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 DEBIAN
test
TEST(1) User Commands TEST(1)NAME
test - check file types and compare values
SYNOPSIS
test EXPRESSION
test
[ EXPRESSION ]
[ ]
[ OPTION
DESCRIPTION
Exit with the status determined by EXPRESSION.
--help display this help and exit
--version
output version information and exit
An omitted EXPRESSION defaults to false. Otherwise, EXPRESSION is true or false and sets exit status. It is one of:
( EXPRESSION )
EXPRESSION is true
! EXPRESSION
EXPRESSION is false
EXPRESSION1 -a EXPRESSION2
both EXPRESSION1 and EXPRESSION2 are true
EXPRESSION1 -o EXPRESSION2
either EXPRESSION1 or EXPRESSION2 is true
-n STRING
the length of STRING is nonzero
STRING equivalent to -n STRING
-z STRING
the length of STRING is zero
STRING1 = STRING2
the strings are equal
STRING1 != STRING2
the strings are not equal
INTEGER1 -eq INTEGER2
INTEGER1 is equal to INTEGER2
INTEGER1 -ge INTEGER2
INTEGER1 is greater than or equal to INTEGER2
INTEGER1 -gt INTEGER2
INTEGER1 is greater than INTEGER2
INTEGER1 -le INTEGER2
INTEGER1 is less than or equal to INTEGER2
INTEGER1 -lt INTEGER2
INTEGER1 is less than INTEGER2
INTEGER1 -ne INTEGER2
INTEGER1 is not equal to INTEGER2
FILE1 -ef FILE2
FILE1 and FILE2 have the same device and inode numbers
FILE1 -nt FILE2
FILE1 is newer (modification date) than FILE2
FILE1 -ot FILE2
FILE1 is older than FILE2
-b FILE
FILE exists and is block special
-c FILE
FILE exists and is character special
-d FILE
FILE exists and is a directory
-e FILE
FILE exists
-f FILE
FILE exists and is a regular file
-g FILE
FILE exists and is set-group-ID
-G FILE
FILE exists and is owned by the effective group ID
-h FILE
FILE exists and is a symbolic link (same as -L)
-k FILE
FILE exists and has its sticky bit set
-L FILE
FILE exists and is a symbolic link (same as -h)
-O FILE
FILE exists and is owned by the effective user ID
-p FILE
FILE exists and is a named pipe
-r FILE
FILE exists and read permission is granted
-s FILE
FILE exists and has a size greater than zero
-S FILE
FILE exists and is a socket
-t FD file descriptor FD is opened on a terminal
-u FILE
FILE exists and its set-user-ID bit is set
-w FILE
FILE exists and write permission is granted
-x FILE
FILE exists and execute (or search) permission is granted
Except for -h and -L, all FILE-related tests dereference symbolic links. Beware that parentheses need to be escaped (e.g., by backslashes)
for shells. INTEGER may also be -l STRING, which evaluates to the length of STRING.
NOTE: [ honors the --help and --version options, but test does not. test treats each of those as it treats any other nonempty STRING.
NOTE: your shell may have its own version of test and/or [, which usually supersedes the version described here. Please refer to your
shell's documentation for details about the options it supports.
AUTHOR
Written by Kevin Braunsdorf and Matthew Bradburn.
REPORTING BUGS
Report test bugs to bug-coreutils@gnu.org
GNU coreutils home page: <http://www.gnu.org/software/coreutils/>
General help using GNU software: <http://www.gnu.org/gethelp/>
Report test translation bugs to <http://translationproject.org/team/>
COPYRIGHT
Copyright (C) 2011 Free Software Foundation, Inc. License GPLv3+: GNU GPL version 3 or later <http://gnu.org/licenses/gpl.html>.
This is free software: you are free to change and redistribute it. There is NO WARRANTY, to the extent permitted by law.
SEE ALSO
The full documentation for test is maintained as a Texinfo manual. If the info and test programs are properly installed at your site, the
command
info coreutils 'test invocation'
should give you access to the complete manual.
GNU coreutils 8.12.197-032bb September 2011 TEST(1)