OK, the title is a little vague, but basically i was gonig through some files and ran into some strange syntax... heres what it looks like:
... 1&>~/<file extension>
where ... is a chain of commands (the 1&>~ is part of the arguments) and the file extension is just a pointer to a file... (1 Reply)
can anyone explain the code for me... i am new to shell programming
while getopts ":S:D:U:" OPTION "$@"
do
case $OPTION in
S) SRVR=$OPTARG;;
D) DB="$OPTARG"; USEDB="use $OPTARG";;
U) UID=$OPTARG;;
:) MISSINGOPTARG="$MISSINGOPTARG -$OPTARG";;
?) if
then
... (2 Replies)
IN the book below example showed
find /home/tolstoy -type d -print | Find all directories
sed 's;/home/tolstoy/;/home/lt/;' | Change name, note use of semicolon delimiter
while read newdir Read new directory name
do
mkdir $newdir ... (7 Replies)
I know that I want to entirely replace line 3 in my file filename.txt. I have tried all sorts of variations of
sed 3,3,c\replacement stuff\ filename.txt with no success.
about the only thing that causes any reaction is
sed 3,3c\\ filename.txt
but it just prints out the whole file.
... (13 Replies)
Hi everyone,
I got some code here that I've been working on, but I've gotten stuck. I cant figure out what is wrong with the syntax.
sub cksum{
my $uint32_t = \buffer;
my $word_count;
my $bias;
(
#uint32_t checksum = $bias
$word_count = $bias
while ($word_count>=0)
... (2 Replies)
hi!
pls help me :)
cd folder
for f in *; do
...
done
this circle takes all files from folder1
i need only .pdf files
but it may be like a.pdf or a.PDF
what syntax must i use?
smth like it:
cd folder
for f in *.(pdf|PDF); do (2 Replies)
Hi all,
I'm trying to decrypt a GnuPG file but not having much luck. I'm new to using it and have tried 4 different ways to do it but nothing works. Here are examples of the attempts I have made:
gpg -o ./file_name.tar.Z --passphrase-fd 0 ./file_name.tar.Z.gpg 0<./password.txt
cat... (5 Replies)
Query with perl syntax
Aim: is to change a perl script to use a new file
I was required to replace
- entries \"$entries\"
with
-lib <full_path_to_filename>
So in the code detector.pm
sub rundetector
{
my $class = shift;
mkdir($resultDirectory);
my... (3 Replies)
Discussion started by: sa@@
3 Replies
LEARN ABOUT CENTOS
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)