That code is vulnerable to pattern matching metacharacters. For this approach to work with arbitrary text, it is necessary to double-quote the nested parameter expansion.
A minor nit: You refer to shell pattern matching as regular expressions. I'm sure you know that those are two distinct grammars, but a novice may become confused.
Regards,
Alister
These 2 Users Gave Thanks to alister For This Post:
Hi All,
We are in the process of Migrating from AIX 4 to Solaris 10 and getting a Few Errors.
I have been programming in shell but could never establish muself as an expert, hence please need you help.
I am Getting Bad Substitution error in my script, I have isolated the issue and its... (6 Replies)
hi,
i created a shell script having the following content:
#! /usr/bin/ksh
FROM="myemail@domain.com"
MAILTO="someemail@domain"
SUBJECT="TEST"
BODY="/export/home/adshocker/body.txt"
ATTACH="/export/home/adshocker/attach.prog"
echo $ATTACH
ATTACH_NAME="${ATTACH##*/}"
echo $ATTACH_NAME... (5 Replies)
Hello,
In bash I can use the following:
TMP=12345
MID=${TMP:1:1}
the expected result is: 2
but when using KSH I'm getting a ''bad substitution" error.
What is the correct syntaxin ksh?
Thanks (2 Replies)
#!/bin/bash
a1=( win 12,01,02,03,04 )
a2=( pre 04,05,06 )
a3=( msn 06,07,08,09 )
Given the above arrays, I want the script to return/echo the following in a loop;
win
12,01,02,03,04
pre
04,05,06,07
msn
06,07,08,09
But I can't get it to do as such.
I've tried; (2 Replies)
Hi Gurus,
I am working with a korn shell script. I should replace in a very great file the character ";" with a space.
Example:
2750;~
2734;~
2778;~
2751;~
2751;~
2752;~
what the fastest method is? Sed? Awk?
Speed is dead main point, Seen the dimensions of the files
Thanks (6 Replies)
Hi All,
I'm building a new shell script but i'm facing a problem with one line which is giving "bad substitution" error. Please assist
script lines:
#!/bin/sh
printf "%s: " "Occurrence DATE (YYYYMMDD)"; read DATE
shortdate=${DATE#??}
o/p:
./test1: bad substitution
This command is... (2 Replies)
Why I get bad replace when using eval?
$ map0=( "0" "0000" "0")
$ i=0
$ eval echo \${map$i}
0000
$ a=`eval echo \${map$i}` !!!error happens!!!
bash: ${map$i}: bad substitution
How to resolve it ?
Thanks! (5 Replies)
I have script data.sh which has following error.
Script Name : data.sh
#!/bin/sh
infile=$1
len=${#infile}
echo $len
texfile=${infile:0:$len-4}
echo $texfile
run command
./data.sh acb.xml
I get following error message: (5 Replies)
Hi I'm using ksh.
And i'm trying to get the substring like below.
but giving the following error
#!/bin/ksh
foo=teststring
bar=${foo:0:5}
echo $bar
And the error is
./sbstr_test.sh: bar=${foo:0:5}: bad substitution
what is wrong in this script. Please correct me
... (3 Replies)
Cant undestand :) why i have an error on line 2.it is working on my other boxes
#!/bin/bash
ret=$(echo Q | timeout 5 openssl s_client connect "${1`hostname`}:${2-443}" -ssl3 2> /dev/null)
if echo "${ret}" | grep -q 'Protocol.*SSLv3'; then
if echo "${ret}" | grep -q 'Cipher.*0000'; then
... (7 Replies)
Discussion started by: kenshinhimura
7 Replies
LEARN ABOUT POSIX
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)