11-06-2007
handling null values in files
Hi ,
I have a script where i will remove header and trailer record and ftp to another server.
I'm using the code:
latestfilename=`ls filename_* | tail -1`
echo "Latest filename = $latestfilename"
sed '1d;$d' $latestfilename > a.ftpedfile
I have an issue if input data is having null values.The data looks like this:
Input record has :00223715232238200 N NULL 1999031920000707 abc *
In place of NULL i have a null.
MY output is :
00223715232238200 N 1999031920000707 abc *
The record is shifted.
Please advice how to transfer null as it is.And also please let me know if i ftp the file with null values the values should not be dropped.
Thanks in advance!
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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)