04-14-2008
I have thought about it too but my skill in Bourne shell is limited and I could not figure out how I can do it. I have the following codes on my mind but I could not code something that is good enough to prevent the unwanted special characters from being entered by user:
# This will prevent user from entering /, _ & - which should be allowed
echo $b | grep "[^0-9]" > /dev/null 2>&1
if [ "$?" -eq "0" ]; then
echo "ERROR: Invalid Directory!"
fi
# This will prevent user from entering /, _ & - which should be allowed
echo $b | grep "[^a-z]" > /dev/null 2>&1
if [ "$?" -eq "0" ]; then
echo "ERROR: Invalid Directory!"
fi
# This will prevent user from entering /, _ & - which should be allowed
echo $b | grep "[^A-Z]" > /dev/null 2>&1
if [ "$?" -eq "0" ]; then
echo "ERROR: Invalid Directory!"
fi
10 More Discussions You Might Find Interesting
1. Shell Programming and Scripting
I am struggling with the following sample code:
array1=(a b c d)
array2=(* * * *)
print ${array1}
print ${array2}
It returns 'c' and the name of a file in the directory I'm in.
I can't for the life of me work out how to prevent the shell interpreting the '*' and just get it to return... (2 Replies)
Discussion started by: Doug97
2 Replies
2. Shell Programming and Scripting
He guys.
Basically I want to make a script that can add, delete and view stuff in a external file called config.txt. I can open it up in Joe but im not sure how to read in the user input or using commands automatically in joe to edit, save then quit.
Problem area below:
1) echo "Add... (1 Reply)
Discussion started by: Pits
1 Replies
3. UNIX for Dummies Questions & Answers
Hi,
I would like to display the following message from my shell (Korn) script
Copy "old_file.txt" to "new_file.txt"
My code looks as follows
print "Copy "old_file.txt" to "new_file.txt""
However, when I execute the script, I get the following output
Copy old_file.txt to... (6 Replies)
Discussion started by: rogers42
6 Replies
4. Shell Programming and Scripting
Hi Forum.
I've tried to search online for a solution but I cannot seem to find one.
Hopefully, someone here can help me out. I would appreciate it.
Input file abc.txt:
$InputFile_Borrower=CMTSLST\EDW_COMMERCIAL_MTGE_BORROWER_dat.lst... (14 Replies)
Discussion started by: pchang
14 Replies
5. Shell Programming and Scripting
Hey Everyone,
I'm quite new to unix (hence the 0 posts!) and im trying to write a simple program that outputs what the user types in to the screen, as long as it is a letter.
This part works fine, however, when a "\" is entered doesnt not display anything and moves to the next line. Is... (11 Replies)
Discussion started by: ultiron
11 Replies
6. Shell Programming and Scripting
Hi,
I am trying to replace a string in shell but it is not working correctly.
@xcom.file@
needs to be replaced with
tb137
Plz help.Thx.
Please use and tags when posting code, data or logs etc. to preserve formatting and enhance readability, thanks. (4 Replies)
Discussion started by: manish72
4 Replies
7. Shell Programming and Scripting
I made menu script for users so they can run other script without going in shell just from menu.
But i must control their input.
These are criteria:
Input must have 4 signs
First two signs are always lower case letters
Input shall not have some special signs just letters and numbers
... (1 Reply)
Discussion started by: waso
1 Replies
8. Shell Programming and Scripting
i need to replace the any special characters with escape characters like below.
test!=123-> test\!\=123
!@#$%^&*()-= to be replaced by
\!\@\#\$\%\^\&\*\(\)\-\= (8 Replies)
Discussion started by: laknar
8 Replies
9. Shell Programming and Scripting
How to match a shell variable that contains parenthesis (and other special characters like "!")
file.txt contains:
Charles Dickens
Matthew Lewis (writer)
name="Matthew Lewis (writer)";
awk -v na="$name" ' $0 ~ na' file.txt
Ideally this would match $name in file.txt (in this... (3 Replies)
Discussion started by: Mid Ocean
3 Replies
10. Shell Programming and Scripting
Hi All, I am a newbie to Shell scripting. I have a requirement to Delimit the file fields of a Input file having special characters and spaces with ";".
Input File
----------------------------------
Server Port
----------------------------------
Local ... (5 Replies)
Discussion started by: Suganbabu
5 Replies
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)