01-15-2008
Need help passing variables in shell script to perl one-liner
I'm writing a script to automate some post-install tasks on RHEL4 servers.
I need the following code to insert an 'A' in the middle of a string, then replace the string in a file. I know I can use sed to do this, but I'd like to use perl's in place edit so I don't have to write to a temp file, then overwrite the original.
Here's what I have so far:
mystr1=`grep Mlocal submit.cf | cut -d, -f3` #grab the string
mystr2=`echo $mystr1 | awk '{print substr($1,1,7) "A" substr($1,8)}'` #insert the 'A'
perl -i -p -e 's/$mystr1/$mystr2/' submit.cf #search and replace
The variables (mystr1 and mystr2) are not importing into the perl statement. I've tried exporting them with 'typeset -x' and using:
perl -i -p -e 's/$ENV{"mystr1"}/$ENV{"mystr2"}/' submit.cf #search and replace
Which works with:
perl -e 'print $ENV{"mystr2"}'
but not with search and replace
I know the search and replace syntax is correct because the following section of my script to uncomment the alias file works fine:
if [ `grep AliasFile submit.cf | cut -c1` = "#" ]
then
perl -i -p -e "s/#O AliasFile/O AliasFile/" submit.cf
fi
Any help is greatly appreciated.
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LEARN ABOUT DEBIAN
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)