$- with a "c" in it means the shell was invoked with -c. Period. It does not tell you more than that. As you can see $- shows both invocation options, plus any options you set later on, in this example verbose was turned on interactively.
$- reflects BOTH options set at shell invocation and set later on. It is there to let you know what your runtime environment is like, -v for example, changes the way the running script appears to the user.
Ive seen this word being popped up whenever I read the Unix man description of the exec() family of functions. What exactly does it refer to, as I can't seem to comprehend how processes would have an image ?
cheers (1 Reply)
sorry for this silly question, I am new to UNIX,
what is meant by paging space and what is its purpose?
what is also meant by hd6 paging space? (2 Replies)
hi there,
can somebody give me a definition for daemons, or example what are they !!
and what the use for?
i've done some research and all what i found is /etc/...
or /usr/bin/...
and i haven't quietly got the concept.
any ideas !!
Thanks. (5 Replies)
Is FreeBSD and OpenBSD considered Unix? What O.S does Most of the forum members use? How popular are Licensed Unix operating systems for home users?
Additionally I thought Linux was a Minux fork and BSD was a Unix fork.
Thanks in ... (7 Replies)
Hi,
I am trying to create a macro in FTP to rename multiple files.Below given is the codewhich i tried. I wanted to pass the files from the file "$FTPTXRENAMESUCLIST`" to the renfiles macro.
Your help will be really appreciated.
ftp -i -v -n << endftp > $FTPTXLOG 2> $FTPER
open... (0 Replies)
Hi Folks,
I have a script called program.sh which was written by someone. I am supposed to edit it for my necessities.
There is a line in the script that is as follows
if ]; then
echo -e "Option limit should be positive number and less than 1. Program aborts!"
exit 1
... (27 Replies)
A byte is the smallest unit of storage which can be accessed in a computer's memory- either in RAM or ROM.It also holds exactly 8 bits.But its old view one byte was sufficient to hold one 8 bit character.Modern days especially on .NET or international versions of Win 32, 16 bits is needed.
... (2 Replies)
Hi all,
I'm bit new to the advanced bash shell scripting.
When I'm looking at some of the existing code in my organization, got confused with a few variable definings.
For ex:
var1={1:-30}
var2="abc def ghi"
var3={xyz:-$var2}
In above, 1st and last lines are confusing me.... (4 Replies)
I have many headers with huge amount of structures in them, typical one looks like this:
$ cat a.h
struct Rec1 {
int f1;
int f2;
};
struct Rec2 {
char r1;
char r2;
};
struct Rec3 {
int f1;
float k1;
float ... (6 Replies)
Discussion started by: migurus
6 Replies
LEARN ABOUT V7
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)