What does the \$$filename do? I don't think I have ever seen this before.
eval is used here to obtain the value of a variable whose name is derived from the value of another variable.
Suppose you have an environment variable FILE1 with the content as in the scenario above:
If you assign the name of the environment variable to the variable like:
filename doesn't have the value "/clocal/data/user/userdata.txt" but just "FILE1".
With the command:
eval expands $filename to FILE1, then the shell expands $FILE1 (hence the escaped $) and assigns the content to the variable $file.
Now the variable $file contains "/clocal/data/user/userdata.txt".
This User Gave Thanks to Franklin52 For This Post:
Can someone send me a shell script to set all Oracle environment variable which is working.
I have the following script which works but not 100%. Please advice what you think is wrong.
if # Command executed from a terminal
then
ORACLE_SID=""
... (4 Replies)
Hi,
I'm exporting an environmental variable from a C program using putenv function. I'm calling the exe of the C program from shell script. But when I display the environmental variables from the Shell script, My varaible is not getting displayed.
Can anyone please tell me how to get it in... (2 Replies)
Hi,
I have problem setting up environmental variables.
The idea is to start with main.ksh script that will run setting.ksh, and in side of it I'll set up variables.
Please take a look at my code, and help me to find my mistake.
Thanks,
Mila
Main.ksh look like this:
#!/usr/bin/ksh
#... (2 Replies)
Hello.
I have a question about how the PATH environment variable works.
I wrote a script in $HOME/bin/gvim.
I want it to be called instead of /usr/bin/gvim,
so I've placed it before in the PATH.
However, it is still the old one that is found.
If I open an other terminal, I have the... (6 Replies)
I am new in unix..
I am running a sql loader script where I have to specify the data file path but the file name contains spaces in it
so giving error multiple arguments
I have tried it with "" and '' but does n't work the command is :
$ORACLE_HOME/bin/sqlldr... (1 Reply)
I have a request from a programmer to set an env variable for him. I know how to do it for bash shell by adding the following line to .bash_profile
export $VAR=/home/code/project/
But this will be applicable only when he is in his bash shell. What is the procedure to be followed to make... (2 Replies)
Hola -
I've got a script for logon which populates a database with some info when a user logs on so that we can tell how many public terminals are in use & show users which ones are free. However, the machines are DHCPed and so using $HOSTNAME gives me an unstable name for them since of course... (3 Replies)
i want to set environmental variables in solaris and redhat.
it should show the current directory and the default shell should be bourne shell. along with it should show the hostname..
like this
hostname{/home/vipin/data}# ifconfig
Thanks in advanced.:wall:
Please use code tags.... (1 Reply)
i set a variable from the command line:
export GANG="james,roy,martin"
i can access this variable ($GANG) from a script. but each time i run the script, the variable keeps getting bigger. more info keeps getting added to it.
Is there anyway i can make the $GANG variable contain the... (3 Replies)
My shell script it.sh.I am calling bip.sh from it.sh
#!/bin/sh
ORACLE_HOME=/var/opt/oracle/product/10g; export ORACLE_HOME
PATH=$PATH:$ORACLE_HOME/bin:/bin:/usr/bin; export PATH
today=`date "+%m-%d-%Y %H:%M:%S"`; export today
CUR_DIR=$1; export CUR_DIR
LOG_FILE=$CUR_DIR/error.log;... (4 Replies)
Discussion started by: rafa_fed2
4 Replies
LEARN ABOUT XFREE86
shift
shift(1) User Commands shift(1)NAME
shift - shell built-in function to traverse either a shell's argument list or a list of field-separated words
SYNOPSIS
sh
shift [n]
csh
shift [variable]
ksh
* shift [n]
DESCRIPTION
sh
The positional parameters from $n+1 ... are renamed $1 ... . If n is not given, it is assumed to be 1.
csh
The components of argv, or variable, if supplied, are shifted to the left, discarding the first component. It is an error for the variable
not to be set or to have a null value.
ksh
The positional parameters from $n+1 $n+1 ... are renamed $1 ..., default n is 1. The parameter n can be any arithmetic expression that
evaluates to a non-negative number less than or equal to $#.
On this man page, ksh(1) commands that are preceded by one or two * (asterisks) are treated specially in the following ways:
1. Variable assignment lists preceding the command remain in effect when the command completes.
2. I/O redirections are processed after variable assignments.
3. Errors cause a script that contains them to abort.
4. Words, following a command preceded by ** that are in the format of a variable assignment, are expanded with the same rules as a vari-
able assignment. This means that tilde substitution is performed after the = sign and word splitting and file name generation are not
performed.
ATTRIBUTES
See attributes(5) for descriptions of the following attributes:
+-----------------------------+-----------------------------+
| ATTRIBUTE TYPE | ATTRIBUTE VALUE |
+-----------------------------+-----------------------------+
|Availability |SUNWcsu |
+-----------------------------+-----------------------------+
SEE ALSO csh(1), ksh(1), sh(1), attributes(5)SunOS 5.10 15 Apr 1994 shift(1)