a file (part of a bigger script):
#!/bin/bash
cd /opt/oracle/bin
ls -lt | tail -1 | awk '{print $6}' >> /tmp/ramb.out
If I run this from the command prompt the result is:
2007-05-16
if I run it as a cron job then... (5 Replies)
Hi everybody!
We have to upgrade serviceguard 11.14 to 11.16, so I get PHSS_36898 patch from HP.
Is it necessary to uninstall serviceguard 11.14 before install this patch? (I think so, but i am not sure).
Do you know if is "dangerous" this kind of upgrade? Any suggestions about?
Thx in... (1 Reply)
Hi ,
I have a piece of code ...wherein I need to assign the following ...
1) A command line argument to a variable
e.g origCount=ARGV
2) A unix command to a variable
e.g result=`wc -l testFile.txt`
in my awk shell script
When I do this :
print "origCount" origCount --> I get the... (0 Replies)
AIX:Command to get netaddress/subnet address command in IPv4/IP6
Can anybody help us with a command to retrieve netaddress/subnet address command in IPv4/IP6 on aix machine.
net/subnet address is in the format 172.16.212.0(signifies all 255 machines in an IPv4 network) (2 Replies)
I had a umount busy issue, that the usual fuser -mk did not solve, I did a umount -l and was able to unmount the device, I then got in trouble by the storage team staff:
Here was a snippet of their response:
Using "umount -l" is a potentially dangerous act.
The command combination for a lazy... (8 Replies)
Hi everyone,
when executing this command in unix:
echo "WM7 Fatal Alerts:", $(cat query1.txt) > a.csvIt works fine, but running this command in a shell script gives an error saying that there's a syntax error.
here is content of my script:
tdbsrvr$ vi hc.sh
"hc.sh" 22 lines, 509... (4 Replies)
Hello,
I have a Application which needs to run shell scripts in a elevated state (root) for system interrogation. So I execute each script using bash -C. This has worked really well.
I now want to add another layer of security, I cant inspect each of the scripts before they get deployed to the... (4 Replies)
HI Guys,
I hope you are well. I am trying to write a script that gets executed every time i open a shell (cshell). I have two questions about that
1) I need to enter these commands
$ echo $DISPLAY
$ setenv $DISPLAY output_of_echo_$display_command
How can i write a... (2 Replies)
Discussion started by: kaaliakahn
2 Replies
LEARN ABOUT OSX
rake
RAKE(1) Ruby Programmers Reference Guide RAKE(1)NAME
rake -- Ruby Make
SYNOPSIS
rake [--f Rakefile] [--version] [-CGNPgnqstv] [-D [PATTERN]] [-E CODE] [-I LIBDIR] [-R RAKELIBDIR] [-T [PATTERN]] [-e CODE] [-p CODE]
[-r MODULE] [--rules] [variable=value] target ...
DESCRIPTION
Rake is a simple ruby(1) build program with capabilities similar to the regular make(1) command.
Rake has the following features:
o Rakefiles (Rake's version of Makefiles) are completely defined in standard Ruby syntax. No XML files to edit. No quirky Makefile syntax
to worry about (is that a tab or a space?).
o Users can specify tasks with prerequisites.
o Rake supports rule patterns to synthesize implicit tasks.
o Flexible FileLists that act like arrays but know about manipulating file names and paths.
o A library of prepackaged tasks to make building rakefiles easier.
OPTIONS --version Display the program version.
-C
--classic-namespace
Put Task and FileTask in the top level namespace
-D [PATTERN]
--describe [PATTERN]
Describe the tasks (matching optional PATTERN), then exit.
-E CODE
--execute-continue CODE
Execute some Ruby code, then continue with normal task processing.
-G
--no-system
--nosystem Use standard project Rakefile search paths, ignore system wide rakefiles.
-I LIBDIR
--libdir LIBDIR Include LIBDIR in the search path for required modules.
-N
--no-search
--nosearch Do not search parent directories for the Rakefile.
-P
--prereqs Display the tasks and dependencies, then exit.
-R RAKELIBDIR
--rakelib RAKELIBDIR
--rakelibdir RAKELIBDIR
Auto-import any .rake files in RAKELIBDIR. (default is rakelib )
-T [PATTERN]
--tasks [PATTERN] Display the tasks (matching optional PATTERN) with descriptions, then exit.
-e CODE
--execute CODE Execute some Ruby code and exit.
-f FILE
--rakefile FILE Use FILE as the rakefile.
-h
--help Prints a summary of options.
-g
--system Using system wide (global) rakefiles (usually ~/.rake/*.rake ).
-n
--dry-run Do a dry run without executing actions.
-p CODE
--execute-print CODE
Execute some Ruby code, print the result, then exit.
-q
--quiet Do not log messages to standard output.
-r MODULE
--require MODULE Require MODULE before executing rakefile.
-s
--silent Like --quiet, but also suppresses the 'in directory' announcement.
-t
--trace Turn on invoke/execute tracing, enable full backtrace.
-v
--verbose Log message to standard output (default).
--rules Trace the rules resolution.
SEE ALSO ruby(1)make(1)
http://rake.rubyforge.org/
REPORTING BUGS
Bugs, features requests and other issues can be logged at <http://onestepback.org/redmine/projects/show/rake>.
You will need an account to before you can post issues. Register at <http://onestepback.org/redmine/account/register>. Or you can send an
email to the author.
AUTHOR
Rake is written by Jim Weirich <jim@weirichhouse.org>
UNIX November 7, 2012 UNIX