09-11-2002
Change this line in your code from:
echo "$var" | grep [^a-zA-Z0-9] >/dev/null
to:
echo "$var" | grep "[:alnum]\{4\}">/dev/null
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1. Shell Programming and Scripting
Hi,
I have trouble with quotations of the M4 preprocessor.
I want to write a basic makro that removes all spaces and newlines at the end and at the beginning of a string.
I tried this:
define(`TRIM_END', `patsubst(`$1', `\(\\n\| \)*$', `')')
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Discussion started by: hindman
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2. Shell Programming and Scripting
Can someone explain the following? I can use find on *.pm without quotes, but find on *.pl makes on error, I need quotes for the second version. What's up with that?
$find -name *.pm
./tieProxyStatus/Status.pm
$find -name *.pl
find: paths must precede expression
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3. Shell Programming and Scripting
can somebody help, what quote i should use in below statement or what wrong of it ?
the 1st (*) is a char, the 2nd and 3rd (*) is a wildcard
if ] && ] && ]
................^ .............^
then
echo "ok"
fi
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4. Shell Programming and Scripting
The block below isn't a surprise:$ ls
file1 file2 file3
$ x=*
$ echo $x
file1 file2 file3
$ echo '$x'
$x
$ echo "$x"
*
$But I found this block a bit bewildering:$ echo $x'
>'
*
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5. Shell Programming and Scripting
hi guys, i have a question related to quoting but i am not sure how to formulate it...
lets say we want to simulate the following shell actions
cd ~/project-dir
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buidtags.sh
... (2 Replies)
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(no, i can't switch shells, although i'd love to. yes, i have read http://www.grymoire.com/Unix/CshTop10.txt.)
i finally managed to get an alias working the way i want it to, but i don't understand how one part of it works (highlighted in red):
alias log ' \\
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7. Shell Programming and Scripting
I have this data how do i add ' ' to them like '-AAL00L' , '-BBE4577' , 'ABC'
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8. Shell Programming and Scripting
Hi,
I have got a file comp_data containing the below data :
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I am at a loss on this one. I am trying to run this command on a bunch of (OS 10.7.4) macs:osascript -e "tell application \"System Events\" to return name of every process whose frontmost is true"
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10. Shell Programming and Scripting
I am trying to write a BASH script that will prompt a user to enter a number of days, then calculate the date.
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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)