If $back_home is not defined then the command cd ${back_home} would evaluate to just cd (since "back_home" would evaluate to nothing). This would indeed take you "back home" (as in to your home directory - since cd with no arguments is equivalent to cd $HOME).
If you want to test if a variable is defined, you should use the test command!
hi ..
I have automate some process on unix through sehll script .
but i don't know there is some problem in scripts, some time shell script works and some time it fails. so my query is that "Why shell script fails some times?"
thanks (4 Replies)
hi ,
i m trying to run a shell script automatically , some time it works fine but some time it fails , what could be the problem .
If anybody have an idea about this problem then reply .
Thanks in advacne (4 Replies)
Guys any tips on printing a certain error message to stderr and exiting should a command fail within a ksh script? I'm trying to null some output files.
Touch isn't suitable as i need to null them.
print "" > file isn't suitable as i need to check elsehere for if they are 0bytes or not.
... (5 Replies)
Hi All,
I am stuch in a script where a for loop is running to execute some commands for some values.
Now my problem is i have to have an if condition that if the first iteration is successful then it has to exit the for loop otherwise it has to continue normally.
my code is this:
for... (5 Replies)
OS Environment: HP-UX B.11.31 U ia64
I am using the shell script code to connect to Oracle RAC database.
Passing the parameter of cluster database name.
typeset -l DB_ID=$1
+ typeset -l DB_ID=sivDB
#---- 3. SetDB validation -------------
if ; then
print... (3 Replies)
HI
My doubt may be basic one but I need to get it clarified..
When i use "if" condition that checks for many AND, OR logical conditions
like
if ]; then
return 0
fi
Even the if condition fails it returns as zero.. Any clue..
But if i add else condition like
if ]; ... (2 Replies)
Hi,
I am writing a menu driven program using shell script. THe script will be collecting data by logging into the other servers and bringing back the data to home server to process it and accordingly issue commands. TO automate commands execution , I am using expect script. However I am not able... (5 Replies)
Hi,
i am new here let me say HI for all.
now i have a question please:
i am sending one command to my machine to create 3 names.
if one of the names exists then the box return error message that already have the name but will continue to create the rests.
How i can break the command and... (7 Replies)
I have a sample server name listed in variable as below:
var="server-13"
I need to check if the 7th character on $var is number 1
whichenv=`echo "$var"| head -c 7 | tail -c 1`
if ]; then
echo "9 found"
else
echo "9 Not Found"
fi
Output:
This works... (3 Replies)
Discussion started by: mohtashims
3 Replies
LEARN ABOUT DEBIAN
perlconsole
PERLCONSOLE(1p) User Contributed Perl Documentation PERLCONSOLE(1p)NAME
perlconsole - light program that lets you evaluate Perl code interactively.
COPYRIGHT
Perl Console is Copyright (C) 2007 by Alexis Sukrieh
DESCRIPTION
Perl Console is a small program that implements a Read-eval-print loop: it lets you evaluate Perl code interactively.
It uses Readline to grab input, and provides completion with all the namespaces loaded during your session. It allows you to load a module
in your session and test a function exported by it.
COMMANDS
It's possible to interact with the console with internal commands. The following commands are supported in this version:
:help display the interactive help screen
:quit quit the console
:set set a preference (see PREFERENCES).
RCFILE
PerlConsole will look for a rcfile located in your home directory called: ~/.perlconsolerc
Every line in that file will be evaluated as if they were issued in the console. You can then load there your favorite modules, or even
define your preferences.
Example of a valid ~/.perlconsolerc
:set output = dumper
use Date::Calc;
PREFERENCES
Preferences can be set with the :set command. The following preferences are supported in this version:
output changes the output of evaluated code
For details about commands, ype :help <command> within the console.
AUTHOR
Perl Console was writen by Alexis Sukrieh <sukria@sukria.net>.
perl v5.12.4 2011-09-18 PERLCONSOLE(1p)