Variables set within a script cease to exist, or revert to their values before the script was executed, when the script terminates (except, that is, if the script is sourced).
Hi,
I am trying to do an rsh and execute the same script on a distant unix computer.
The problem is that I need to get all the local variables of the distant computer to launch correctly my script.
I'm working on AIX 4.3.3
I try to execute .profile in the rsh but it seems not to be... (1 Reply)
Guys, how can I define global variables in sorlaris...cause I lose the values outside the scope.
Rite now wat I do is,I redirect variable value to a file n then get it back outside the function...:o....theres obviously a better way of doing this...I now this is a basic question....but please... (2 Replies)
In my script I need to list the directory, where the generic name of the files will change, in my test case its set to TEST_*.mqsc. I wrote a small test script as below, but it just does not pip the listing to a file.
Any idea why?
dir='C:/cygwin/var/log/img/aut/'
file=TEST01_*.mqsc
ls $dir... (4 Replies)
(I think this question desearves separate thread..)
I have a problem with 'while'
I am trying to set variables by 'while' and it is fine inside, but after completting the loop all changes are lost:
> bb="kkkk - 111\nlllll - 22222\nbbbb - 4444"
> echo "$bb"
kkkk - 111
lllll - 22222
bbbb -... (3 Replies)
can I use unset to unset all the variables in a shell sciprt?
VAR1=1
VAR2=2
VAR3=3
unset
whether this unset will afftect any system variables?
Thanks, (3 Replies)
Hi All,
Is there any way to check exit status of unset variables?
In the following code PathX is not set and the script terminates without checking exit status.
#!/bin/bash
Path="/tmp/log"
cd ${PathX:?}
if ;then
echo "Exit Status : non zero"
else
echo "Exit Status :... (2 Replies)
As I know threads share the memory. But, what about the local variables in the thread function? if i call multiple threads would they allocate seperate local variables for themselves?
like
thread_func()
{
int i, j;
string...
}
Are the above local variables defined for each of... (1 Reply)
I'm wondering, is the number of variables will affect execution time of my bash script or maybe affect the cpu workload, cpu memory, etc ?
If I create so many variables, should I unset each one of that variables after I used them or after I think they are no longer needed?
and if my script... (2 Replies)
Hello,
I have a file at remote server. I have to select only current day's files that are dropped on ftp server. The files do not have date or timestamp on them.
so I plan to get the file listing from remote server to the local server. Based on file listing date I can find out when the files... (2 Replies)
I have a script to start/stop/restart the tomcat application. When we run the script first time i.e stop/start it set all env variables(DISTRIB_ID,NAME,TOMCAT_CFG,....etc),but when we restart the tomcat it is running in the same shell.....I need to set the variables when i restart the tomcat(in the... (1 Reply)
Discussion started by: praveen265
1 Replies
LEARN ABOUT POSIX
escape
escape(1) Mail Avenger 0.8.3 escape(1)NAME
escape - escape shell special characters in a string
SYNOPSIS
escape string
DESCRIPTION
escape prepends a "" character to all shell special characters in string, making it safe to compose a shell command with the result.
EXAMPLES
The following is a contrived example showing how one can unintentionally end up executing the contents of a string:
$ var='; echo gotcha!'
$ eval echo hi $var
hi
gotcha!
$
Using escape, one can avoid executing the contents of $var:
$ eval echo hi `escape "$var"`
hi ; echo gotcha!
$
A less contrived example is passing arguments to Mail Avenger bodytest commands containing possibly unsafe environment variables. For
example, you might write a hypothetical reject_bcc script to reject mail not explicitly addressed to the recipient:
#!/bin/sh
formail -x to -x cc -x resent-to -x resent-cc
| fgrep "$1" > /dev/null
&& exit 0
echo "<$1>.. address does not accept blind carbon copies"
exit 100
To invoke this script, passing it the recipient address as an argument, you would need to put the following in your Mail Avenger rcpt
script:
bodytest reject_bcc `escape "$RECIPIENT"`
SEE ALSO avenger(1),
The Mail Avenger home page: <http://www.mailavenger.org/>.
BUGS
escape is designed for the Bourne shell, which is what Mail Avenger scripts use. escape might or might not work with other shells.
AUTHOR
David Mazieres
Mail Avenger 0.8.3 2012-04-05 escape(1)