Quick question related to KSH expressions (not unix regular expressions).
I am trying to craft a pattern that will correctly identify lines that match the following CSV text in a case statement:
filename.txt, filename.txt, alpha, nnnn, nnnn, nnnn, Free form text
Originally I simply used... (4 Replies)
Hi,
How can I check numeric value in shell?
I am passing one parameter (integer) and I want to restrict any other characters except 0-9.
./script xyz 10
Here 2nd parameter (10) should be integer only.
Can anyone help on this?
Malay (6 Replies)
How could I check if a string variable contains at least (or only) 2 characters, and check and make sure that the string does not contain any numeric digits?...I need to know how to do this as simple as possible. and I am using the Ksh shell. Thanks. (1 Reply)
How could I check if a numeric variable has 5 digits in KSH...I have a zipcode variable that I know will always be 5 digits, and I want to print out an error if it is less or more than 5 digits the problem is that I have it as:
if ]
but this won't work because the statement doesn't see 0001 as... (3 Replies)
How would I go about getting the previous date on the server? I'm out of ideas...I am thinking that I could do it using the date command, but I am unable to find any information on doing it. For example if the current date is April 17th 2008 it would be (20080417) <- (YYYYMMDD). I need the previous... (4 Replies)
hi all,
i have a shell (ksh) script where i am reading line by line from a grep command and i wanted to check if the grep command actually returned something or was null. i can do this by using -z :
if ; then .....
but this forces me to do something when $myVariable is null when i... (3 Replies)
I'm trying to test and see whether a variable that is being extracted from a line in a file is numeric or not. I have tried everything that I can think of and I cannot figure out how to get it to work. I am trying to test and see if the string extracted contains 5 numeric digits. This is what I... (8 Replies)
Hi, I'm trying to check to see that the arguments given to my script are both numeric and positive integers. I'm using tcsh. I figured out the positive part, but I am having trouble with the arguments being numeric and integers
I have no idea where to get started with the checking them actually... (1 Reply)
I am trying to test to see if the hostname of the computer I'm on starts with ne1dxdb - it can contain any characters after that. I have the following code, but it's not working - it's not falling into the if statement. Any ideas?
boxname="unknown"
function get_hosttype {
... (4 Replies)
To check a bash script syntax without executing it we use:
bash -n scriptname
What should be the equivalent command for checking a ksh script? (8 Replies)
Discussion started by: proactiveaditya
8 Replies
LEARN ABOUT FREEBSD
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)