06-16-2008
How to use sed for string manipulation
Hi,
I would like to know How to use use sed for manipulating string for the following situation.
Basically my objective is to check validity of the filename in my shell script.
I am getting a parameter like this for my shell script.
Check my folder is having some space.
$1=/root/krishna mohan/file.txt
I am trying to use sed so that I can mutate the above file path like below and further use ls command.
/root/'krishna mohan'/file.txt
ls /root/'krishna mohan'/file.txt
Ofcourse I do know that I can use single quote in the begining and end.But I will have problems if I am getting above parameter with some mask/pattern like
/root/krishna mohan/file*.txt
Here keeping single quotes in the begining and end won't work.
Kindly suggest me the solution How to keep quotes for any text between / and / which has space.
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LEARN ABOUT MOJAVE
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)